699 lines
20 KiB
C
699 lines
20 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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* Oak OTI037C/67/077 emulation.
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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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*
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* Copyright 2008-2018 Sarah Walker.
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* Copyright 2016-2018 Miran Grca.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include <86box/86box.h>
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#include <86box/io.h>
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#include <86box/timer.h>
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#include <86box/mem.h>
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#include <86box/rom.h>
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#include <86box/device.h>
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#include <86box/video.h>
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#include <86box/vid_svga.h>
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#include <86box/vid_svga_render.h>
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#include <86box/plat_unused.h>
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#define BIOS_037C_PATH "roms/video/oti/bios.bin"
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#define BIOS_067_AMA932J_PATH "roms/machines/ama932j/OTI067.BIN"
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#define BIOS_067_M300_08_PATH "roms/machines/m30008/EVC_BIOS.ROM"
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#define BIOS_067_M300_15_PATH "roms/machines/m30015/EVC_BIOS.ROM"
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#define BIOS_077_PATH "roms/video/oti/oti077.vbi"
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enum {
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OTI_037C = 0,
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OTI_067 = 2,
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OTI_067_AMA932J = 3,
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OTI_067_M300 = 4,
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OTI_077 = 5
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};
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typedef struct {
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svga_t svga;
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rom_t bios_rom;
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int index;
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uint8_t regs[32];
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uint8_t chip_id;
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uint8_t pos;
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uint8_t enable_register;
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uint8_t dipswitch_val;
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uint32_t vram_size;
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uint32_t vram_mask;
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} oti_t;
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static video_timings_t timing_oti = { .type = VIDEO_ISA, .write_b = 6, .write_w = 8, .write_l = 16, .read_b = 6, .read_w = 8, .read_l = 16 };
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static void
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oti_out(uint16_t addr, uint8_t val, void *priv)
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{
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oti_t *oti = (oti_t *) priv;
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svga_t *svga = &oti->svga;
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uint8_t old;
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uint8_t idx;
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uint8_t enable;
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if (!oti->chip_id && !(oti->enable_register & 1) && (addr != 0x3C3))
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return;
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if ((((addr & 0xFFF0) == 0x3D0 || (addr & 0xFFF0) == 0x3B0) && addr < 0x3de) && !(svga->miscout & 1))
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addr ^= 0x60;
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switch (addr) {
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case 0x3C3:
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if (!oti->chip_id) {
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oti->enable_register = val & 1;
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return;
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}
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svga_out(addr, val, svga);
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return;
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case 0x3c6:
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case 0x3c7:
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case 0x3c8:
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case 0x3c9:
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if (oti->chip_id == OTI_077)
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sc1148x_ramdac_out(addr, 0, val, svga->ramdac, svga);
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else
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svga_out(addr, val, svga);
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return;
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case 0x3D4:
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if (oti->chip_id)
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svga->crtcreg = val & 0x3f;
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else
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svga->crtcreg = val; /* FIXME: The BIOS wants to set the test bit? */
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return;
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case 0x3D5:
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if (oti->chip_id && (svga->crtcreg & 0x20))
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return;
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idx = svga->crtcreg;
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if (!oti->chip_id)
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idx &= 0x1f;
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if ((idx < 7) && (svga->crtc[0x11] & 0x80))
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return;
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if ((idx == 7) && (svga->crtc[0x11] & 0x80))
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val = (svga->crtc[7] & ~0x10) | (val & 0x10);
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old = svga->crtc[idx];
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svga->crtc[idx] = val;
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if (old != val) {
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if ((idx < 0x0e) || (idx > 0x10)) {
