f6612fb33b
A lot of clean ups from waltje; Start of a directory structure for the code, thanks to waltje.
700 lines
34 KiB
C
700 lines
34 KiB
C
/* Copyright holders: Sarah Walker
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see COPYING for more details
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*/
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#include <stdlib.h>
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#include <math.h>
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#include "../ibm.h"
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#include "../io.h"
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#include "../mem.h"
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#include "../timer.h"
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#include "../device.h"
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#include "video.h"
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#include "vid_tandysl.h"
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typedef struct tandysl_t
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{
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mem_mapping_t mapping;
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mem_mapping_t ram_mapping;
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mem_mapping_t vram_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 memctrl;
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uint32_t base;
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uint8_t mode, col;
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uint8_t stat;
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uint8_t *vram, *b8000;
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uint32_t b8000_limit;
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uint8_t planar_ctrl;
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int linepos, displine;
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int sc, vc;
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int dispon;
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int con, coff, cursoron, blink;
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int vsynctime, vadj;
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uint16_t ma, maback;
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int dispontime, dispofftime;
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int vidtime;
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int firstline, lastline;
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} tandysl_t;
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static uint8_t crtcmask[32] =
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{
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0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xf3, 0x1f, 0x7f, 0x1f, 0x3f, 0xff, 0x3f, 0xff,
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0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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static void tandysl_recalcaddress(tandysl_t *tandy);
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static void tandysl_recalctimings(tandysl_t *tandy);
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static void tandysl_recalcmapping(tandysl_t *tandy);
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static uint8_t tandysl_in(uint16_t addr, void *p);
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static void tandysl_ram_write(uint32_t addr, uint8_t val, void *p);
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static void tandysl_write(uint32_t addr, uint8_t val, void *p);
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static void tandysl_out(uint16_t addr, uint8_t val, void *p)
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{
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tandysl_t *tandy = (tandysl_t *)p;
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uint8_t old;
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switch (addr)
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{
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case 0x3d4:
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tandy->crtcreg = val & 0x1f;
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return;
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case 0x3d5:
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old = tandy->crtc[tandy->crtcreg];
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tandy->crtc[tandy->crtcreg] = val & crtcmask[tandy->crtcreg];
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if (old != val)
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{
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if (tandy->crtcreg < 0xe || tandy->crtcreg > 0x10)
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{
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fullchange = changeframecount;
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tandysl_recalctimings(tandy);
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}
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}
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return;
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case 0x3d8:
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tandy->mode = val;
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return;
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case 0x3d9:
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tandy->col = val;
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return;
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case 0x3da:
