1044 lines
35 KiB
C
1044 lines
35 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Emulation of the IBM PCjr.
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*
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*
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*
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* Authors: Sarah Walker, <https://pcem-emulator.co.uk/>
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* Miran Grca, <mgrca8@gmail.com>
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* Fred N. van Kempen, <decwiz@yahoo.com>
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*
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* Copyright 2008-2019 Sarah Walker.
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* Copyright 2016-2019 Miran Grca.
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* Copyright 2017-2019 Fred N. van Kempen.
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*/
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <wchar.h>
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#define HAVE_STDARG_H
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#include <86box/86box.h>
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#include "cpu.h"
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#include <86box/timer.h>
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#include <86box/device.h>
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#include <86box/cassette.h>
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#include <86box/io.h>
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#include <86box/nmi.h>
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#include <86box/pic.h>
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#include <86box/pit.h>
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#include <86box/mem.h>
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#include <86box/device.h>
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#include <86box/gameport.h>
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#include <86box/serial.h>
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#include <86box/keyboard.h>
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#include <86box/rom.h>
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#include <86box/fdd.h>
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#include <86box/fdc.h>
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#include <86box/sound.h>
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#include <86box/snd_speaker.h>
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#include <86box/snd_sn76489.h>
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#include <86box/video.h>
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#include <86box/vid_cga_comp.h>
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#include <86box/machine.h>
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#include <86box/plat_unused.h>
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#define PCJR_RGB 0
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#define PCJR_COMPOSITE 1
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#define STAT_PARITY 0x80
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#define STAT_RTIMEOUT 0x40
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#define STAT_TTIMEOUT 0x20
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#define STAT_LOCK 0x10
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#define STAT_CD 0x08
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#define STAT_SYSFLAG 0x04
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#define STAT_IFULL 0x02
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#define STAT_OFULL 0x01
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typedef struct pcjr_t {
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/* Video Controller stuff. */
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mem_mapping_t mapping;
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uint8_t crtc[32];
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int crtcreg;
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int array_index;
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uint8_t array[32];
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int array_ff;
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int memctrl;
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uint8_t stat;
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int addr_mode;
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uint8_t *vram;
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uint8_t *b8000;
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int linepos;
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int displine;
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int sc;
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int vc;
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int dispon;
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int con;
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int coff;
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int cursoron;
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int blink;
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int vsynctime;
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int fullchange;
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int vadj;
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uint16_t ma;
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uint16_t maback;
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uint64_t dispontime;
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uint64_t dispofftime;
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pc_timer_t timer;
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int firstline;
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int lastline;
