/*EGA emulation*/ #include #include "ibm.h" #include "device.h" #include "io.h" #include "mem.h" #include "rom.h" #include "timer.h" #include "video.h" #include "vid_ega.h" extern uint8_t edatlookup[4][4]; static uint8_t ega_rotate[8][256]; static uint32_t pallook16[256], pallook64[256]; /*3C2 controls default mode on EGA. On VGA, it determines monitor type (mono or colour)*/ int egaswitchread,egaswitches=9; /*7=CGA mode (200 lines), 9=EGA mode (350 lines), 8=EGA mode (200 lines)*/ static uint8_t mask_gdc[9] = {0x0F, 0x0F, 0x0F, 0x1F, 0x03, 0x3B, 0x0F, 0x0F, 0xFF}; static uint8_t ega_mask_crtc[0x19] = {0xFF, 0xFF, 0xFF, 0x7F, 0xFF, 0xFF, 0xFF, 0x1F, 0x1F, 0x1F, 0x1F, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0xFF, 0xFF, 0x1F, 0xFF, 0x1F, 0x7F, 0xFF}; static uint8_t mask_seq[5] = {0x03, 0x1F, 0x0F, 0x0F, 0x06}; static int old_overscan_color = 0; void ega_out(uint16_t addr, uint8_t val, void *p) { ega_t *ega = (ega_t *)p; int c; uint8_t o, old; if (((addr & 0xfff0) == 0x3d0 || (addr & 0xfff0) == 0x3b0) && !(ega->miscout & 1)) addr ^= 0x60; switch (addr) { case 0x3c0: if (!ega->attrff) { ega->attraddr = val & 31; if ((val & 0x20) != ega->attr_palette_enable) { fullchange = 3; ega->attr_palette_enable = val & 0x20; ega_recalctimings(ega); } } else { o = ega->attrregs[ega->attraddr & 31]; ega->attrregs[ega->attraddr & 31] = val; ega->attrregs[0x11] &= 0x3F; if (ega->attraddr < 16) fullchange = changeframecount; if (ega->attraddr == 0x10 || ega->attraddr == 0x14 || ega->attraddr < 0x10) { for (c = 0; c < 16; c++) { /* if (ega->attrregs[0x10] & 0x80) ega->egapal[c] = (ega->attrregs[c] & 0xf) | ((ega->attrregs[0x14] & 0xf) << 4); else ega->egapal[c] = (ega->attrregs[c] & 0x3f) | ((ega->attrregs[0x14] & 0xc) << 4); */ if (ega->attrregs[0x10] & 0x80) ega->egapal[c] = (ega->attrregs[c] & 0xf) | ((ega->attrregs[0x14] & 0x3) << 4); else ega->egapal[c] = (ega->attrregs[c] & 0x3f); // if ((ega->attrregs[0x10] & 0x40) && gfxcard != GFX_EGA) ega->egapal[c] |= ((ega->attrregs[0x14] & 0xc) << 4); if (gfxcard != GFX_EGA) ega->egapal[c] |= ((ega->attrregs[0x14] & 0xc) << 4); } } if ((ega->attraddr == 0x10) || (ega->attraddr == 0x11)) { if (o != val) ega_recalctimings(ega); } } ega->attrff ^= 1; break; case 0x3c2: egaswitchread = val & 0xc; ega->vres = !(val & 0x80); if (gfxcard == GFX_EGA) ega->pallook = ega->vres ? pallook16 : pallook64; else ega->pallook = pallook64; ega->vidclock = val & 4; /*printf("3C2 write %02X\n",val);*/ ega->enablevram = (val & 2) ? 1 : 0; ega->oddeven_page = (val & 0x20) ? 0 : 1; ega->miscout=val; if (val & 1) { // pclog("Remove mono handler\n"); io_removehandler(0x03a0, 0x0020, ega_in, NULL, NULL, ega_out, NULL, NULL, ega); } else { // pclog("Set mono handler\n"); io_sethandler(0x03a0, 0x0020, ega_in, NULL, NULL, ega_out, NULL, NULL, ega); } ega_recalctimings(ega); break; case 0x3c4: ega->seqaddr = val; break; case 0x3c5: if (ega->seqaddr <= 4) val &= mask_seq[ega->seqaddr]; o = ega->seqregs[ega->seqaddr & 0xf]; ega->seqregs[ega->seqaddr & 0xf] = val; if (o != val && (ega->seqaddr & 0xf) == 1) ega_recalctimings(ega); switch (ega->seqaddr & 0xf) { case 1: if (ega->scrblank && !(val & 0x20)) fullchange = 3; ega->scrblank = (ega->scrblank & ~0x20) | (val & 0x20); break; case 2: ega->writemask = val & 0xf; break; case 3: ega->charsetb = (((val >> 2) & 3) * 0x10000) + 2; ega->charseta = ((val & 3) * 0x10000) + 2; break; case 4: ega->chain2_write = !