393 lines
13 KiB
C
393 lines
13 KiB
C
/* Copyright holders: Sarah Walker, SA1988
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see COPYING for more details
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*/
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/*Trident TVGA (8900D) emulation*/
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#include <stdlib.h>
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#include "ibm.h"
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#include "device.h"
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#include "io.h"
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#include "mem.h"
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#include "rom.h"
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#include "video.h"
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#include "vid_svga.h"
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#include "vid_svga_render.h"
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#include "vid_tkd8001_ramdac.h"
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#include "vid_tvga.h"
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typedef struct tvga_t
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{
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mem_mapping_t linear_mapping;
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mem_mapping_t accel_mapping;
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svga_t svga;
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tkd8001_ramdac_t ramdac;
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rom_t bios_rom;
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uint8_t tvga_3d8, tvga_3d9;
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int oldmode;
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uint8_t oldctrl1;
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uint8_t oldctrl2, newctrl2;
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int vram_size;
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uint32_t vram_mask;
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} tvga_t;
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static uint8_t crtc_mask[0x40] =
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{
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0x7f, 0xff, 0x3f, 0x7f, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xef,
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0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
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0x7f, 0x00, 0x00, 0x2f, 0x00, 0x00, 0x00, 0x03,
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0x00, 0x13, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 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 void tvga_recalcbanking(tvga_t *tvga);
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void tvga_out(uint16_t addr, uint8_t val, void *p)
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{
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tvga_t *tvga = (tvga_t *)p;
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svga_t *svga = &tvga->svga;
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uint8_t old;
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// pclog("tvga_out : %04X %02X %04X:%04X %i\n", addr, val, CS,pc, svga->bpp);
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if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout & 1)) addr ^= 0x60;
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switch (addr)
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{
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case 0x3C5:
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switch (svga->seqaddr & 0xf)
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{
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case 0xB:
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tvga->oldmode=1;
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break;
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case 0xC:
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if (svga->seqregs[0xe] & 0x80)
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svga->seqregs[0xc] = val;
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break;
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case 0xd:
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if (tvga->oldmode)
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tvga->oldctrl2 = val;
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else
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{
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tvga->newctrl2 = val;
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svga_recalctimings(svga);
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}
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break;
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case 0xE:
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if (tvga->oldmode)
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tvga->oldctrl1 = val;
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else
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{
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svga->seqregs[0xe] = val ^ 2;
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tvga->tvga_3d8 = svga->seqregs[0xe] & 0xf;
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tvga_recalcbanking(tvga);
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}
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return;
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}
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break;
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case 0x3C6: case 0x3C7: case 0x3C8: case 0x3C9:
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tkd8001_ramdac_out(addr, val, &tvga->ramdac, svga);
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return;
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case 0x3CF:
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switch (svga->gdcaddr & 15)
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{
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case 0xE:
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svga->gdcreg[0xe] = val ^ 2;
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tvga->tvga_3d9 = svga->gdcreg[0xe] & 0xf;
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tvga_recalcbanking(tvga);
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break;
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case 0xF:
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svga->gdcreg[0xf] = val;
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tvga_recalcbanking(tvga);
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break;
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}
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break;
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case 0x3D4:
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svga->crtcreg = val & 0x3f;
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return;
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case 0x3D5:
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if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
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return;
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if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
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val = (svga->crtc[7] & ~0x10) | (val & 0x10);