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int composite;
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/* Keyboard Controller stuff. */
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int latched;
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int data;
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int serial_data[44];
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int serial_pos;
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uint8_t pa;
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uint8_t pb;
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pc_timer_t send_delay_timer;
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} pcjr_t;
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static video_timings_t timing_dram = { VIDEO_BUS, 0, 0, 0, 0, 0, 0 }; /*No additional waitstates*/
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static uint8_t crtcmask[32] = {
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0xff, 0xff, 0xff, 0xff, 0x7f, 0x1f, 0x7f, 0x7f,
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0xf3, 0x1f, 0x7f, 0x1f, 0x3f, 0xff, 0x3f, 0xff,
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0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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static uint8_t key_queue[16];
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static int key_queue_start = 0;
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static int key_queue_end = 0;
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static void
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recalc_address(pcjr_t *pcjr)
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{
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uint8_t masked_memctrl = pcjr->memctrl;
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/* According to the Technical Reference, bits 2 and 5 are
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ignored if there is only 64k of RAM and there are only
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4 pages. */
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if (mem_size < 128)
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masked_memctrl &= ~0x24;
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if ((pcjr->memctrl & 0xc0) == 0xc0) {
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pcjr->vram = &ram[(masked_memctrl & 0x06) << 14];
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pcjr->b8000 = &ram[(masked_memctrl & 0x30) << 11];
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} else {
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pcjr->vram = &ram[(masked_memctrl & 0x07) << 14];
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pcjr->b8000 = &ram[(masked_memctrl & 0x38) << 11];
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}
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}
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static void
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recalc_timings(pcjr_t *pcjr)
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{
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double _dispontime;
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double _dispofftime;
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double disptime;
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if (pcjr->array[0] & 1) {
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disptime = pcjr->crtc[0] + 1;
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_dispontime = pcjr->crtc[1];
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} else {
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disptime = (pcjr->crtc[0] + 1) << 1;
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_dispontime = pcjr->crtc[1] << 1;
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}
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_dispofftime = disptime - _dispontime;
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_dispontime *= CGACONST;
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_dispofftime *= CGACONST;
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pcjr->dispontime = (uint64_t) (_dispontime);
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pcjr->dispofftime = (uint64_t) (_dispofftime);
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}
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static int
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vid_get_h_overscan_size(pcjr_t *pcjr)
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{
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int ret;
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if (pcjr->array[0] & 1)
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ret = 128;
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else
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ret = 256;
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return ret;
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}
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static void
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vid_out(uint16_t addr, uint8_t val, void *priv)
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{
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pcjr_t *pcjr = (pcjr_t *) priv;
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uint8_t old;
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switch (addr) {
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case 0x3d0:
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case 0x3d2:
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case 0x3d4:
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case 0x3d6:
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pcjr->crtcreg = val & 0x1f;
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return;