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tandy->array_index = val & 0x1f;
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break;
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case 0x3de:
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if (tandy->array_index & 16)
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val &= 0xf;
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tandy->array[tandy->array_index & 0x1f] = val;
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if ((tandy->array_index & 0x1f) == 5)
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{
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tandysl_recalcmapping(tandy);
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tandysl_recalcaddress(tandy);
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}
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break;
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case 0x3df:
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tandy->memctrl = val;
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tandysl_recalcaddress(tandy);
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break;
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case 0x65:
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if (val == 8) /*Hack*/
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return;
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tandy->planar_ctrl = val;
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tandysl_recalcmapping(tandy);
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break;
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case 0xffe8:
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if ((val & 0xe) == 0xe)
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mem_mapping_disable(&tandy->ram_mapping);
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else
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mem_mapping_set_addr(&tandy->ram_mapping, ((val >> 1) & 7) * 128 * 1024, 0x20000);
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tandysl_recalcaddress(tandy);
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break;
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}
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}
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static uint8_t tandysl_in(uint16_t addr, void *p)
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{
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tandysl_t *tandy = (tandysl_t *)p;
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switch (addr)
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{
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case 0x3d4:
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return tandy->crtcreg;
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case 0x3d5:
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return tandy->crtc[tandy->crtcreg];
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case 0x3da:
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return tandy->stat;
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}
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return 0xFF;
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}
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static void tandysl_recalcaddress(tandysl_t *tandy)
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{
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tandy->b8000_limit = 0x8000;
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if (tandy->array[5] & 1)
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{
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tandy->vram = &ram[((tandy->memctrl & 0x04) << 14) + tandy->base];
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tandy->b8000 = &ram[((tandy->memctrl & 0x20) << 11) + tandy->base];
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}
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else if ((tandy->memctrl & 0xc0) == 0xc0)
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{
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tandy->vram = &ram[((tandy->memctrl & 0x06) << 14) + tandy->base];
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tandy->b8000 = &ram[((tandy->memctrl & 0x30) << 11) + tandy->base];
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}
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else
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{
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tandy->vram = &ram[((tandy->memctrl & 0x07) << 14) + tandy->base];
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tandy->b8000 = &ram[((tandy->memctrl & 0x38) << 11) + tandy->base];
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if ((tandy->memctrl & 0x38) == 0x38)
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tandy->b8000_limit = 0x4000;
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}
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}
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static void tandysl_recalcmapping(tandysl_t *tandy)
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{
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mem_mapping_disable(&tandy->mapping);
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io_removehandler(0x03d0, 0x0010, tandysl_in, NULL, NULL, tandysl_out, NULL, NULL, tandy);
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if (tandy->planar_ctrl & 4)
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{
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mem_mapping_enable(&tandy->mapping);