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old = svga->crtc[svga->crtcreg];
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val &= crtc_mask[svga->crtcreg];
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svga->crtc[svga->crtcreg] = val;
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// if (svga->crtcreg != 0xC && svga->crtcreg != 0xE && svga->crtcreg != 0xF) pclog("CRTC R%02X = %02X %04X:%04X\n", svga->crtcreg, val, CS, pc);
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if (old != val)
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{
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if (svga->crtcreg < 0xE || svga->crtcreg > 0x10)
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{
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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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switch (svga->crtcreg)
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{
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case 0x1e:
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svga->vrammask = (val & 0x80) ? tvga->vram_mask : 0x3ffff;
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break;
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}
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return;
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case 0x3D8:
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if (svga->gdcreg[0xf] & 4)
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{
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tvga->tvga_3d8 = val;
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tvga_recalcbanking(tvga);
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}
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return;
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case 0x3D9:
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if (svga->gdcreg[0xf] & 4)
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{
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tvga->tvga_3d9 = val;
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tvga_recalcbanking(tvga);
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}
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return;
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}
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svga_out(addr, val, svga);
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}
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uint8_t tvga_in(uint16_t addr, void *p)
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{
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tvga_t *tvga = (tvga_t *)p;
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svga_t *svga = &tvga->svga;
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// if (addr != 0x3da) pclog("tvga_in : %04X %04X:%04X\n", addr, CS,pc);
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if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout & 1)) addr ^= 0x60;
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switch (addr)
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{
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case 0x3C5:
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if ((svga->seqaddr & 0xf) == 0xb)
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{
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// printf("Read Trident ID %04X:%04X %04X\n",CS,pc,readmemw(ss,SP));
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tvga->oldmode = 0;
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return 0x33; /*TVGA8900D*/
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}
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if ((svga->seqaddr & 0xf) == 0xc)
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{
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// printf("Read Trident Power Up 1 %04X:%04X %04X\n",CS,pc,readmemw(ss,SP));
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// return 0x20; /*2 DRAM banks*/
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}
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if ((svga->seqaddr & 0xf) == 0xd)
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{
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if (tvga->oldmode) return tvga->oldctrl2;
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return tvga->newctrl2;
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}
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if ((svga->seqaddr & 0xf) == 0xe)
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{
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if (tvga->oldmode)
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return tvga->oldctrl1;
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}
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break;
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case 0x3C6: case 0x3C7: case 0x3C8: case 0x3C9:
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return tkd8001_ramdac_in(addr, &tvga->ramdac, svga);
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case 0x3D4:
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return svga->crtcreg;
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case 0x3D5:
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if (svga->crtcreg > 0x18 && svga->crtcreg < 0x1e)
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return 0xff;
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return svga->crtc[svga->crtcreg];
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case 0x3d8:
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return tvga->tvga_3d8;
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case 0x3d9:
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return tvga->tvga_3d9;
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}
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return svga_in(addr, svga);
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}
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static void tvga_recalcbanking(tvga_t *tvga)
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{
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svga_t *svga = &tvga->svga;
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svga->write_bank = (tvga->tvga_3d8 & 0x1f) * 65536;
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if (svga->gdcreg[0xf] & 1)
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svga->read_bank = (tvga->tvga_3d9 & 0x1f) * 65536;
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else
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svga->read_bank = svga->write_bank;
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// pclog("recalcbanking: write_bank=%08x read_bank=%08x GDC[E]=%02x GDC[F]=%02x SEQ[E]=%02x 3d8=%02x 3d9=%02x\n", svga->read_bank, svga->write_bank, svga->gdcreg[0xe], svga->gdcreg[0xf], svga->seqregs[0xe], tvga->tvga_3d8, tvga->tvga_3d9);
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}
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void tvga_recalctimings(svga_t *svga)
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{
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tvga_t *tvga = (tvga_t *)svga->p;
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if (!svga->rowoffset) svga->rowoffset = 0x100; /*This is the only sensible way I can see this being handled,
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given that TVGA8900D has no overflow bits.