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case 0x3d1:
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case 0x3d3:
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case 0x3d5:
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case 0x3d7:
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old = pcjr->crtc[pcjr->crtcreg];
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pcjr->crtc[pcjr->crtcreg] = val & crtcmask[pcjr->crtcreg];
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if (pcjr->crtcreg == 2)
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overscan_x = vid_get_h_overscan_size(pcjr);
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if (old != val) {
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if (pcjr->crtcreg < 0xe || pcjr->crtcreg > 0x10) {
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pcjr->fullchange = changeframecount;
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recalc_timings(pcjr);
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}
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}
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return;
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case 0x3da:
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if (!pcjr->array_ff)
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pcjr->array_index = val & 0x1f;
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else {
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if (pcjr->array_index & 0x10)
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val &= 0x0f;
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pcjr->array[pcjr->array_index & 0x1f] = val;
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if (!(pcjr->array_index & 0x1f))
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update_cga16_color(val);
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}
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pcjr->array_ff = !pcjr->array_ff;
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break;
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case 0x3df:
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pcjr->memctrl = val;
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pcjr->pa = val; /* The PCjr BIOS expects the value written to 3DF to
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then be readable from port 60, others it errors out
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with only 64k RAM set (but somehow, still works with
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128k or more RAM). */
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pcjr->addr_mode = val >> 6;
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recalc_address(pcjr);
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break;
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default:
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break;
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}
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}
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static uint8_t
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vid_in(uint16_t addr, void *priv)
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{
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pcjr_t *pcjr = (pcjr_t *) priv;
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uint8_t ret = 0xff;
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switch (addr) {
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case 0x3d0:
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case 0x3d2:
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case 0x3d4:
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case 0x3d6:
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ret = pcjr->crtcreg;
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break;
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case 0x3d1:
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case 0x3d3:
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case 0x3d5:
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case 0x3d7:
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ret = pcjr->crtc[pcjr->crtcreg];
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break;
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case 0x3da:
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pcjr->array_ff = 0;
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pcjr->stat ^= 0x10;
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ret = pcjr->stat;
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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vid_write(uint32_t addr, uint8_t val, void *priv)
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{
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pcjr_t *pcjr = (pcjr_t *) priv;
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if (pcjr->memctrl == -1)
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return;
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pcjr->b8000[addr & 0x3fff] = val;
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}
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static uint8_t
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vid_read(uint32_t addr, void *priv)
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{
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const pcjr_t *pcjr = (pcjr_t *) priv;
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if (pcjr->memctrl == -1)
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return 0xff;
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return (pcjr->b8000[addr & 0x3fff]);
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}
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static int
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vid_get_h_overscan_delta(pcjr_t *pcjr)
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{