(val & 4); break; } break; case 0x3ce: ega->gdcaddr = val; break; case 0x3cf: if (ega->seqaddr <= 8) val &= mask_gdc[ega->gdcaddr]; ega->gdcreg[ega->gdcaddr & 15] = val; switch (ega->gdcaddr & 15) { case 2: ega->colourcompare = val; break; case 4: ega->readplane = val & 3; break; case 5: ega->writemode = val & 3; ega->readmode = val & 8; ega->chain2_read = val & 0x10; break; case 6: // pclog("Write mapping %02X\n", val); switch (val & 0xc) { case 0x0: /*128k at A0000*/ mem_mapping_set_addr(&ega->mapping, 0xa0000, 0x20000); break; case 0x4: /*64k at A0000*/ mem_mapping_set_addr(&ega->mapping, 0xa0000, 0x10000); break; case 0x8: /*32k at B0000*/ mem_mapping_set_addr(&ega->mapping, 0xb0000, 0x08000); break; case 0xC: /*32k at B8000*/ mem_mapping_set_addr(&ega->mapping, 0xb8000, 0x08000); break; } break; case 7: ega->colournocare = val; break; } break; case 0x3d4: // pclog("Write 3d4 %02X %04X:%04X\n", val, CS, cpu_state.pc); ega->crtcreg = val & 31; return; case 0x3d5: // pclog("Write 3d5 %02X %02X %02X\n", ega->crtcreg, val, ega->crtc[0x11]); // if (ega->crtcreg == 1 && val == 0x14) // fatal("Here\n"); if (ega->crtcreg <= 0x18) val &= ega_mask_crtc[ega->crtcreg]; if (ega->crtcreg <= 7 && ega->crtc[0x11] & 0x80) return; old = ega->crtc[ega->crtcreg]; ega->crtc[ega->crtcreg] = val; if (old != val) { if (ega->crtcreg < 0xe || ega->crtcreg > 0x10) { fullchange = changeframecount; ega_recalctimings(ega); } } break; } } uint8_t ega_in(uint16_t addr, void *p) { ega_t *ega = (ega_t *)p; /* if (addr != 0x3da && addr != 0x3ba) pclog("ega_in %04X\n", addr); */ if (((addr & 0xfff0) == 0x3d0 || (addr & 0xfff0) == 0x3b0) && !(ega->miscout & 1)) addr ^= 0x60; switch (addr) { case 0x3c0: return ega->attraddr; case 0x3c1: if (ega->attraddr == 0x10) return ((ega->attrregs[ega->attraddr] & 0x7F) | (ega->attrff << 7)); return ega->attrregs[ega->attraddr]; case 0x3c2: // printf("Read egaswitch %02X %02X %i\n",egaswitchread,egaswitches,VGA); switch (egaswitchread) { case 0xc: return (egaswitches & 1) ? 0x10 : 0; case 0x8: return (egaswitches & 2) ? 0x10 : 0; case 0x4: return (egaswitches & 4) ? 0x10 : 0; case 0x0: return (egaswitches & 8) ? 0x10 : 0; } break; case 0x3c4: return ega->seqaddr; case 0x3c5: return ega->seqregs[ega->seqaddr & 0xf]; case 0x3ce: return ega->gdcaddr; case 0x3cf: if (ega->gdcaddr == 0xF8) return ega->la; if (ega->gdcaddr == 0xF9) return ega->lb; if (ega->gdcaddr == 0xFA) return ega->lc; if (ega->gdcaddr == 0xFB) return ega->ld; return ega->gdcreg[ega->gdcaddr & 0xf]; case 0x3d4: return ega->crtcreg; case 0x3d5: return ega->crtc[ega->crtcreg]; case 0x3da: ega->attrff = 0; // ega->stat ^= 0x30; /*Fools IBM EGA video BIOS self-test*/ if (ega->stat & 0x01) ega->stat &= ~0x30; else ega->stat ^= 0x30; return ega->stat; } // printf("Bad EGA read %04X %04X:%04X\n",addr,cs>>4,cpu_state.pc); return 0xff; } void ega_recalctimings(ega_t *ega) { double _dispontime, _dispofftime, disptime; double crtcconst; ega->vtotal = ega->crtc[6]; ega->dispend = ega->crtc[0x12]; ega->vsyncstart = ega->crtc[0x10]; ega->split = ega->crtc[0x18]; ega->vblankstart = ega->crtc[0x15]; if (ega->crtc[7] & 1) ega->vtotal |= 0x100; ega->vtotal++; if (ega->crtc[7] & 2) ega->dispend |= 0x100; ega->dispend++; if (ega->crtc[7] & 4) ega->vsyncstart |= 0x100; ega->vsyncstart++; if (ega->crtc[7] & 0x10) ega->split |= 0x100; ega->split+=2; if (ega->crtc[7] & 0x08) ega->vblankstart |= 0x100; ega->vblankstart++; ega->hdisp = ega->crtc[1]; ega->hdisp++; ega->rowoffset = ega->crtc[0x13]; // printf("Recalc! %i %i %i %i %i %02X\n", ega->vtotal, ega->dispend, ega->vsyncstart, ega->split, ega->hdisp, ega->attrregs[0x16]); if (ega->vblankstart < ega->dispend) ega->dispend = ega->vblankstart; if (ega->vidclock) crtcconst = (ega->seqregs[1] & 1) ? MDACONST : (MDACONST * (9.0 / 8.0)); else crtcconst = (ega->seqregs[1] & 1) ? CGACONST : (CGACONST * (9.0 / 8.0)); disptime = ega->crtc[0] + 2; _dispontime = ega->hdisp; // printf("Disptime %f dispontime %f hdisp %i\n",disptime,dispontime,crtc[1]*8); if (ega->seqregs[1] & 8) { disptime *= 2; _dispontime *= 2; } _dispofftime = disptime - _dispontime; _dispontime *= crtcconst; _dispofftime *= crtcconst; ega->dispontime = (int)(_dispontime * (1 << TIMER_SHIFT)); ega->dispofftime = (int)(_dispofftime * (1 << TIMER_SHIFT)); /* pclog("dispontime %i (%f) dispofftime %i (%f)\n", ega->dispontime, (float)ega->dispontime / (1 << TIMER_SHIFT), ega->dispofftime, (float)ega->dispofftime / (1 << TIMER_SHIFT)); */ // printf("EGA horiz total %i display end %i clock rate %i vidclock %i %i\n",crtc[0],crtc[1],egaswitchread,vidclock,((ega3c2>>2)&3) | ((tridentnewctrl2<<2)&4)); // printf("EGA vert total %i display end %i max row %i vsync %i\n",ega_vtotal,ega_dispend,(crtc[9]&31)+1,ega_vsyncstart); // printf("total %f on %f cycles off %f cycles frame %f sec %f %02X\n",disptime*crtcconst,dispontime,dispofftime,(dispontime+dispofftime)*ega_vtotal,(dispontime+dispofftime)*ega_vtotal*70,seqregs[1]); } void ega_poll(void *p) { ega_t *ega = (ega_t *)p; uint8_t chr, dat, attr; uint32_t charaddr; int x, xx; uint32_t fg, bg; int offset; uint8_t edat[4]; int drawcursor = 0; int y_add = enable_overscan ? 14 : 0; int x_add = enable_overscan ? 8 : 0; int y_add_ex = enable_overscan ? 28 : 0; int x_add_ex = enable_overscan ? 16 : 0; uint32_t *q, *r, i, j; if (!ega->linepos) { ega->vidtime += ega->dispofftime; ega->stat |= 1; ega->linepos = 1; if (ega->dispon) { if (ega->firstline == 2000) ega->firstline = ega->displine; if (ega->scrblank) { for (x = 0; x < ega->hdisp; x++) { switch (ega->seqregs[1] & 9) { case 0: for (xx = 0; xx < 9; xx++) ((uint32_t *)buffer32->line[ega->displine + y_add])[(x * 9) + xx + 32 + x_add] = 0; break; case 1: for (xx = 0; xx < 8; xx++) ((uint32_t *)buffer32->line[ega->displine + y_add])[(x * 8) + xx + 32 + x_add] = 0; break; case 8: for (xx = 0; xx < 18; xx++) ((uint32_t *)buffer32->line[ega->displine + y_add])[(x * 18) + xx + 32 + x_add] = 0; break; case 9: for (xx = 0; xx < 16; xx++) ((uint32_t *)buffer32->line[ega->displine + y_add])[(x * 16) + xx + 32 + x_add] = 0; break; } } } else if (!ega->scrblank && ega->attr_palette_enable) { if (!(ega->gdcreg[6] & 1)) { if (fullchange) { for (x = 0; x < ega->hdisp; x++) { drawcursor = ((ega->ma == ega->ca) && ega->con && ega->cursoron); chr = ega->vram[ega->ma << 1]; attr = ega->vram[(ega->ma << 1) + 1]; if (attr & 8) charaddr = ega->charsetb + (chr * 128); else charaddr = ega->charseta + (chr * 128); if (drawcursor) { bg = ega->pallook[ega->egapal[attr & 15]]; fg = ega->pallook[ega->egapal[attr >> 4]]; } else { fg = ega->pallook[ega->egapal[attr & 15]]; bg = ega->pallook[ega->egapal[attr >> 4]]; if (attr & 0x80 && ega->attrregs[0x10] & 8) { bg = ega->pallook[ega->egapal[(attr >> 4) & 7]]; if (ega->blink & 16) fg = bg; } } dat = ega->vram[charaddr + (ega->sc << 2)]; if (ega->seqregs[1] & 8) { if (ega->seqregs[1] & 1) { for (xx = 0; xx < 8; xx++) ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x << 4) + 32 + (xx << 1)) & 2047) + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x << 4) + 33 + (xx << 1)) & 2047) + x_add] = (dat & (0x80 >> xx)) ? fg : bg; } else { for (xx = 0; xx < 8; xx++) ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 18) + 32 + (xx << 1)) & 2047) + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 18) + 33 + (xx << 1)) & 2047) + x_add] = (dat & (0x80 >> xx)) ? fg : bg; if ((chr & ~0x1f) != 0xc0 || !(ega->attrregs[0x10] & 4)) ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 18) + 32 + 16) & 2047) + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 18) + 32 + 17) & 2047) + x_add] = bg; else ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 18) + 32 + 16) & 2047) + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 18) + 32 + 17) & 2047) + x_add] = (dat & 1) ? fg : bg; } } else { if (ega->seqregs[1] & 1) { for (xx = 0; xx < 8; xx++) ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x << 3) + 32 + xx) & 2047) + x_add] = (dat & (0x80 >> xx)) ? fg : bg; } else { for (xx = 0; xx < 8; xx++) ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 9) + 32 + xx) & 2047) + x_add] = (dat & (0x80 >> xx)) ? fg : bg; if ((chr & ~0x1f) != 0xc0 || !(ega->attrregs[0x10] & 4)) ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 9) + 32 + 8) & 2047) + x_add] = bg; else ((uint32_t *)buffer32->line[ega->displine + y_add])[(((x * 9) + 32 + 8) & 2047) + x_add] = (dat & 1) ? fg : bg; } } ega->ma += 4; ega->ma &= ega->vrammask; } } } else { switch (ega->gdcreg[5] & 0x20) { case 0x00: if (ega->seqregs[1] & 8) { offset = ((8 - ega->scrollcache) << 1) + 16; for (x = 0; x <= ega->hdisp; x++) { if (ega->sc & 1 && !