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if (tandy->array[5] & 1)
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{
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mem_mapping_set_addr(&tandy->mapping, 0xa0000, 0x10000);
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}
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else
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{
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mem_mapping_set_addr(&tandy->mapping, 0xb8000, 0x8000);
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}
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io_sethandler(0x03d0, 0x0010, tandysl_in, NULL, NULL, tandysl_out, NULL, NULL, tandy);
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}
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else
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{
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mem_mapping_disable(&tandy->mapping);
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io_removehandler(0x03d0, 0x0010, tandysl_in, NULL, NULL, tandysl_out, NULL, NULL, tandy);
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}
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}
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static void tandysl_ram_write(uint32_t addr, uint8_t val, void *p)
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{
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tandysl_t *tandy = (tandysl_t *)p;
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ram[tandy->base + (addr & 0x1ffff)] = val;
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}
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static uint8_t tandysl_ram_read(uint32_t addr, void *p)
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{
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tandysl_t *tandy = (tandysl_t *)p;
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return ram[tandy->base + (addr & 0x1ffff)];
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}
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static void tandysl_write(uint32_t addr, uint8_t val, void *p)
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{
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tandysl_t *tandy = (tandysl_t *)p;
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if (tandy->memctrl == -1)
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return;
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egawrites++;
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if (tandy->array[5] & 1)
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tandy->b8000[addr & 0xffff] = val;
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else
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{
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if ((addr & 0x7fff) >= tandy->b8000_limit)
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return;
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tandy->b8000[addr & 0x7fff] = val;
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}
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}
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static uint8_t tandysl_read(uint32_t addr, void *p)
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{
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tandysl_t *tandy = (tandysl_t *)p;
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if (tandy->memctrl == -1)
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return 0xff;
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egareads++;
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if (tandy->array[5] & 1)
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return tandy->b8000[addr & 0xffff];
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if ((addr & 0x7fff) >= tandy->b8000_limit)
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return 0xff;
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return tandy->b8000[addr & 0x7fff];
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}
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static void tandysl_recalctimings(tandysl_t *tandy)
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{
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double _dispontime, _dispofftime, disptime;
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if (tandy->mode & 1)
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{
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disptime = tandy->crtc[0] + 1;
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_dispontime = tandy->crtc[1];
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}
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else
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{
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disptime = (tandy->crtc[0] + 1) << 1;
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_dispontime = tandy->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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tandy->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT));
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tandy->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT));
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}
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static void tandysl_poll(void *p)
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{
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tandysl_t *tandy = (tandysl_t *)p;
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uint16_t ca = (tandy->crtc[15] | (tandy->crtc[14] << 8)) & 0x3fff;