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int def;
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int coef;
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int ret;
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switch ((pcjr->array[0] & 0x13) | ((pcjr->array[3] & 0x08) << 5)) {
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case 0x13: /*320x200x16*/
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def = 0x56;
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coef = 8;
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break;
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case 0x12: /*160x200x16*/
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def = 0x2b;
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coef = 16;
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break;
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case 0x03: /*640x200x4*/
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def = 0x56;
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coef = 8;
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break;
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case 0x01: /*80 column text*/
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def = 0x5a;
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coef = 8;
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break;
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case 0x00: /*40 column text*/
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default:
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def = 0x2c;
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coef = 16;
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break;
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case 0x02: /*320x200x4*/
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def = 0x2b;
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coef = 16;
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break;
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case 0x102: /*640x200x2*/
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def = 0x2b;
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coef = 16;
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break;
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}
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ret = pcjr->crtc[0x02] - def;
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if (ret < -8)
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ret = -8;
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if (ret > 8)
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ret = 8;
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return ret * coef;
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}
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static void
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vid_blit_h_overscan(pcjr_t *pcjr)
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{
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int cols;
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int i;
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int x;
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int y = (pcjr->lastline << 1) + 16;
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int ho_s = vid_get_h_overscan_size(pcjr);
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if (pcjr->dispon)
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cols = (pcjr->array[2] & 0xf) + 16;
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else {
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if (pcjr->array[3] & 4)
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cols = (pcjr->array[2] & 0xf) + 16;
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else
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cols = pcjr->array[0 + 16] + 16;
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}
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if (pcjr->array[0] & 1)
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x = (pcjr->crtc[1] << 3) + ho_s;
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else
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x = (pcjr->crtc[1] << 4) + ho_s;
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for (i = 0; i < 16; i++) {
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hline(buffer32, 0, i, x, cols);
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hline(buffer32, 0, y + i, x, cols);
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if (pcjr->composite) {
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Composite_Process(pcjr->array[0], 0, x >> 2, buffer32->line[i]);
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Composite_Process(pcjr->array[0], 0, x >> 2, buffer32->line[y + i]);
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} else {
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video_process_8(x, i);
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video_process_8(x, y + i);
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}
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}
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}
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static void
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vid_poll(void *priv)
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{
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pcjr_t *pcjr = (pcjr_t *) priv;
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uint16_t ca = (pcjr->crtc[15] | (pcjr->crtc[14] << 8)) & 0x3fff;
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int drawcursor;
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int x;
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int xs_temp;
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int ys_temp;
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int oldvc;