(ega->crtc[0x17] & 1)) { edat[0] = ega->vram[ega->ma | 0x8000]; edat[1] = ega->vram[ega->ma | 0x8001]; edat[2] = ega->vram[ega->ma | 0x8002]; edat[3] = ega->vram[ega->ma | 0x8003]; } else { edat[0] = ega->vram[ega->ma]; edat[1] = ega->vram[ega->ma | 0x1]; edat[2] = ega->vram[ega->ma | 0x2]; edat[3] = ega->vram[ega->ma | 0x3]; } ega->ma += 4; ega->ma &= ega->vrammask; dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2); ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 14 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 15 + offset + x_add] = ega->pallook[ega->egapal[(dat & 0xf) & ega->attrregs[0x12]]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 12 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 13 + offset + x_add] = ega->pallook[ega->egapal[(dat >> 4) & ega->attrregs[0x12]]]; dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2); ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 10 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 11 + offset + x_add] = ega->pallook[ega->egapal[(dat & 0xf) & ega->attrregs[0x12]]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 8 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 9 + offset + x_add] = ega->pallook[ega->egapal[(dat >> 4) & ega->attrregs[0x12]]]; dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2); ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 6 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 7 + offset + x_add] = ega->pallook[ega->egapal[(dat & 0xf) & ega->attrregs[0x12]]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 4 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 5 + offset + x_add] = ega->pallook[ega->egapal[(dat >> 4) & ega->attrregs[0x12]]]; dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2); ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 2 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 3 + offset + x_add] = ega->pallook[ega->egapal[(dat & 0xf) & ega->attrregs[0x12]]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 1 + offset + x_add] = ega->pallook[ega->egapal[(dat >> 4) & ega->attrregs[0x12]]]; } } else { offset = (8 - ega->scrollcache) + 24; for (x = 0; x <= ega->hdisp; x++) { if (ega->sc & 1 && !(ega->crtc[0x17] & 1)) { edat[0] = ega->vram[ega->ma | 0x8000]; edat[1] = ega->vram[ega->ma | 0x8001]; edat[2] = ega->vram[ega->ma | 0x8002]; edat[3] = ega->vram[ega->ma | 0x8003]; } else { edat[0] = ega->vram[ega->ma]; edat[1] = ega->vram[ega->ma | 0x1]; edat[2] = ega->vram[ega->ma | 0x2]; edat[3] = ega->vram[ega->ma | 0x3]; } ega->ma += 4; ega->ma &= ega->vrammask; dat = edatlookup[edat[0] & 3][edat[1] & 3] | (edatlookup[edat[2] & 3][edat[3] & 3] << 2); ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 3) + 7 + offset + x_add] = ega->pallook[ega->egapal[(dat & 0xf) & ega->attrregs[0x12]]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 3) + 6 + offset + x_add] = ega->pallook[ega->egapal[(dat >> 4) & ega->attrregs[0x12]]]; dat = edatlookup[(edat[0] >> 2) & 3][(edat[1] >> 2) & 3] | (edatlookup[(edat[2] >> 2) & 3][(edat[3] >> 2) & 3] << 2); ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 3) + 5 + offset + x_add] = ega->pallook[ega->egapal[(dat & 0xf) & ega->attrregs[0x12]]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 3) + 4 + offset + x_add] = ega->pallook[ega->egapal[(dat >> 4) & ega->attrregs[0x12]]]; dat = edatlookup[(edat[0] >> 4) & 3][(edat[1] >> 4) & 3] | (edatlookup[(edat[2] >> 4) & 3][(edat[3] >> 4) & 3] << 2); ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 3) + 3 + offset + x_add] = ega->pallook[ega->egapal[(dat & 0xf) & ega->attrregs[0x12]]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 3) + 2 + offset + x_add] = ega->pallook[ega->egapal[(dat >> 4) & ega->attrregs[0x12]]]; dat = edatlookup[edat[0] >> 6][edat[1] >> 6] | (edatlookup[edat[2] >> 6][edat[3] >> 6] << 2); ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 3) + 1 + offset + x_add] = ega->pallook[ega->egapal[(dat & 0xf) & ega->attrregs[0x12]]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 3) + offset + x_add] = ega->pallook[ega->egapal[(dat >> 4) & ega->attrregs[0x12]]]; } } break; case 0x20: offset = ((8 - ega->scrollcache) << 1) + 16; for (x = 0; x <= ega->hdisp; x++) { if (ega->sc & 1 && !