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int drawcursor;
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int x, c;
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int oldvc;
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uint8_t chr, attr;
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uint16_t dat;
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int cols[4];
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int col;
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int oldsc;
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if (!tandy->linepos)
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{
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tandy->vidtime += tandy->dispofftime;
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tandy->stat |= 1;
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tandy->linepos = 1;
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oldsc = tandy->sc;
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if ((tandy->crtc[8] & 3) == 3)
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tandy->sc = (tandy->sc << 1) & 7;
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if (tandy->dispon)
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{
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if (tandy->displine < tandy->firstline)
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{
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tandy->firstline = tandy->displine;
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video_wait_for_buffer();
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}
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tandy->lastline = tandy->displine;
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cols[0] = (tandy->array[2] & 0xf) + 16;
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for (c = 0; c < 8; c++)
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{
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if (tandy->array[3] & 4)
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{
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buffer->line[tandy->displine][c] = cols[0];
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if (tandy->mode & 1) buffer->line[tandy->displine][c + (tandy->crtc[1] << 3) + 8] = cols[0];
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else buffer->line[tandy->displine][c + (tandy->crtc[1] << 4) + 8] = cols[0];
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}
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else if ((tandy->mode & 0x12) == 0x12)
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{
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buffer->line[tandy->displine][c] = 0;
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if (tandy->mode & 1) buffer->line[tandy->displine][c + (tandy->crtc[1] << 3) + 8] = 0;
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else buffer->line[tandy->displine][c + (tandy->crtc[1] << 4) + 8] = 0;
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}
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else
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{
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buffer->line[tandy->displine][c] = (tandy->col & 15) + 16;
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if (tandy->mode & 1) buffer->line[tandy->displine][c + (tandy->crtc[1] << 3) + 8] = (tandy->col & 15) + 16;
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else buffer->line[tandy->displine][c + (tandy->crtc[1] << 4) + 8] = (tandy->col & 15) + 16;
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}
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}
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if (tandy->array[5] & 1) /*640x200x16*/
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{
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for (x = 0; x < tandy->crtc[1]*2; x++)
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{
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dat = (tandy->vram[(tandy->ma << 1) & 0xffff] << 8) |
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tandy->vram[((tandy->ma << 1) + 1) & 0xffff];
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tandy->ma++;
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buffer->line[tandy->displine][(x << 2) + 8] = tandy->array[((dat >> 12) & 0xf)/*tandy->array[1])*/ + 16] + 16;
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buffer->line[tandy->displine][(x << 2) + 9] = tandy->array[((dat >> 8) & 0xf)/*tandy->array[1])*/ + 16] + 16;
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buffer->line[tandy->displine][(x << 2) + 10] = tandy->array[((dat >> 4) & 0xf)/*tandy->array[1])*/ + 16] + 16;
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buffer->line[tandy->displine][(x << 2) + 11] = tandy->array[(dat & 0xf)/*tandy->array[1])*/ + 16] + 16;
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}
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}
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else if ((tandy->array[3] & 0x10) && (tandy->mode & 1)) /*320x200x16*/
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{
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for (x = 0; x < tandy->crtc[1]; x++)
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{
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dat = (tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 3) * 0x2000)] << 8) |
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tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 3) * 0x2000) + 1];
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tandy->ma++;