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if (idx == 0x0c || idx == 0x0d) {
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svga->fullchange = 3;
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svga->ma_latch = ((svga->crtc[0xc] << 8) | svga->crtc[0xd]) + ((svga->crtc[8] & 0x60) >> 5);
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} else {
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svga->fullchange = changeframecount;
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svga_recalctimings(svga);
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}
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}
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}
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break;
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case 0x3DE:
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if (oti->chip_id)
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oti->index = val & 0x1f;
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else
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oti->index = val;
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return;
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case 0x3DF:
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idx = oti->index;
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if (!oti->chip_id)
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idx &= 0x1f;
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oti->regs[idx] = val;
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switch (idx) {
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case 0xD:
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if (oti->chip_id == OTI_067) {
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svga->vram_display_mask = (val & 0x0c) ? oti->vram_mask : 0x3ffff;
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if (!(val & 0x80))
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svga->vram_display_mask = 0x3ffff;
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if ((val & 0x80) && oti->vram_size == 256)
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mem_mapping_disable(&svga->mapping);
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else
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mem_mapping_enable(&svga->mapping);
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} else if (oti->chip_id == OTI_077) {
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svga->vram_display_mask = (val & 0x0c) ? oti->vram_mask : 0x3ffff;
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switch ((val & 0xc0) >> 6) {
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default:
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case 0x00: /* 256 kB of memory */
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enable = (oti->vram_size >= 256);
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if (val & 0x0c)
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svga->vram_display_mask = MIN(oti->vram_mask, 0x3ffff);
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break;
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case 0x01: /* 1 MB of memory */
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case 0x03:
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enable = (oti->vram_size >= 1024);
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if (val & 0x0c)
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svga->vram_display_mask = MIN(oti->vram_mask, 0xfffff);
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break;
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case 0x02: /* 512 kB of memory */
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enable = (oti->vram_size >= 512);
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if (val & 0x0c)
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svga->vram_display_mask = MIN(oti->vram_mask, 0x7ffff);
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break;
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}
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if (enable)
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mem_mapping_enable(&svga->mapping);
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else
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mem_mapping_disable(&svga->mapping);
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} else {
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if (val & 0x80)
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mem_mapping_disable(&svga->mapping);
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else
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mem_mapping_enable(&svga->mapping);
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}
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break;
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case 0x11:
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svga->read_bank = (val & 0xf) * 65536;
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svga->write_bank = (val >> 4) * 65536;
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break;
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default:
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break;
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}
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return;
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default:
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break;
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}
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svga_out(addr, val, svga);
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}
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static uint8_t
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oti_in(uint16_t addr, void *priv)
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{
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oti_t *oti = (oti_t *) priv;
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svga_t *svga = &oti->svga;
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uint8_t idx;
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uint8_t temp;
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if (!oti->chip_id && !(oti->enable_register & 1) && (addr != 0x3C3))
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return 0xff;
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if ((((addr & 0xFFF0) == 0x3D0 || (addr & 0xFFF0) == 0x3B0) && addr < 0x3de) && !(svga->miscout & 1))
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addr ^= 0x60;
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switch (addr) {
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case 0x3C2:
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if ((svga->vgapal[0].r + svga->vgapal[0].g + svga->vgapal[0].b) >= 0x50)
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temp = 0;
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else
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temp = 0x10;
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break;