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uint8_t chr;
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uint8_t attr;
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uint16_t dat;
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int cols[4];
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int oldsc;
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int l = (pcjr->displine << 1) + 16;
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int ho_s = vid_get_h_overscan_size(pcjr);
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int ho_d = vid_get_h_overscan_delta(pcjr) + (ho_s / 2);
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if (!pcjr->linepos) {
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timer_advance_u64(&pcjr->timer, pcjr->dispofftime);
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pcjr->stat &= ~1;
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pcjr->linepos = 1;
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oldsc = pcjr->sc;
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if ((pcjr->crtc[8] & 3) == 3)
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pcjr->sc = (pcjr->sc << 1) & 7;
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if (pcjr->dispon) {
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uint16_t offset = 0;
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uint16_t mask = 0x1fff;
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if (pcjr->displine < pcjr->firstline) {
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pcjr->firstline = pcjr->displine;
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video_wait_for_buffer();
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}
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pcjr->lastline = pcjr->displine;
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cols[0] = (pcjr->array[2] & 0xf) + 16;
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if (pcjr->array[0] & 1) {
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hline(buffer32, 0, l, (pcjr->crtc[1] << 3) + ho_s, cols[0]);
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hline(buffer32, 0, l + 1, (pcjr->crtc[1] << 3) + ho_s, cols[0]);
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} else {
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hline(buffer32, 0, l, (pcjr->crtc[1] << 4) + ho_s, cols[0]);
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hline(buffer32, 0, l + 1, (pcjr->crtc[1] << 4) + ho_s, cols[0]);
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}
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switch (pcjr->addr_mode) {
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case 0: /*Alpha*/
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offset = 0;
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mask = 0x3fff;
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break;
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case 1: /*Low resolution graphics*/
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offset = (pcjr->sc & 1) * 0x2000;
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break;
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case 3: /*High resolution graphics*/
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offset = (pcjr->sc & 3) * 0x2000;
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break;
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default:
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break;
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}
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switch ((pcjr->array[0] & 0x13) | ((pcjr->array[3] & 0x08) << 5)) {
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case 0x13: /*320x200x16*/
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for (x = 0; x < pcjr->crtc[1]; x++) {
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int ef_x = (x << 3) + ho_d;
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dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
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pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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pcjr->ma++;
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buffer32->line[l][ef_x] = buffer32->line[l][ef_x + 1] =
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buffer32->line[l + 1][ef_x] = buffer32->line[l + 1][ef_x + 1] =
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pcjr->array[((dat >> 12) & pcjr->array[1] & 0x0f) + 16] + 16;
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buffer32->line[l][ef_x + 2] = buffer32->line[l][ef_x + 3] =
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buffer32->line[l + 1][ef_x + 2] = buffer32->line[l + 1][ef_x + 3] =
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pcjr->array[((dat >> 8) & pcjr->array[1] & 0x0f) + 16] + 16;
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buffer32->line[l][ef_x + 4] = buffer32->line[l][ef_x + 5] =
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buffer32->line[l + 1][ef_x + 4] = buffer32->line[l + 1][ef_x + 5] =
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pcjr->array[((dat >> 4) & pcjr->array[1] & 0x0f) + 16] + 16;
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buffer32->line[l][ef_x + 6] = buffer32->line[l][ef_x + 7] =
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buffer32->line[l + 1][ef_x + 6] = buffer32->line[l + 1][ef_x + 7] =
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pcjr->array[(dat & pcjr->array[1] & 0x0f) + 16] + 16;
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}
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break;
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case 0x12: /*160x200x16*/
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for (x = 0; x < pcjr->crtc[1]; x++) {