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Some sort of overflow is required for 320x200x24 and 1024x768x16*/
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if (svga->crtc[0x29] & 0x10)
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svga->rowoffset += 0x100;
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if (svga->bpp == 24)
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svga->hdisp = (svga->crtc[1] + 1) * 8;
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if ((svga->crtc[0x1e] & 0xA0) == 0xA0) svga->ma_latch |= 0x10000;
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if ((svga->crtc[0x27] & 0x01) == 0x01) svga->ma_latch |= 0x20000;
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if ((svga->crtc[0x27] & 0x02) == 0x02) svga->ma_latch |= 0x40000;
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if (tvga->oldctrl2 & 0x10)
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{
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svga->rowoffset <<= 1;
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svga->ma_latch <<= 1;
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}
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if (svga->gdcreg[0xf] & 0x08)
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{
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svga->htotal *= 2;
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svga->hdisp *= 2;
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svga->hdisp_time *= 2;
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}
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// svga->interlace = svga->crtc[0x1e] & 4;
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if (svga->crtc[0x1e] & 4)
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{
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svga->rowoffset >>= 1;
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svga->vtotal *= 2;
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svga->dispend *= 2;
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svga->vblankstart *= 2;
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svga->vsyncstart *= 2;
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svga->split *= 2;
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}
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switch (((svga->miscout >> 2) & 3) | ((tvga->newctrl2 << 2) & 4))
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{
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case 2: svga->clock = cpuclock/44900000.0; break;
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case 3: svga->clock = cpuclock/36000000.0; break;
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case 4: svga->clock = cpuclock/57272000.0; break;
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case 5: svga->clock = cpuclock/65000000.0; break;
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case 6: svga->clock = cpuclock/50350000.0; break;
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case 7: svga->clock = cpuclock/40000000.0; break;
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}
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if (tvga->oldctrl2 & 0x10)
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{
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switch (svga->bpp)
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{
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case 8:
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svga->render = svga_render_8bpp_highres;
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break;
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case 15:
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svga->render = svga_render_15bpp_highres;
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svga->hdisp /= 2;
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break;
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case 16:
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svga->render = svga_render_16bpp_highres;
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svga->hdisp /= 2;
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break;
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case 24:
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svga->render = svga_render_24bpp_highres;
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svga->hdisp /= 3;
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break;
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}
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svga->lowres = 0;
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}
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}
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void *tvga8900d_init()
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{
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tvga_t *tvga = malloc(sizeof(tvga_t));
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memset(tvga, 0, sizeof(tvga_t));
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tvga->vram_size = device_get_config_int("memory") << 10;
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tvga->vram_mask = tvga->vram_size - 1;
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rom_init(&tvga->bios_rom, "roms/TRIDENT.BIN", 0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
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svga_init(&tvga->svga, tvga, tvga->vram_size,
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tvga_recalctimings,
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tvga_in, tvga_out,
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NULL,
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NULL);
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io_sethandler(0x03c0, 0x0020, tvga_in, NULL, NULL, tvga_out, NULL, NULL, tvga);
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return tvga;
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}
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static int tvga8900d_available()
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{
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return rom_present("roms/TRIDENT.BIN");
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}
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void tvga_close(void *p)
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{
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tvga_t *tvga = (tvga_t *)p;
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svga_close(&tvga->svga);
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free(tvga);
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}
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void tvga_speed_changed(void *p)
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{
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tvga_t *tvga = (tvga_t *)p;
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svga_recalctimings(&tvga->svga);
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}
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void tvga_force_redraw(void *p)
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{
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tvga_t *tvga = (tvga_t *)p;
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tvga->svga.fullchange = changeframecount;
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}
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void tvga_add_status_info(char *s, int max_len, void *p)
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{
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tvga_t *tvga = (tvga_t *)p;
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svga_add_status_info(s, max_len, &tvga->svga);
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}
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static device_config_t tvga_config[] =
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{
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{
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.name = "memory",
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.description = "Memory size",
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.type = CONFIG_SELECTION,
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.selection =
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{
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{
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.description = "256 kB",
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.value = 256
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},
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{
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.description = "512 kB",
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.value = 512
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},
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{
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.description = "1 MB",
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.value = 1024
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},
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/*Chip supports 2mb, but drivers are buggy*/
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{
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.description = ""
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}
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},
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.default_int = 1024
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},
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{
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.type = -1
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}
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};
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device_t tvga8900d_device =
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{
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"Trident TVGA 8900D",
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0,
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tvga8900d_init,
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tvga_close,
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tvga8900d_available,
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tvga_speed_changed,
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tvga_force_redraw,
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tvga_add_status_info,
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tvga_config
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};
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