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case 0x3C3:
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if (oti->chip_id)
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temp = svga_in(addr, svga);
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else
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temp = oti->enable_register;
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break;
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case 0x3c6:
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case 0x3c7:
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case 0x3c8:
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case 0x3c9:
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if (oti->chip_id == OTI_077)
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return sc1148x_ramdac_in(addr, 0, svga->ramdac, svga);
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return svga_in(addr, svga);
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case 0x3CF:
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return svga->gdcreg[svga->gdcaddr & 0xf];
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case 0x3D4:
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temp = svga->crtcreg;
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break;
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case 0x3D5:
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if (oti->chip_id) {
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if (svga->crtcreg & 0x20)
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temp = 0xff;
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else
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temp = svga->crtc[svga->crtcreg];
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} else
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temp = svga->crtc[svga->crtcreg & 0x1f];
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break;
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case 0x3DA:
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if (oti->chip_id) {
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temp = svga_in(addr, svga);
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break;
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}
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svga->attrff = 0;
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/*The OTI-037C BIOS waits for bits 0 and 3 in 0x3da to go low, then reads 0x3da again
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and expects the diagnostic bits to equal the current border colour. As I understand
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it, the 0x3da active enable status does not include the border time, so this may be
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an area where OTI-037C is not entirely VGA compatible.*/
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svga->cgastat &= ~0x30;
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/* copy color diagnostic info from the overscan color register */
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switch (svga->attrregs[0x12] & 0x30) {
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case 0x00: /* P0 and P2 */
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if (svga->attrregs[0x11] & 0x01)
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svga->cgastat |= 0x10;
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if (svga->attrregs[0x11] & 0x04)
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svga->cgastat |= 0x20;
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break;
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case 0x10: /* P4 and P5 */
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if (svga->attrregs[0x11] & 0x10)
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svga->cgastat |= 0x10;
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if (svga->attrregs[0x11] & 0x20)
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svga->cgastat |= 0x20;
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break;
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case 0x20: /* P1 and P3 */
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if (svga->attrregs[0x11] & 0x02)
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svga->cgastat |= 0x10;
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if (svga->attrregs[0x11] & 0x08)
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svga->cgastat |= 0x20;
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break;
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case 0x30: /* P6 and P7 */
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if (svga->attrregs[0x11] & 0x40)
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svga->cgastat |= 0x10;
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if (svga->attrregs[0x11] & 0x80)
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svga->cgastat |= 0x20;
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break;
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default:
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break;
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}
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temp = svga->cgastat;
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break;
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case 0x3DE:
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temp = oti->index;
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if (oti->chip_id)
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temp |= (oti->chip_id << 5);
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break;
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case 0x3DF:
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idx = oti->index;
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if (!oti->chip_id)
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idx &= 0x1f;
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if (idx == 0x10)
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temp = oti->dipswitch_val;
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else
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temp = oti->regs[idx];
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break;
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default:
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temp = svga_in(addr, svga);
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break;
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}
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return temp;
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}
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static void
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oti_pos_out(UNUSED(uint16_t addr), uint8_t val, void *priv)
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{
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oti_t *oti = (oti_t *) priv;
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if ((val ^ oti->pos) & 8) {
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if (val & 8)