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int ef_x = (x << 4) + ho_d;
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dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
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pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
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pcjr->ma++;
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buffer32->line[l][ef_x] = buffer32->line[l][ef_x + 1] =
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buffer32->line[l][ef_x + 2] = buffer32->line[l][ef_x + 3] =
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buffer32->line[l + 1][ef_x] = buffer32->line[l + 1][ef_x + 1] =
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buffer32->line[l + 1][ef_x + 2] = buffer32->line[l + 1][ef_x + 3] =
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pcjr->array[((dat >> 12) & pcjr->array[1] & 0x0f) + 16] + 16;
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buffer32->line[l][ef_x + 4] = buffer32->line[l][ef_x + 5] =
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buffer32->line[l][ef_x + 6] = buffer32->line[l][ef_x + 7] =
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buffer32->line[l + 1][ef_x + 4] = buffer32->line[l + 1][ef_x + 5] =
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buffer32->line[l + 1][ef_x + 6] = buffer32->line[l + 1][ef_x + 7] =
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pcjr->array[((dat >> 8) & pcjr->array[1] & 0x0f) + 16] + 16;
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buffer32->line[l][ef_x + 8] = buffer32->line[l][ef_x + 9] =
|
|
buffer32->line[l][ef_x + 10] = buffer32->line[l][ef_x + 11] =
|
|
buffer32->line[l + 1][ef_x + 8] = buffer32->line[l + 1][ef_x + 9] =
|
|
buffer32->line[l + 1][ef_x + 10] = buffer32->line[l + 1][ef_x + 11] =
|
|
pcjr->array[((dat >> 4) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
buffer32->line[l][ef_x + 12] = buffer32->line[l][ef_x + 13] =
|
|
buffer32->line[l][ef_x + 14] = buffer32->line[l][ef_x + 15] =
|
|
buffer32->line[l + 1][ef_x + 12] = buffer32->line[l + 1][ef_x + 13] =
|
|
buffer32->line[l + 1][ef_x + 14] = buffer32->line[l + 1][ef_x + 15] =
|
|
pcjr->array[(dat & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
}
|
|
break;
|
|
case 0x03: /*640x200x4*/
|
|
for (x = 0; x < pcjr->crtc[1]; x++) {
|
|
int ef_x = (x << 3) + ho_d;
|
|
dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1] << 8) |
|
|
pcjr->vram[((pcjr->ma << 1) & mask) + offset];
|
|
pcjr->ma++;
|
|
for (uint8_t c = 0; c < 8; c++) {
|
|
chr = (dat >> 7) & 1;
|
|
chr |= ((dat >> 14) & 2);
|
|
buffer32->line[l][ef_x + c] = buffer32->line[l + 1][ef_x + c] =
|
|
pcjr->array[(chr & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
dat <<= 1;
|
|
}
|
|
}
|
|
break;
|
|
case 0x01: /*80 column text*/
|
|
for (x = 0; x < pcjr->crtc[1]; x++) {
|
|
int ef_x = (x << 3) + ho_d;
|
|
chr = pcjr->vram[((pcjr->ma << 1) & mask) + offset];
|
|
attr = pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
|
|
drawcursor = ((pcjr->ma == ca) && pcjr->con && pcjr->cursoron);
|
|
if (pcjr->array[3] & 4) {
|
|
cols[1] = pcjr->array[((attr & 15) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
cols[0] = pcjr->array[(((attr >> 4) & 7) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
if ((pcjr->blink & 16) && (attr & 0x80) && !drawcursor)
|
|
cols[1] = cols[0];
|
|
} else {
|
|
cols[1] = pcjr->array[((attr & 15) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
cols[0] = pcjr->array[((attr >> 4) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
}
|
|
if (pcjr->sc & 8)
|
|
for (uint8_t c = 0; c < 8; c++)
|
|
buffer32->line[l][ef_x + c] =
|
|
buffer32->line[l + 1][ef_x + c] = cols[0];
|
|
else
|
|
for (uint8_t c = 0; c < 8; c++)
|
|
buffer32->line[l][ef_x + c] =
|
|
buffer32->line[l + 1][ef_x + c] =
|
|
cols[(fontdat[chr][pcjr->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
|
|
if (drawcursor)
|
|
for (uint8_t c = 0; c < 8; c++) {
|
|
buffer32->line[l][ef_x + c] ^= 15;
|
|
buffer32->line[l + 1][ef_x + c] ^= 15;
|
|
}
|
|
pcjr->ma++;
|
|
}
|
|
break;
|
|
case 0x00: /*40 column text*/
|
|
for (x = 0; x < pcjr->crtc[1]; x++) {
|
|
int ef_x = (x << 4) + ho_d;
|
|
chr = pcjr->vram[((pcjr->ma << 1) & mask) + offset];
|
|
attr = pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
|
|
drawcursor = ((pcjr->ma == ca) && pcjr->con && pcjr->cursoron);
|
|
if (pcjr->array[3] & 4) {
|
|
cols[1] = pcjr->array[((attr & 15) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
cols[0] = pcjr->array[(((attr >> 4) & 7) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
if ((pcjr->blink & 16) && (attr & 0x80) && !drawcursor)
|
|
cols[1] = cols[0];
|
|
} else {
|
|
cols[1] = pcjr->array[((attr & 15) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
cols[0] = pcjr->array[((attr >> 4) & pcjr->array[1] & 0x0f) + 16] + 16;
|
|
}
|
|
pcjr->ma++;
|
|
if (pcjr->sc & 8)
|
|
for (uint8_t c = 0; c < 8; c++)
|
|
buffer32->line[l][ef_x + (c << 1)] =
|
|
buffer32->line[l][ef_x + (c << 1) + 1] =
|
|
buffer32->line[l + 1][ef_x + (c << 1)] =
|
|
buffer32->line[l + 1][ef_x + (c << 1) + 1] = cols[0];
|
|
else
|
|
for (uint8_t c = 0; c < 8; c++)
|
|
buffer32->line[l][ef_x + (c << 1)] =
|
|
buffer32->line[l][ef_x + (c << 1) + 1] =
|
|
buffer32->line[l + 1][ef_x + (c << 1)] =
|
|
buffer32->line[l + 1][ef_x + (c << 1) + 1] =
|
|
cols[(fontdat[chr][pcjr->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
|
|
if (drawcursor)
|
|
for (uint8_t c = 0; c < 16; c++) {
|
|
buffer32->line[l][ef_x + c] ^= 15;
|
|
buffer32->line[l + 1][ef_x + c] ^= 15;
|
|
}
|
|
}
|
|
break;
|
|
case 0x02: /*320x200x4*/
|
|
cols[0] = pcjr->array[0 + 16] + 16;
|
|
cols[1] = pcjr->array[1 + 16] + 16;
|
|
cols[2] = pcjr->array[2 + 16] + 16;
|
|
cols[3] = pcjr->array[3 + 16] + 16;
|
|
for (x = 0; x < pcjr->crtc[1]; x++) {
|
|
int ef_x = (x << 4) + ho_d;
|
|
dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