(ega->crtc[0x17] & 1)) { edat[0] = ega->vram[(ega->ma << 1) + 0x8000]; edat[1] = ega->vram[(ega->ma << 1) + 0x8001]; } else { edat[0] = ega->vram[(ega->ma << 1)]; edat[1] = ega->vram[(ega->ma << 1) + 1]; } ega->ma += 4; ega->ma &= ega->vrammask; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 14 + offset + x_add]= ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 15 + offset + x_add] = ega->pallook[ega->egapal[edat[1] & 3]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 12 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 13 + offset + x_add] = ega->pallook[ega->egapal[(edat[1] >> 2) & 3]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 10 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 11 + offset + x_add] = ega->pallook[ega->egapal[(edat[1] >> 4) & 3]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 8 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 9 + offset + x_add] = ega->pallook[ega->egapal[(edat[1] >> 6) & 3]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 6 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 7 + offset + x_add] = ega->pallook[ega->egapal[(edat[0] >> 0) & 3]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 4 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 5 + offset + x_add] = ega->pallook[ega->egapal[(edat[0] >> 2) & 3]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 2 + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 3 + offset + x_add] = ega->pallook[ega->egapal[(edat[0] >> 4) & 3]]; ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + offset + x_add] = ((uint32_t *)buffer32->line[ega->displine + y_add])[(x << 4) + 1 + offset + x_add] = ega->pallook[ega->egapal[(edat[0] >> 6) & 3]]; } break; } } } if (ega->lastline < ega->displine) ega->lastline = ega->displine; } ega->displine++; if ((ega->stat & 8) && ((ega->displine & 15) == (ega->crtc[0x11] & 15)) && ega->vslines) ega->stat &= ~8; ega->vslines++; if (ega->displine > 500) ega->displine = 0; } else { ega->vidtime += ega->dispontime; // if (output) printf("Display on %f\n",vidtime); if (ega->dispon) ega->stat &= ~1; ega->linepos = 0; if (ega->sc == (ega->crtc[11] & 31)) ega->con = 0; if (ega->dispon) { if (ega->sc == (ega->crtc[9] & 31)) { ega->sc = 0; ega->maback += (ega->rowoffset << 3); ega->maback &= ega->vrammask; ega->ma = ega->maback; } else { ega->sc++; ega->sc &= 31; ega->ma = ega->maback; } } ega->vc++; ega->vc &= 1023; // printf("Line now %i %i ma %05X\n",vc,displine,ma); if (ega->vc == ega->split) { // printf("Split at line %i %i\n",displine,vc); ega->ma = ega->maback = 0; if (ega->attrregs[0x10] & 0x20) ega->scrollcache = 0; } if (ega->vc == ega->dispend) { // printf("Display over at line %i %i\n",displine,vc); ega->dispon=0; if (ega->crtc[10] & 0x20) ega->cursoron = 0; else ega->cursoron = ega->blink & 16; if (!(ega->gdcreg[6] & 1) && !(ega->blink & 15)) fullchange = 2; ega->blink++; if (fullchange) fullchange--; } if (ega->vc == ega->vsyncstart) { int wx = 0; int wy = 0; ega->dispon = 0; // printf("Vsync on at line %i %i\n",displine,vc); ega->stat |= 8; if (ega->seqregs[1] & 8) x = ega->hdisp * ((ega->seqregs[1] & 1) ? 8 : 9) * 2; else x = ega->hdisp * ((ega->seqregs[1] & 1) ? 