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io_sethandler(0x03c0, 32, oti_in, NULL, NULL,
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oti_out, NULL, NULL, oti);
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else
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io_removehandler(0x03c0, 32, oti_in, NULL, NULL,
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oti_out, NULL, NULL, oti);
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}
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oti->pos = val;
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}
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static uint8_t
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oti_pos_in(UNUSED(uint16_t addr), void *priv)
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{
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const oti_t *oti = (oti_t *) priv;
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return (oti->pos);
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}
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static float
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oti_getclock(int clock)
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{
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float ret = 0.0;
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switch (clock) {
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default:
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case 0:
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ret = 25175000.0;
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break;
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case 1:
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ret = 28322000.0;
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break;
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case 4:
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ret = 14318000.0;
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break;
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case 5:
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ret = 16257000.0;
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break;
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case 7:
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ret = 35500000.0;
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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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oti_recalctimings(svga_t *svga)
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{
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const oti_t *oti = (oti_t *) svga->priv;
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int clk_sel = ((svga->miscout >> 2) & 3) | ((oti->regs[0x0d] & 0x20) >> 3);
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svga->clock = (cpuclock * (double) (1ULL << 32)) / oti_getclock(clk_sel);
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if (oti->chip_id > 0) {
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if (oti->regs[0x14] & 0x08)
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svga->ma_latch |= 0x10000;
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if (oti->regs[0x16] & 0x08)
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svga->ma_latch |= 0x20000;
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if (oti->regs[0x14] & 0x01)
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svga->vtotal += 0x400;
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if (oti->regs[0x14] & 0x02)
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svga->dispend += 0x400;
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if (oti->regs[0x14] & 0x04)
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svga->vsyncstart += 0x400;
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svga->interlace = oti->regs[0x14] & 0x80;
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}
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if ((oti->regs[0x0d] & 0x0c) && !(oti->regs[0x0d] & 0x10))
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svga->rowoffset <<= 1;
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if (svga->bpp == 16) {
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svga->render = svga_render_16bpp_highres;
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svga->hdisp >>= 1;
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} else if (svga->bpp == 15) {
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svga->render = svga_render_15bpp_highres;
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svga->hdisp >>= 1;
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}
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}
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static void *
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oti_init(const device_t *info)
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{
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oti_t *oti = malloc(sizeof(oti_t));
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const char *romfn = NULL;
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memset(oti, 0x00, sizeof(oti_t));
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oti->chip_id = info->local;
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oti->dipswitch_val = 0x18;
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switch (oti->chip_id) {
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case OTI_037C:
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romfn = BIOS_037C_PATH;
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oti->vram_size = 256;
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oti->regs[0] = 0x08; /* FIXME: The BIOS wants to read this at index 0? This index is undocumented. */
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#if 0
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io_sethandler(0x03c0, 32,
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oti_in, NULL, NULL, oti_out, NULL, NULL, oti);
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#endif
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break;
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case OTI_067_AMA932J:
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romfn = BIOS_067_AMA932J_PATH;
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oti->chip_id = 2;
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oti->vram_size = device_get_config_int("memory");
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oti->dipswitch_val |= 0x20;
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oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
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io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
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break;
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case OTI_067_M300:
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if (rom_present(BIOS_067_M300_15_PATH))
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romfn = BIOS_067_M300_15_PATH;