|
|
pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
|
|
pcjr->ma++;
|
|
for (uint8_t c = 0; c < 8; c++) {
|
|
buffer32->line[l][ef_x + (c << 1)] =
|
|
buffer32->line[l][ef_x + (c << 1) + 1] =
|
|
buffer32->line[l + 1][ef_x + (c << 1)] =
|
|
buffer32->line[l + 1][ef_x + (c << 1) + 1] = cols[dat >> 14];
|
|
dat <<= 2;
|
|
}
|
|
}
|
|
break;
|
|
case 0x102: /*640x200x2*/
|
|
cols[0] = pcjr->array[0 + 16] + 16;
|
|
cols[1] = pcjr->array[1 + 16] + 16;
|
|
for (x = 0; x < pcjr->crtc[1]; x++) {
|
|
int ef_x = (x << 4) + ho_d;
|
|
dat = (pcjr->vram[((pcjr->ma << 1) & mask) + offset] << 8) |
|
|
pcjr->vram[((pcjr->ma << 1) & mask) + offset + 1];
|
|
pcjr->ma++;
|
|
for (uint8_t c = 0; c < 16; c++) {
|
|
buffer32->line[l][ef_x + c] = buffer32->line[l + 1][ef_x + c] =
|
|
cols[dat >> 15];
|
|
dat <<= 1;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
} else {
|
|
if (pcjr->array[3] & 4) {
|
|
if (pcjr->array[0] & 1) {
|
|
hline(buffer32, 0, l, (pcjr->crtc[1] << 3) + ho_s, (pcjr->array[2] & 0xf) + 16);
|
|
hline(buffer32, 0, l + 1, (pcjr->crtc[1] << 3) + ho_s, (pcjr->array[2] & 0xf) + 16);
|
|
} else {
|
|
hline(buffer32, 0, l, (pcjr->crtc[1] << 4) + ho_s, (pcjr->array[2] & 0xf) + 16);
|
|
hline(buffer32, 0, l + 1, (pcjr->crtc[1] << 4) + ho_s, (pcjr->array[2] & 0xf) + 16);
|
|
}
|
|
} else {
|
|
cols[0] = pcjr->array[0 + 16] + 16;
|
|
if (pcjr->array[0] & 1) {
|
|
hline(buffer32, 0, l, (pcjr->crtc[1] << 3) + ho_s, cols[0]);
|
|
hline(buffer32, 0, l + 1, (pcjr->crtc[1] << 3) + ho_s, cols[0]);
|
|
} else {
|
|
hline(buffer32, 0, l, (pcjr->crtc[1] << 4) + ho_s, cols[0]);
|
|
hline(buffer32, 0, l + 1, (pcjr->crtc[1] << 4) + ho_s, cols[0]);
|
|
}
|
|
}
|
|
}
|
|
if (pcjr->array[0] & 1)
|
|
x = (pcjr->crtc[1] << 3) + ho_s;
|
|
else
|
|
x = (pcjr->crtc[1] << 4) + ho_s;
|
|
if (pcjr->composite) {
|
|
Composite_Process(pcjr->array[0], 0, x >> 2, buffer32->line[l]);
|
|
Composite_Process(pcjr->array[0], 0, x >> 2, buffer32->line[l + 1]);
|
|
} else {
|
|
video_process_8(x, l);
|
|
video_process_8(x, l + 1);
|
|
}
|
|
pcjr->sc = oldsc;
|
|
if (pcjr->vc == pcjr->crtc[7] && !pcjr->sc) {
|
|
pcjr->stat |= 8;
|
|
}
|
|
pcjr->displine++;
|
|
if (pcjr->displine >= 360)
|
|
pcjr->displine = 0;
|
|
} else {
|
|
timer_advance_u64(&pcjr->timer, pcjr->dispontime);
|
|
if (pcjr->dispon)
|
|
pcjr->stat |= 1;
|
|
pcjr->linepos = 0;
|
|
if (pcjr->vsynctime) {
|
|
pcjr->vsynctime--;
|
|
if (!pcjr->vsynctime) {
|
|
pcjr->stat &= ~8;
|
|
}
|
|
}
|
|
if (pcjr->sc == (pcjr->crtc[11] & 31) || ((pcjr->crtc[8] & 3) == 3 && pcjr->sc == ((pcjr->crtc[11] & 31) >> 1))) {
|
|
pcjr->con = 0;
|
|
pcjr->coff = 1;
|
|
}
|
|
if (pcjr->vadj) {
|
|
pcjr->sc++;
|
|
pcjr->sc &= 31;
|
|
pcjr->ma = pcjr->maback;
|
|
pcjr->vadj--;
|
|
if (!pcjr->vadj) {
|
|
pcjr->dispon = 1;
|
|
pcjr->ma = pcjr->maback = (pcjr->crtc[13] | (pcjr->crtc[12] << 8)) & 0x3fff;
|
|
pcjr->sc = 0;
|
|
}
|
|
} else if (pcjr->sc == pcjr->crtc[9] || ((pcjr->crtc[8] & 3) == 3 && pcjr->sc == (pcjr->crtc[9] >> 1))) {
|
|
pcjr->maback = pcjr->ma;
|
|
pcjr->sc = 0;
|
|
oldvc = pcjr->vc;
|
|
pcjr->vc++;
|
|
pcjr->vc &= 127;
|
|
if (pcjr->vc == pcjr->crtc[6])
|
|
pcjr->dispon = 0;
|
|
if (oldvc == pcjr->crtc[4]) {
|
|
pcjr->vc = 0;
|
|
pcjr->vadj = pcjr->crtc[5];
|
|
if (!pcjr->vadj)
|
|
pcjr->dispon = 1;
|
|
if (!pcjr->vadj)
|
|
pcjr->ma = pcjr->maback = (pcjr->crtc[13] | (pcjr->crtc[12] << 8)) & 0x3fff;
|
|
if ((pcjr->crtc[10] & 0x60) == 0x20)
|
|
pcjr->cursoron = 0;
|
|
else
|
|
pcjr->cursoron = pcjr->blink & 16;
|
|
}
|
|
if (pcjr->vc == pcjr->crtc[7]) {
|
|
pcjr->dispon = 0;
|
|
pcjr->displine = 0;
|
|
pcjr->vsynctime = 16;
|
|
picint(1 << 5);
|
|
if (pcjr->crtc[7]) {
|
|
if (pcjr->array[0] & 1)
|
|
x = (pcjr->crtc[1] << 3) + ho_s;
|
|
else
|
|
x = (pcjr->crtc[1] << 4) + ho_s;
|
|
pcjr->lastline++;
|
|
|
|
xs_temp = x;
|
|
ys_temp = (pcjr->lastline - pcjr->firstline) << 1;
|
|
|
|
if ((xs_temp > 0) && (ys_temp > 0)) {
|
|
int actual_ys = ys_temp;
|
|
|
|
if (xs_temp < 64)
|
|
xs_temp = 656;
|
|
if (ys_temp < 32)
|
|
ys_temp = 400;
|
|
if (!enable_overscan)
|
|
xs_temp -= ho_s;
|
|
|
|
if ((xs_temp != xsize) || (ys_temp != ysize) || video_force_resize_get()) {
|
|
xsize = xs_temp;
|
|
ysize = ys_temp;
|
|
|
|
set_screen_size(xsize, ysize + (enable_overscan ? 32 : 0));
|
|
|
|
if (video_force_resize_get())
|
|
video_force_resize_set(0);
|
|
}
|
|
|
|
vid_blit_h_overscan(pcjr);
|
|
|
|
if (enable_overscan) {
|
|
video_blit_memtoscreen(0, pcjr->firstline << 1,
|
|
xsize, actual_ys + 32);
|
|
} else {
|
|
video_blit_memtoscreen(ho_s / 2, (pcjr->firstline << 1) + 16,
|
|
xsize, actual_ys);
|
|
}
|
|
}
|
|
|
|
frames++;
|
|
video_res_x = xsize;
|
|
video_res_y = ysize;
|
|
}
|
|
pcjr->firstline = 1000;
|
|
pcjr->lastline = 0;
|
|
pcjr->blink++;
|
|
}
|
|
} else {
|
|
pcjr->sc++;
|
|
pcjr->sc &= 31;
|
|
pcjr->ma = pcjr->maback;
|
|
}
|
|
if (pcjr->sc == (pcjr->crtc[10] & 31) || ((pcjr->crtc[8] & 3) == 3 && pcjr->sc == ((pcjr->crtc[10] & 31) >> 1)))
|
|
pcjr->con = 1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
kbd_write(uint16_t port, uint8_t val, void *priv)
|
|
{
|
|
pcjr_t *pcjr = (pcjr_t *) priv;
|
|
|
|
if ((port >= 0xa0) && (port <= 0xa7))
|
|
port = 0xa0;
|
|
|
|
switch (port) {
|
|
case 0x60:
|
|
pcjr->pa = val;
|
|
break;
|
|
|
|
case 0x61:
|
|
pcjr->pb = val;
|
|
|
|
if (cassette != NULL)
|
|
pc_cas_set_motor(cassette, (pcjr->pb & 0x08) == 0);
|
|
|
|
speaker_update();
|
|
speaker_gated = val & 1;
|
|
speaker_enable = val & 2;
|
|
if (speaker_enable)
|
|
was_speaker_enable = 1;
|
|
pit_devs[0].set_gate(pit_devs[0].data, 2, val & 1);
|
|
sn76489_mute = speaker_mute = 1;
|
|
switch (val & 0x60) {
|
|
case 0x00:
|
|
speaker_mute = 0;
|
|
break;
|
|
|
|
case 0x60:
|
|
sn76489_mute = 0;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case 0xa0:
|
|
nmi_mask = val & 0x80;
|
|
pit_devs[0].set_using_timer(pit_devs[0].data, 1, !(val & 0x20));