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buffer->line[tandy->displine][(x << 3) + 8] =
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buffer->line[tandy->displine][(x << 3) + 9] = tandy->array[((dat >> 12) & tandy->array[1]) + 16] + 16;
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buffer->line[tandy->displine][(x << 3) + 10] =
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buffer->line[tandy->displine][(x << 3) + 11] = tandy->array[((dat >> 8) & tandy->array[1]) + 16] + 16;
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buffer->line[tandy->displine][(x << 3) + 12] =
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buffer->line[tandy->displine][(x << 3) + 13] = tandy->array[((dat >> 4) & tandy->array[1]) + 16] + 16;
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buffer->line[tandy->displine][(x << 3) + 14] =
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buffer->line[tandy->displine][(x << 3) + 15] = tandy->array[(dat & tandy->array[1]) + 16] + 16;
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}
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}
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else if (tandy->array[3] & 0x10) /*160x200x16*/
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{
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for (x = 0; x < tandy->crtc[1]; x++)
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{
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dat = (tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 1) * 0x2000)] << 8) |
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tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 1) * 0x2000) + 1];
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tandy->ma++;
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buffer->line[tandy->displine][(x << 4) + 8] =
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buffer->line[tandy->displine][(x << 4) + 9] =
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buffer->line[tandy->displine][(x << 4) + 10] =
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buffer->line[tandy->displine][(x << 4) + 11] = tandy->array[((dat >> 12) & tandy->array[1]) + 16] + 16;
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buffer->line[tandy->displine][(x << 4) + 12] =
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buffer->line[tandy->displine][(x << 4) + 13] =
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buffer->line[tandy->displine][(x << 4) + 14] =
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buffer->line[tandy->displine][(x << 4) + 15] = tandy->array[((dat >> 8) & tandy->array[1]) + 16] + 16;
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buffer->line[tandy->displine][(x << 4) + 16] =
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buffer->line[tandy->displine][(x << 4) + 17] =
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buffer->line[tandy->displine][(x << 4) + 18] =
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buffer->line[tandy->displine][(x << 4) + 19] = tandy->array[((dat >> 4) & tandy->array[1]) + 16] + 16;
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buffer->line[tandy->displine][(x << 4) + 20] =
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buffer->line[tandy->displine][(x << 4) + 21] =
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buffer->line[tandy->displine][(x << 4) + 22] =
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buffer->line[tandy->displine][(x << 4) + 23] = tandy->array[(dat & tandy->array[1]) + 16] + 16;
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}
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}
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else if (tandy->array[3] & 0x08) /*640x200x4 - this implementation is a complete guess!*/
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{
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for (x = 0; x < tandy->crtc[1]; x++)
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{
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dat = (tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 3) * 0x2000)] << 8) |
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tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 3) * 0x2000) + 1];
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tandy->ma++;
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for (c = 0; c < 8; c++)
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{
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chr = (dat >> 7) & 1;
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chr |= ((dat >> 14) & 2);
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buffer->line[tandy->displine][(x << 3) + 8 + c] = tandy->array[(chr & tandy->array[1]) + 16] + 16;
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dat <<= 1;
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}
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}
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}
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else if (tandy->mode & 1)
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{
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for (x = 0; x < tandy->crtc[1]; x++)
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{
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chr = tandy->vram[ (tandy->ma << 1) & 0x3fff];
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attr = tandy->vram[((tandy->ma << 1) + 1) & 0x3fff];
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drawcursor = ((tandy->ma == ca) && tandy->con && tandy->cursoron);