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else
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romfn = BIOS_067_M300_08_PATH;
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oti->vram_size = device_get_config_int("memory");
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oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
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io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
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break;
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case OTI_067:
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case OTI_077:
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romfn = BIOS_077_PATH;
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oti->vram_size = device_get_config_int("memory");
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oti->pos = 0x08; /* Tell the BIOS the I/O ports are already enabled to avoid a double I/O handler mess. */
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io_sethandler(0x46e8, 1, oti_pos_in, NULL, NULL, oti_pos_out, NULL, NULL, oti);
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break;
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default:
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break;
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}
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if (romfn != NULL) {
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rom_init(&oti->bios_rom, romfn,
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0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
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}
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oti->vram_mask = (oti->vram_size << 10) - 1;
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video_inform(VIDEO_FLAG_TYPE_SPECIAL, &timing_oti);
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svga_init(info, &oti->svga, oti, oti->vram_size << 10,
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oti_recalctimings, oti_in, oti_out, NULL, NULL);
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if (oti->chip_id == OTI_077)
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oti->svga.ramdac = device_add(&sc11487_ramdac_device); /*Actually a 82c487, probably a clone.*/
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io_sethandler(0x03c0, 32,
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oti_in, NULL, NULL, oti_out, NULL, NULL, oti);
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oti->svga.miscout = 1;
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oti->svga.packed_chain4 = 1;
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return oti;
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}
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static void
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oti_close(void *priv)
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{
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oti_t *oti = (oti_t *) priv;
|
|
|
|
svga_close(&oti->svga);
|
|
|
|
free(oti);
|
|
}
|
|
|
|
static void
|
|
oti_speed_changed(void *priv)
|
|
{
|
|
oti_t *oti = (oti_t *) priv;
|
|
|
|
svga_recalctimings(&oti->svga);
|
|
}
|
|
|
|
static void
|
|
oti_force_redraw(void *priv)
|
|
{
|
|
oti_t *oti = (oti_t *) priv;
|
|
|
|
oti->svga.fullchange = changeframecount;
|
|
}
|
|
|
|
static int
|
|
oti037c_available(void)
|
|
{
|
|
return (rom_present(BIOS_037C_PATH));
|
|
}
|
|
|
|
static int
|
|
oti067_ama932j_available(void)
|
|
{
|
|
return (rom_present(BIOS_067_AMA932J_PATH));
|
|
}
|
|
|
|
static int
|
|
oti067_077_available(void)
|
|
{
|
|
return (rom_present(BIOS_077_PATH));
|
|
}
|
|
|
|
static int
|
|
oti067_m300_available(void)
|
|
{
|
|
if (rom_present(BIOS_067_M300_15_PATH))
|
|
return (rom_present(BIOS_067_M300_15_PATH));
|
|
else
|
|
return (rom_present(BIOS_067_M300_08_PATH));
|
|
}
|
|
|
|
// clang-format off
|
|
static const device_config_t oti067_config[] = {
|
|
{
|
|
.name = "memory",
|
|
.description = "Memory size",
|
|
.type = CONFIG_SELECTION,
|
|
.default_int = 512,
|
|
.selection = {
|
|
{
|
|
.description = "256 kB",
|
|
.value = 256
|
|
},
|
|
{
|
|
.description = "512 kB",
|
|
.value = 512
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.type = CONFIG_END
|
|
}
|
|
};
|
|
|
|
static const device_config_t oti067_ama932j_config[] = {
|
|
{
|
|
.name = "memory",
|
|
.description = "Memory size",
|
|
.type = CONFIG_SELECTION,
|
|
.default_int = 256,
|
|
.selection = {
|
|
{
|
|
.description = "256 kB",
|
|
.value = 256
|
|
},
|
|
{
|
|
.description = "512 kB",
|
|
.value = 512
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.type = CONFIG_END
|
|
}
|
|
};
|
|
|
|
static const device_config_t oti077_config[] = {
|
|
{
|
|
.name = "memory",
|
|
.description = "Memory size",
|
|
.type = CONFIG_SELECTION,
|
|
.default_int = 1024,
|
|
.selection = {
|
|
{
|
|
.description = "256 kB",
|
|
.value = 256
|
|
},
|
|
{
|
|
.description = "512 kB",
|
|
.value = 512
|
|
},
|
|
{
|
|
.description = "1 MB",
|
|
.value = 1024
|
|
},
|
|
{
|
|
.description = ""
|
|
}
|
|
}
|
|
},
|
|
{
|
|
.type = CONFIG_END
|
|
}
|
|
};
|
|
// clang-format on
|
|
|
|
const device_t oti037c_device = {
|
|
.name = "Oak OTI-037C",
|
|
.internal_name = "oti037c",
|
|
.flags = DEVICE_ISA,
|
|
.local = 0,
|
|
.init = oti_init,
|
|
.close = oti_close,
|
|
.reset = NULL,
|
|
{ .available = oti037c_available },
|
|
.speed_changed = oti_speed_changed,
|
|
.force_redraw = oti_force_redraw,
|
|
.config = NULL
|
|
};
|
|
|
|
const device_t oti067_device = {
|
|
.name = "Oak OTI-067",
|
|
.internal_name = "oti067",
|
|
.flags = DEVICE_ISA,
|
|
.local = 2,
|
|
.init = oti_init,
|
|
.close = oti_close,
|
|
.reset = NULL,
|
|
{ .available = oti067_077_available },
|
|
.speed_changed = oti_speed_changed,
|
|
.force_redraw = oti_force_redraw,
|
|
.config = oti067_config
|
|
};
|
|
|
|
const device_t oti067_m300_device = {
|
|
.name = "Oak OTI-067 (Olivetti M300-08/15)",
|
|
.internal_name = "oti067_m300",
|
|
.flags = DEVICE_ISA,
|
|
.local = 4,
|
|
.init = oti_init,
|
|
.close = oti_close,
|
|
.reset = NULL,
|
|
{ .available = oti067_m300_available },
|
|
.speed_changed = oti_speed_changed,
|
|
.force_redraw = oti_force_redraw,
|
|
.config = oti067_config
|
|
};
|
|
|
|
const device_t oti067_ama932j_device = {
|
|
.name = "Oak OTI-067 (AMA-932J)",
|
|
.internal_name = "oti067_ama932j",
|
|
.flags = DEVICE_ISA,
|
|
.local = 3,
|
|
.init = oti_init,
|
|
.close = oti_close,
|
|
.reset = NULL,
|
|
{ .available = oti067_ama932j_available },
|
|
.speed_changed = oti_speed_changed,
|
|
.force_redraw = oti_force_redraw,
|
|
.config = oti067_ama932j_config
|
|
};
|
|
|
|
const device_t oti077_device = {
|
|
.name = "Oak OTI-077",
|
|
.internal_name = "oti077",
|
|
.flags = DEVICE_ISA,
|
|
.local = 5,
|
|
.init = oti_init,
|
|
.close = oti_close,
|
|
.reset = NULL,
|
|
{ .available = oti067_077_available },
|
|
.speed_changed = oti_speed_changed,
|
|
.force_redraw = oti_force_redraw,
|
|
.config = oti077_config
|
|
};
|