8 : 9); // pclog("Cursor %02X %02X\n",crtc[10],crtc[11]); // pclog("Firstline %i Lastline %i wx %i %i\n",firstline,lastline,wx,oddeven); // doblit(); if (x != xsize || (ega->lastline - ega->firstline) != ysize) { xsize = x; ysize = ega->lastline - ega->firstline; if (xsize < 64) xsize = 640; if (ysize < 32) ysize = 200; if (ega->vres) updatewindowsize(xsize + x_add_ex, (ysize << 1) + y_add_ex); else updatewindowsize(xsize + x_add_ex, ysize + y_add_ex); } startblit(); if (enable_overscan) { if ((x >= 160) && ((ega->lastline - ega->firstline) >= 120)) { for (i = 0; i < 14; i++) { q = &((uint32_t *)buffer32->line[i])[32]; r = &((uint32_t *)buffer32->line[ysize + y_add_ex - 1 - i])[32]; for (j = 0; j < (xsize + x_add_ex); j++) { q[j] = ega->pallook[ega->attrregs[0x11]]; r[j] = ega->pallook[ega->attrregs[0x11]]; } } for (i = 14; i < (ysize + 14); i ++) { q = &((uint32_t *)buffer32->line[i])[32]; for (j = 0; j < 8; j++) { q[j] = ega->pallook[ega->attrregs[0x11]]; q[xsize + x_add_ex - 1 - j] = ega->pallook[ega->attrregs[0x11]]; } } } } video_blit_memtoscreen(32, 0, ega->firstline, ega->lastline + y_add_ex, xsize + x_add_ex, ega->lastline - ega->firstline + y_add_ex); endblit(); frames++; ega->video_res_x = wx; ega->video_res_y = wy + 1; if (!(ega->gdcreg[6] & 1)) /*Text mode*/ { ega->video_res_x /= (ega->seqregs[1] & 1) ? 8 : 9; ega->video_res_y /= (ega->crtc[9] & 31) + 1; ega->video_bpp = 0; } else { if (ega->crtc[9] & 0x80) ega->video_res_y /= 2; if (!(ega->crtc[0x17] & 1)) ega->video_res_y *= 2; ega->video_res_y /= (ega->crtc[9] & 31) + 1; if (ega->seqregs[1] & 8) ega->video_res_x /= 2; ega->video_bpp = (ega->gdcreg[5] & 0x20) ? 2 : 4; } // wakeupblit(); readflash=0; //framecount++; ega->firstline = 2000; ega->lastline = 0; ega->maback = ega->ma = (ega->crtc[0xc] << 8)| ega->crtc[0xd]; ega->ca = (ega->crtc[0xe] << 8) | ega->crtc[0xf]; ega->ma <<= 2; ega->maback <<= 2; ega->ca <<= 2; changeframecount = 2; ega->vslines = 0; } if (ega->vc == ega->vtotal) { ega->vc = 0; ega->sc = 0; ega->dispon = 1; ega->displine = 0; ega->scrollcache = ega->attrregs[0x13] & 7; } if (ega->sc == (ega->crtc[10] & 31)) ega->con = 1; } } void ega_write(uint32_t addr, uint8_t val, void *p) { ega_t *ega = (ega_t *)p; uint8_t vala, valb, valc, vald; int writemask2 = ega->writemask; uint32_t raddr = addr; int plane, mask; egawrites++; cycles -= video_timing_b; cycles_lost += video_timing_b; /* Horrible hack, I know, but it's the only way to fix the 440FX BIOS filling the VRAM with garbage until Tom fixes the memory emulation. */ if ((cs == 0xE0000) && (cpu_state.pc == 0xBF2F) && (romset == ROM_440FX)) return; if ((cs == 0xE0000) && (cpu_state.pc == 0xBF77) && (romset == ROM_440FX)) return; if (addr >= 0xB0000) addr &= 0x7fff; else addr &= 0xffff; if (ega->chain2_write) { plane = (addr & 1) | (ega->oddeven_page ? 2 : 0); mask = (1 << plane); if (ega->seqregs[2] & mask) { addr = (((addr & ~1) | ega->oddeven_chain) << 2) | plane; if ((!ega->extvram) && (addr >= 0x10000)) return; if (addr >= 0x40000) return; if ((raddr <= 0xA0000) || (raddr >= 0xBFFFF)) return; ega->vram[addr] = val; } return; } addr <<= 2; if (!(ega->gdcreg[6] & 1)) fullchange = 2; // pclog("%i %08X %i %i %02X %02X %02X %02X %02X\n",chain4,addr,writemode,writemask,gdcreg[8],vram[0],vram[1],vram[2],vram[3]); switch (ega->writemode) { case 1: if (writemask2 & 1) ega->vram[addr] = ega->la; if (writemask2 & 2) ega->vram[addr | 0x1] = ega->lb; if (writemask2 & 4) ega->vram[addr | 0x2] = ega->lc; if (writemask2 & 8) ega->vram[addr | 0x3] = ega->ld; break; case 0: if (ega->gdcreg[3] & 7) val = ega_rotate[ega->gdcreg[3] & 7][val]; if (ega->gdcreg[8] == 0xff && !(ega->gdcreg[3] & 0x18) && !ega->gdcreg[1]) { if (writemask2 & 1) ega->vram[addr] = val; if (writemask2 & 2) ega->vram[addr | 0x1] = val; if (writemask2 & 4) ega->vram[addr | 0x2] = val; if (writemask2 & 8) ega->vram[addr | 0x3] = val; } else { if (ega->gdcreg[1] & 1) vala = (ega->gdcreg[0] & 1) ? 0xff : 0; else vala = val; if (ega->gdcreg[1] & 2) valb = (ega->gdcreg[0] & 2) ? 0xff : 0; else valb = val; if (ega->gdcreg[1] & 4) valc = (ega->gdcreg[0] & 4) ? 0xff : 0; else valc = val; if (ega->gdcreg[1] & 8) vald = (ega->gdcreg[0] & 8) ? 