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if (tandy->mode & 0x20)
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{
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cols[1] = tandy->array[ ((attr & 15) & tandy->array[1]) + 16] + 16;
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cols[0] = tandy->array[(((attr >> 4) & 7) & tandy->array[1]) + 16] + 16;
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if ((tandy->blink & 16) && (attr & 0x80) && !drawcursor)
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cols[1] = cols[0];
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}
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else
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{
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cols[1] = tandy->array[((attr & 15) & tandy->array[1]) + 16] + 16;
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cols[0] = tandy->array[((attr >> 4) & tandy->array[1]) + 16] + 16;
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}
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if (tandy->sc & 8)
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{
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for (c = 0; c < 8; c++)
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buffer->line[tandy->displine][(x << 3) + c + 8] = cols[0];
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}
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else
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{
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for (c = 0; c < 8; c++)
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buffer->line[tandy->displine][(x << 3) + c + 8] = cols[(fontdat[chr][tandy->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
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}
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if (drawcursor)
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{
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for (c = 0; c < 8; c++)
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buffer->line[tandy->displine][(x << 3) + c + 8] ^= 15;
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}
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tandy->ma++;
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}
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}
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else if (!(tandy->mode & 2))
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{
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for (x = 0; x < tandy->crtc[1]; x++)
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{
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chr = tandy->vram[ (tandy->ma << 1) & 0x3fff];
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attr = tandy->vram[((tandy->ma << 1) + 1) & 0x3fff];
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drawcursor = ((tandy->ma == ca) && tandy->con && tandy->cursoron);
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if (tandy->mode & 0x20)
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{
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cols[1] = tandy->array[ ((attr & 15) & tandy->array[1]) + 16] + 16;
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cols[0] = tandy->array[(((attr >> 4) & 7) & tandy->array[1]) + 16] + 16;
|
|
if ((tandy->blink & 16) && (attr & 0x80) && !drawcursor)
|
|
cols[1] = cols[0];
|
|
}
|
|
else
|
|
{
|
|
cols[1] = tandy->array[((attr & 15) & tandy->array[1]) + 16] + 16;
|
|
cols[0] = tandy->array[((attr >> 4) & tandy->array[1]) + 16] + 16;
|
|
}
|
|
tandy->ma++;
|
|
if (tandy->sc & 8)
|
|
{
|
|
for (c = 0; c < 8; c++)
|
|
buffer->line[tandy->displine][(x << 4) + (c << 1) + 8] =
|
|
buffer->line[tandy->displine][(x << 4) + (c << 1) + 1 + 8] = cols[0];
|
|
}
|
|
else
|
|
{
|
|
for (c = 0; c < 8; c++)
|
|
buffer->line[tandy->displine][(x << 4) + (c << 1) + 8] =
|
|
buffer->line[tandy->displine][(x << 4) + (c << 1) + 1 + 8] = cols[(fontdat[chr][tandy->sc & 7] & (1 << (c ^ 7))) ? 1 : 0];
|
|
}
|
|
if (drawcursor)
|
|
{
|
|
for (c = 0; c < 16; c++)
|
|
buffer->line[tandy->displine][(x << 4) + c + 8] ^= 15;
|
|
}
|
|
}
|
|
}
|
|
else if (!(tandy->mode& 16))
|
|
{
|
|
cols[0] = (tandy->col & 15) | 16;
|
|
col = (tandy->col & 16) ? 24 : 16;
|
|
if (tandy->mode & 4)
|
|
{
|
|
cols[1] = col | 3;
|
|
cols[2] = col | 4;
|
|
cols[3] = col | 7;
|
|
}
|
|
else if (tandy->col & 32)
|
|
{
|
|
cols[1] = col | 3;
|
|
cols[2] = col | 5;
|
|
cols[3] = col | 7;
|
|
}
|
|
else
|
|
{
|
|
cols[1] = col | 2;
|
|
cols[2] = col | 4;
|
|
cols[3] = col | 6;
|
|
}
|
|
for (x = 0; x < tandy->crtc[1]; x++)
|
|
{
|
|
dat = (tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 1) * 0x2000)] << 8) |
|
|
tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 1) * 0x2000) + 1];
|
|
tandy->ma++;
|
|
for (c = 0; c < 8; c++)
|
|
{
|
|
buffer->line[tandy->displine][(x << 4) + (c << 1) + 8] =
|
|
buffer->line[tandy->displine][(x << 4) + (c << 1) + 1 + 8] = cols[dat >> 14];
|
|
dat <<= 2;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
cols[0] = 0;
|
|
cols[1] = tandy->array[(tandy->col & tandy->array[1]) + 16] + 16;
|
|
for (x = 0; x < tandy->crtc[1]; x++)
|
|
{
|
|
dat = (tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 1) * 0x2000)] << 8) |
|
|
tandy->vram[((tandy->ma << 1) & 0x1fff) + ((tandy->sc & 1) * 0x2000) + 1];
|
|
tandy->ma++;
|
|
for (c = 0; c < 16; c++)
|
|
{
|
|
buffer->line[tandy->displine][(x << 4) + c + 8] = cols[dat >> 15];
|
|
dat <<= 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (tandy->array[3] & 4)
|
|
{
|
|