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static uint8_t
|
|
kbd_read(uint16_t port, void *priv)
|
|
{
|
|
pcjr_t *pcjr = (pcjr_t *) priv;
|
|
uint8_t ret = 0xff;
|
|
|
|
if ((port >= 0xa0) && (port <= 0xa7))
|
|
port = 0xa0;
|
|
|
|
switch (port) {
|
|
case 0x60:
|
|
ret = pcjr->pa;
|
|
break;
|
|
|
|
case 0x61:
|
|
ret = pcjr->pb;
|
|
break;
|
|
|
|
case 0x62:
|
|
ret = (pcjr->latched ? 1 : 0);
|
|
ret |= 0x02; /* Modem card not installed */
|
|
if (mem_size < 128)
|
|
ret |= 0x08; /* 64k expansion card not installed */
|
|
if ((pcjr->pb & 0x08) || (cassette == NULL))
|
|
ret |= (ppispeakon ? 0x10 : 0);
|
|
else
|
|
ret |= (pc_cas_get_inp(cassette) ? 0x10 : 0);
|
|
ret |= (ppispeakon ? 0x10 : 0);
|
|
ret |= (ppispeakon ? 0x20 : 0);
|
|
ret |= (pcjr->data ? 0x40 : 0);
|
|
if (pcjr->data)
|
|
ret |= 0x40;
|
|
break;
|
|
|
|
case 0xa0:
|
|
pcjr->latched = 0;
|
|
ret = 0;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
kbd_poll(void *priv)
|
|
{
|
|
pcjr_t *pcjr = (pcjr_t *) priv;
|
|
int c;
|
|
int p = 0;
|
|
int key;
|
|
|
|
timer_advance_u64(&pcjr->send_delay_timer, 220 * TIMER_USEC);
|
|
|
|
if (key_queue_start != key_queue_end && !pcjr->serial_pos && !pcjr->latched) {
|
|
key = key_queue[key_queue_start];
|
|
|
|
key_queue_start = (key_queue_start + 1) & 0xf;
|
|
|
|
pcjr->latched = 1;
|
|
pcjr->serial_data[0] = 1; /*Start bit*/
|
|
pcjr->serial_data[1] = 0;
|
|
|
|
for (c = 0; c < 8; c++) {
|
|
if (key & (1 << c)) {
|
|
pcjr->serial_data[(c + 1) * 2] = 1;
|
|
pcjr->serial_data[(c + 1) * 2 + 1] = 0;
|
|
p++;
|
|
} else {
|
|
pcjr->serial_data[(c + 1) * 2] = 0;
|
|
pcjr->serial_data[(c + 1) * 2 + 1] = 1;
|
|
}
|
|
}
|
|
|
|
if (p & 1) { /*Parity*/
|
|
pcjr->serial_data[9 * 2] = 1;
|
|
pcjr->serial_data[9 * 2 + 1] = 0;
|
|
} else {
|
|
pcjr->serial_data[9 * 2] = 0;
|
|
pcjr->serial_data[9 * 2 + 1] = 1;
|
|
}
|
|
|
|
for (c = 0; c < 11; c++) { /*11 stop bits*/
|
|
pcjr->serial_data[(c + 10) * 2] = 0;
|
|
pcjr->serial_data[(c + 10) * 2 + 1] = 0;
|
|
}
|
|
|
|
pcjr->serial_pos++;
|
|
}
|
|
|
|
if (pcjr->serial_pos) {
|
|
pcjr->data = pcjr->serial_data[pcjr->serial_pos - 1];
|
|
nmi = pcjr->data;
|
|
pcjr->serial_pos++;
|
|
if (pcjr->serial_pos == 42 + 1)
|
|
pcjr->serial_pos = 0;
|
|
}
|
|
}
|
|
|
|
static void
|
|
kbd_adddata(uint16_t val)
|
|
{
|
|
key_queue[key_queue_end] = val;
|
|
key_queue_end = (key_queue_end + 1) & 0xf;
|
|
}
|
|
|
|
static void
|
|
kbd_adddata_ex(uint16_t val)
|
|
{
|
|
kbd_adddata_process(val, kbd_adddata);
|
|
}
|
|
|
|
static void
|
|
speed_changed(void *priv)
|
|
{
|
|
pcjr_t *pcjr = (pcjr_t *) priv;
|
|
|
|
recalc_timings(pcjr);
|
|
}
|
|
|
|
void
|
|
pit_irq0_timer_pcjr(int new_out, int old_out, UNUSED(void *priv))
|
|
{
|
|
if (new_out && !old_out) {
|
|
picint(1);
|
|
pit_devs[0].ctr_clock(pit_devs[0].data, 1);
|
|
}
|
|
|
|
if (!new_out)
|
|
picintc(1);
|
|
}
|
|
|
|
static const device_config_t pcjr_config[] = {
|
|
// clang-format off
|
|
{
|
|
.name = "display_type",
|
|
.description = "Display type",
|
|
.type = CONFIG_SELECTION,
|
|
.default_string = "",
|
|
.default_int = PCJR_RGB,
|
|
.file_filter = "",
|
|
.spinner = { 0 },
|
|
.selection = {
|
|
{ .description = "RGB", .value = PCJR_RGB },
|
|
{ .description = "Composite", .value = PCJR_COMPOSITE },
|
|
{ .description = "" }
|
|
}
|
|
},
|
|
{ .name = "", .description = "", .type = CONFIG_END }
|
|
// clang-format on
|
|
};
|
|
|
|
const device_t pcjr_device = {
|
|
.name = "IBM PCjr",
|
|
.internal_name = "pcjr",
|
|
.flags = 0,
|
|
.local = 0,
|
|
.init = NULL,
|
|
.close = NULL,
|
|
.reset = NULL,
|
|
{ .available = NULL },
|
|
.speed_changed = speed_changed,
|
|
.force_redraw = NULL,
|
|
.config = pcjr_config
|
|
};
|
|
|
|
int
|
|
machine_pcjr_init(UNUSED(const machine_t *model))
|
|
{
|
|
int display_type;
|
|
pcjr_t *pcjr;
|
|
|
|
int ret;
|
|
|
|
ret = bios_load_linear("roms/machines/ibmpcjr/bios.rom",
|
|
0x000f0000, 65536, 0);
|
|
|
|
if (bios_only || !ret)
|
|
return ret;
|
|
|
|
pcjr = malloc(sizeof(pcjr_t));
|
|
memset(pcjr, 0x00, sizeof(pcjr_t));
|
|
pcjr->memctrl = -1;
|
|
if (mem_size < 128)
|
|
pcjr->memctrl &= ~0x24;
|
|
display_type = machine_get_config_int("display_type");
|
|
pcjr->composite = (display_type != PCJR_RGB);
|
|
overscan_x = 256;
|
|
overscan_y = 32;
|
|
|
|
pic_init_pcjr();
|
|
pit_common_init(0, pit_irq0_timer_pcjr, NULL);
|
|
|
|
cpu_set();
|
|
|
|
/* Initialize the video controller. */
|
|
video_reset(gfxcard[0]);
|
|
loadfont("roms/video/mda/mda.rom", 0);
|
|
mem_mapping_add(&pcjr->mapping, 0xb8000, 0x08000,
|
|
vid_read, NULL, NULL,
|
|
vid_write, NULL, NULL, NULL, 0, pcjr);
|
|
io_sethandler(0x03d0, 16,
|
|
vid_in, NULL, NULL, vid_out, NULL, NULL, pcjr);
|
|
timer_add(&pcjr->timer, vid_poll, pcjr, 1);
|
|
video_inform(VIDEO_FLAG_TYPE_CGA, &timing_dram);
|
|
device_add_ex(&pcjr_device, pcjr);
|
|
cga_palette = 0;
|
|
cgapal_rebuild();
|
|
|
|
/* Initialize the keyboard. */
|
|
keyboard_scan = 1;
|
|
key_queue_start = key_queue_end = 0;
|
|
io_sethandler(0x0060, 4,
|
|
kbd_read, NULL, NULL, kbd_write, NULL, NULL, pcjr);
|
|
io_sethandler(0x00a0, 8,
|
|
kbd_read, NULL, NULL, kbd_write, NULL, NULL, pcjr);
|
|
timer_add(&pcjr->send_delay_timer, kbd_poll, pcjr, 1);
|
|
keyboard_set_table(scancode_xt);
|
|
keyboard_send = kbd_adddata_ex;
|
|
|
|
/* Technically it's the SN76496N, but the SN76489 is identical to the SN76496N. */
|
|
device_add(&sn76489_device);
|
|
|
|
nmi_mask = 0x80;
|
|
|
|
device_add(&fdc_pcjr_device);
|
|
|
|
device_add(&ns8250_pcjr_device);
|
|
serial_set_next_inst(SERIAL_MAX); /* So that serial_standalone_init() won't do anything. */
|
|
|
|
/* "All the inputs are 'read' with one 'IN' from address hex 201." - PCjr Technical Reference (Nov. 83), p.2-119
|
|
|
|
Note by Miran Grca: Meanwhile, the same Technical Reference clearly says that
|
|
the gameport is on ports 201-207. */
|
|
standalone_gameport_type = &gameport_201_device;
|
|
|
|
return ret;
|
|
}
|