0xff : 0; else vald = val; // pclog("Write %02X %01X %02X %02X %02X %02X %02X\n",gdcreg[3]&0x18,writemask,vala,valb,valc,vald,gdcreg[8]); switch (ega->gdcreg[3] & 0x18) { case 0: /*Set*/ if (writemask2 & 1) ega->vram[addr] = (vala & ega->gdcreg[8]) | (ega->la & ~ega->gdcreg[8]); if (writemask2 & 2) ega->vram[addr | 0x1] = (valb & ega->gdcreg[8]) | (ega->lb & ~ega->gdcreg[8]); if (writemask2 & 4) ega->vram[addr | 0x2] = (valc & ega->gdcreg[8]) | (ega->lc & ~ega->gdcreg[8]); if (writemask2 & 8) ega->vram[addr | 0x3] = (vald & ega->gdcreg[8]) | (ega->ld & ~ega->gdcreg[8]); break; case 8: /*AND*/ if (writemask2 & 1) ega->vram[addr] = (vala | ~ega->gdcreg[8]) & ega->la; if (writemask2 & 2) ega->vram[addr | 0x1] = (valb | ~ega->gdcreg[8]) & ega->lb; if (writemask2 & 4) ega->vram[addr | 0x2] = (valc | ~ega->gdcreg[8]) & ega->lc; if (writemask2 & 8) ega->vram[addr | 0x3] = (vald | ~ega->gdcreg[8]) & ega->ld; break; case 0x10: /*OR*/ if (writemask2 & 1) ega->vram[addr] = (vala & ega->gdcreg[8]) | ega->la; if (writemask2 & 2) ega->vram[addr | 0x1] = (valb & ega->gdcreg[8]) | ega->lb; if (writemask2 & 4) ega->vram[addr | 0x2] = (valc & ega->gdcreg[8]) | ega->lc; if (writemask2 & 8) ega->vram[addr | 0x3] = (vald & ega->gdcreg[8]) | ega->ld; break; case 0x18: /*XOR*/ if (writemask2 & 1) ega->vram[addr] = (vala & ega->gdcreg[8]) ^ ega->la; if (writemask2 & 2) ega->vram[addr | 0x1] = (valb & ega->gdcreg[8]) ^ ega->lb; if (writemask2 & 4) ega->vram[addr | 0x2] = (valc & ega->gdcreg[8]) ^ ega->lc; if (writemask2 & 8) ega->vram[addr | 0x3] = (vald & ega->gdcreg[8]) ^ ega->ld; break; } // pclog("- %02X %02X %02X %02X %08X\n",vram[addr],vram[addr|0x1],vram[addr|0x2],vram[addr|0x3],addr); } break; case 2: if (!(ega->gdcreg[3] & 0x18) && !ega->gdcreg[1]) { if (writemask2 & 1) ega->vram[addr] = (((val & 1) ? 0xff : 0) & ega->gdcreg[8]) | (ega->la & ~ega->gdcreg[8]); if (writemask2 & 2) ega->vram[addr | 0x1] = (((val & 2) ? 0xff : 0) & ega->gdcreg[8]) | (ega->lb & ~ega->gdcreg[8]); if (writemask2 & 4) ega->vram[addr | 0x2] = (((val & 4) ? 0xff : 0) & ega->gdcreg[8]) | (ega->lc & ~ega->gdcreg[8]); if (writemask2 & 8) ega->vram[addr | 0x3] = (((val & 8) ? 0xff : 0) & ega->gdcreg[8]) | (ega->ld & ~ega->gdcreg[8]); } else { vala = ((val & 1) ? 0xff : 0); valb = ((val & 2) ? 0xff : 0); valc = ((val & 4) ? 0xff : 0); vald = ((val & 8) ? 0xff : 0); switch (ega->gdcreg[3] & 0x18) { case 0: /*Set*/ if (writemask2 & 1) ega->vram[addr] = (vala & ega->gdcreg[8]) | (ega->la & ~ega->gdcreg[8]); if (writemask2 & 2) ega->vram[addr | 0x1] = (valb & ega->gdcreg[8]) | (ega->lb & ~ega->gdcreg[8]); if (writemask2 & 4) ega->vram[addr | 0x2] = (valc & ega->gdcreg[8]) | (ega->lc & ~ega->gdcreg[8]); if (writemask2 & 8) ega->vram[addr | 0x3] = (vald & ega->gdcreg[8]) | (ega->ld & ~ega->gdcreg[8]); break; case 8: /*AND*/ if (writemask2 & 1) ega->vram[addr] = (vala | ~ega->gdcreg[8]) & ega->la; if (writemask2 & 2) ega->vram[addr | 0x1] = (valb | ~ega->gdcreg[8]) & ega->lb; if (writemask2 & 4) ega->vram[addr | 0x2] = (valc | ~ega->gdcreg[8]) & ega->lc; if (writemask2 & 8) ega->vram[addr | 0x3] = (vald | ~ega->gdcreg[8]) & ega->ld; break; case 0x10: /*OR*/ if (writemask2 & 1) ega->vram[addr] = (vala & ega->gdcreg[8]) | ega->la; if (writemask2 & 2) ega->vram[addr | 0x1] = (valb & ega->gdcreg[8]) | ega->lb; if (writemask2 & 4) ega->vram[addr | 0x2] = (valc & ega->gdcreg[8]) | ega->lc; if (writemask2 & 8) ega->vram[addr | 0x3] = (vald & ega->gdcreg[8]) | ega->ld; break; case 0x18: /*XOR*/ if (writemask2 & 1) ega->vram[addr] = (vala & ega->gdcreg[8]) ^ ega->la; if (writemask2 & 2) ega->vram[addr | 0x1] = (valb & ega->gdcreg[8]) ^ ega->lb; if (writemask2 & 4) ega->vram[addr | 0x2] = (valc & ega->gdcreg[8]) ^ ega->lc; if (writemask2 & 8) ega->vram[addr | 0x3] = (vald & ega->gdcreg[8]) ^ ega->ld; break; } } break; } } uint8_t ega_read(uint32_t addr, void *p) { ega_t *ega = (ega_t *)p; uint8_t temp, temp2, temp3, temp4; int readplane = ega->readplane; int plane; egareads++; cycles -= video_timing_b; cycles_lost += video_timing_b; // pclog("Readega %06X ",addr); if (addr >= 0xb0000) addr &= 0x7fff; else addr &= 0xffff; if (ega->chain2_read) { plane = (addr & 1) | (ega->oddeven_page ? 