if (tandy->mode & 1) hline(buffer, 0, tandy->displine, (tandy->crtc[1] << 3) + 16, (tandy->array[2] & 0xf) + 16);
|
|
else hline(buffer, 0, tandy->displine, (tandy->crtc[1] << 4) + 16, (tandy->array[2] & 0xf) + 16);
|
|
}
|
|
else
|
|
{
|
|
cols[0] = ((tandy->mode & 0x12) == 0x12) ? 0 : (tandy->col & 0xf) + 16;
|
|
if (tandy->mode & 1) hline(buffer, 0, tandy->displine, (tandy->crtc[1] << 3) + 16, cols[0]);
|
|
else hline(buffer, 0, tandy->displine, (tandy->crtc[1] << 4) + 16, cols[0]);
|
|
}
|
|
}
|
|
if (tandy->mode & 1) x = (tandy->crtc[1] << 3) + 16;
|
|
else x = (tandy->crtc[1] << 4) + 16;
|
|
tandy->sc = oldsc;
|
|
if (tandy->vc == tandy->crtc[7] && !tandy->sc)
|
|
{
|
|
tandy->stat |= 8;
|
|
}
|
|
tandy->displine++;
|
|
if (tandy->displine >= 360)
|
|
tandy->displine = 0;
|
|
}
|
|
else
|
|
{
|
|
tandy->vidtime += tandy->dispontime;
|
|
if (tandy->dispon)
|
|
tandy->stat &= ~1;
|
|
tandy->linepos = 0;
|
|
if (tandy->vsynctime)
|
|
{
|
|
tandy->vsynctime--;
|
|
if (!tandy->vsynctime)
|
|
{
|
|
tandy->stat &= ~8;
|
|
}
|
|
}
|
|
if (tandy->sc == (tandy->crtc[11] & 31) || ((tandy->crtc[8] & 3) == 3 && tandy->sc == ((tandy->crtc[11] & 31) >> 1)))
|
|
{
|
|
tandy->con = 0;
|
|
tandy->coff = 1;
|
|
}
|
|
if (tandy->vadj)
|
|
{
|
|
tandy->sc++;
|
|
tandy->sc &= 31;
|
|
tandy->ma = tandy->maback;
|
|
tandy->vadj--;
|
|
if (!tandy->vadj)
|
|
{
|
|
tandy->dispon = 1;
|
|
if (tandy->array[5] & 1)
|
|
tandy->ma = tandy->maback = tandy->crtc[13] | (tandy->crtc[12] << 8);
|
|
else
|
|
tandy->ma = tandy->maback = (tandy->crtc[13] | (tandy->crtc[12] << 8)) & 0x3fff;
|
|
tandy->sc = 0;
|
|
}
|
|
}
|
|
else if (tandy->sc == tandy->crtc[9] || ((tandy->crtc[8] & 3) == 3 && tandy->sc == (tandy->crtc[9] >> 1)))
|
|
{
|
|
tandy->maback = tandy->ma;
|
|
tandy->sc = 0;
|
|
oldvc = tandy->vc;
|
|
tandy->vc++;
|
|
tandy->vc &= 255;
|
|
if (tandy->vc == tandy->crtc[6])
|
|
{
|
|
tandy->dispon = 0;
|
|
}
|
|
if (oldvc == tandy->crtc[4])
|
|
{
|
|
tandy->vc = 0;
|
|
tandy->vadj = tandy->crtc[5];
|
|
if (!tandy->vadj)
|
|
tandy->dispon = 1;
|
|
if (!tandy->vadj)
|
|
{
|
|
if (tandy->array[5] & 1)
|
|
tandy->ma = tandy->maback = tandy->crtc[13] | (tandy->crtc[12] << 8);
|
|
else
|
|
tandy->ma = tandy->maback = (tandy->crtc[13] | (tandy->crtc[12] << 8)) & 0x3fff;
|
|
}
|
|
if ((tandy->crtc[10] & 0x60) == 0x20) tandy->cursoron = 0;
|
|
else tandy->cursoron = tandy->blink & 16;
|
|
}
|
|
if (tandy->vc == tandy->crtc[7])
|
|
{
|
|
tandy->dispon = 0;
|
|
tandy->displine = 0;
|
|
tandy->vsynctime = 16;
|
|
if (tandy->crtc[7])
|
|
{
|
|
if (tandy->mode & 1) x = (tandy->crtc[1] << 3) + 16;
|
|
else x = (tandy->crtc[1] << 4) + 16;
|
|
tandy->lastline++;
|
|
if (x != xsize || (tandy->lastline - tandy->firstline) != ysize)
|
|
{
|
|
xsize = x;
|
|
ysize = tandy->lastline - tandy->firstline;
|
|
if (xsize < 64) xsize = 656;
|
|
if (ysize < 32) ysize = 200;
|
|
updatewindowsize(xsize, (ysize << 1) + 16);
|
|
}
|
|
|
|
video_blit_memtoscreen_8(0, tandy->firstline-4, xsize, (tandy->lastline - tandy->firstline) + 8);
|
|
|
|
frames++;
|
|
video_res_x = xsize - 16;
|
|
video_res_y = ysize;
|
|
if ((tandy->array[3] & 0x10) && (tandy->mode & 1)) /*320x200x16*/
|
|
{
|
|
video_res_x /= 2;
|
|
video_bpp = 4;
|
|
}
|
|
else if (tandy->array[3] & 0x10) /*160x200x16*/
|
|
{
|
|
video_res_x /= 4;
|
|
video_bpp = 4;
|
|
}
|
|
else if (tandy->array[3] & 0x08) /*640x200x4 - this implementation is a complete guess!*/
|
|
video_bpp = 2;
|
|
else if (tandy->mode & 1)
|
|
{
|
|
video_res_x /= 8;
|
|
video_res_y /= tandy->crtc[9] + 1;
|
|
video_bpp = 0;
|
|
}
|
|
else if (!(tandy->mode & 2))
|
|
{
|
|
video_res_x /= 16;
|
|
video_res_y /= tandy->crtc[9] + 1;
|
|
video_bpp = 0;
|
|
}
|
|
else if (!(tandy->mode & 16))
|
|
{
|
|
video_res_x /= 2;
|
|
video_bpp = 2;
|
|
}
|
|
else
|
|
video_bpp = 1;
|
|
}
|
|
tandy->firstline = 1000;
|
|
tandy->lastline = 0;
|
|
tandy->blink++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tandy->sc++;
|
|
tandy->sc &= 31;
|
|
tandy->ma = tandy->maback;
|
|
}
|
|
if ((tandy->sc == (tandy->crtc[10] & 31) || ((tandy->crtc[8] & 3) == 3 && tandy->sc == ((tandy->crtc[10] & 31) >> 1))))
|
|
tandy->con = 1;
|
|
}
|
|
}
|
|
|
|
static void *tandysl_init()
|
|
{
|
|
tandysl_t *tandy = malloc(sizeof(tandysl_t));
|
|
memset(tandy, 0, sizeof(tandysl_t));
|
|
|
|
tandy->memctrl = -1;
|
|
tandy->base = (mem_size - 128) * 1024;
|
|
tandy->b8000_limit = 0x8000;
|
|
tandy->planar_ctrl = 4;
|
|
|
|
timer_add(tandysl_poll, &tandy->vidtime, TIMER_ALWAYS_ENABLED, tandy);
|
|
mem_mapping_add(&tandy->mapping, 0xb8000, 0x08000, tandysl_read, NULL, NULL, tandysl_write, NULL, NULL, NULL, 0, tandy);
|
|
mem_mapping_add(&tandy->ram_mapping, 0x80000, 0x20000, tandysl_ram_read, NULL, NULL, tandysl_ram_write, NULL, NULL, NULL, 0, tandy);
|
|
/*Base 128k mapping is controlled via port 0xffe8, so we remove it from the main mapping*/
|
|
mem_mapping_set_addr(&ram_low_mapping, 0, (mem_size - 128) * 1024);
|
|
io_sethandler(0x03d0, 0x0010, tandysl_in, NULL, NULL, tandysl_out, NULL, NULL, tandy);
|
|
io_sethandler(0xffe8, 0x0001, tandysl_in, NULL, NULL, tandysl_out, NULL, NULL, tandy);
|
|
io_sethandler(0x0065, 0x0001, tandysl_in, NULL, NULL, tandysl_out, NULL, NULL, tandy);
|
|
overscan_x = overscan_y = 16;
|
|
return tandy;
|
|
}
|
|
|
|
static void tandysl_close(void *p)
|
|
{
|
|
tandysl_t *tandy = (tandysl_t *)p;
|
|
|
|
free(tandy);
|
|
}
|
|
|
|
static void tandysl_speed_changed(void *p)
|
|
{
|
|
tandysl_t *tandy = (tandysl_t *)p;
|
|
|
|
tandysl_recalctimings(tandy);
|
|
}
|
|
|
|
device_t tandysl_device =
|
|
{
|
|
"Tandy 1000SL (video)",
|
|
0,
|
|
tandysl_init,
|
|
tandysl_close,
|
|
NULL,
|
|
tandysl_speed_changed,
|
|
NULL,
|
|
NULL
|
|
};
|