2 : 0); addr = (((addr & ~1) | ega->oddeven_chain) << 2) | plane; if ((!ega->extvram) && (addr >= 0x10000)) return 0xff; if (addr >= 0x40000) return 0xff; return ega->vram[addr]; } addr <<= 2; ega->la = ega->vram[addr]; ega->lb = ega->vram[addr | 0x1]; ega->lc = ega->vram[addr | 0x2]; ega->ld = ega->vram[addr | 0x3]; if (ega->readmode) { temp = (ega->colournocare & 1) ? 0xff : 0; temp &= ega->la; temp ^= (ega->colourcompare & 1) ? 0xff : 0; temp2 = (ega->colournocare & 2) ? 0xff : 0; temp2 &= ega->lb; temp2 ^= (ega->colourcompare & 2) ? 0xff : 0; temp3 = (ega->colournocare & 4) ? 0xff : 0; temp3 &= ega->lc; temp3 ^= (ega->colourcompare & 4) ? 0xff : 0; temp4 = (ega->colournocare & 8) ? 0xff : 0; temp4 &= ega->ld; temp4 ^= (ega->colourcompare & 8) ? 0xff : 0; return ~(temp | temp2 | temp3 | temp4); } return ega->vram[addr | readplane]; } void ega_init(ega_t *ega) { int c, d, e; ega->vram = malloc(0x40000); ega->vrammask = 0x3ffff; for (c = 0; c < 256; c++) { e = c; for (d = 0; d < 8; d++) { ega_rotate[d][c] = e; e = (e >> 1) | ((e & 1) ? 0x80 : 0); } } for (c = 0; c < 4; c++) { for (d = 0; d < 4; d++) { edatlookup[c][d] = 0; if (c & 1) edatlookup[c][d] |= 1; if (d & 1) edatlookup[c][d] |= 2; if (c & 2) edatlookup[c][d] |= 0x10; if (d & 2) edatlookup[c][d] |= 0x20; } } for (c = 0; c < 256; c++) { pallook64[c] = makecol32(((c >> 2) & 1) * 0xaa, ((c >> 1) & 1) * 0xaa, (c & 1) * 0xaa); pallook64[c] += makecol32(((c >> 5) & 1) * 0x55, ((c >> 4) & 1) * 0x55, ((c >> 3) & 1) * 0x55); pallook16[c] = makecol32(((c >> 2) & 1) * 0xaa, ((c >> 1) & 1) * 0xaa, (c & 1) * 0xaa); pallook16[c] += makecol32(((c >> 4) & 1) * 0x55, ((c >> 4) & 1) * 0x55, ((c >> 4) & 1) * 0x55); if ((c & 0x17) == 6) pallook16[c] = makecol32(0xaa, 0x55, 0); } ega->pallook = pallook16; } void ega_common_defaults(ega_t *ega) { ega->miscout |= 0x22; ega->enablevram = 1; ega->oddeven_page = 0; ega->seqregs[4] |= 2; ega->extvram = 1; } void *ega_standalone_init() { int c, d, e; ega_t *ega = malloc(sizeof(ega_t)); memset(ega, 0, sizeof(ega_t)); overscan_x = 16; overscan_y = 28; rom_init(&ega->bios_rom, "roms/ibm_6277356_ega_card_u44_27128.bin", 0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL); if (ega->bios_rom.rom[0x3ffe] == 0xaa && ega->bios_rom.rom[0x3fff] == 0x55) { int c; for (c = 0; c < 0x2000; c++) { uint8_t temp = ega->bios_rom.rom[c]; ega->bios_rom.rom[c] = ega->bios_rom.rom[0x3fff - c]; ega->bios_rom.rom[0x3fff - c] = temp; } } ega->crtc[0] = 63; ega->dispontime = 1000 * (1 << TIMER_SHIFT); ega->dispofftime = 1000 * (1 << TIMER_SHIFT); ega->dispontime <<= 1; ega->dispofftime <<= 1; ega_init(ega); ega_common_defaults(ega); mem_mapping_add(&ega->mapping, 0xa0000, 0x20000, ega_read, NULL, NULL, ega_write, NULL, NULL, NULL, 0, ega); timer_add(ega_poll, &ega->vidtime, TIMER_ALWAYS_ENABLED, ega); vramp = ega->vram; io_sethandler(0x03c0, 0x0020, ega_in, NULL, NULL, ega_out, NULL, NULL, ega); return ega; } void *cpqega_standalone_init() { int c, d, e; ega_t *ega = malloc(sizeof(ega_t)); memset(ega, 0, sizeof(ega_t)); overscan_x = 16; overscan_y = 28; rom_init(&ega->bios_rom, "roms/108281-001.bin", 0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL); if (ega->bios_rom.rom[0x3ffe] == 0xaa && ega->bios_rom.rom[0x3fff] == 0x55) { int c; // pclog("Read EGA ROM in reverse\n"); for (c = 0; c < 0x2000; c++) { uint8_t temp = ega->bios_rom.rom[c]; ega->bios_rom.rom[c] = ega->bios_rom.rom[0x3fff - c]; ega->bios_rom.rom[0x3fff - c] = temp; } } ega->crtc[0] = 63; // ega->crtc[6] = 255; ega->dispontime = 1000 * (1 << TIMER_SHIFT); ega->dispofftime = 1000 * (1 << TIMER_SHIFT); ega_init(ega); // ega->attrregs[0x10] |= 0xF7; ega_common_defaults(ega); mem_mapping_add(&ega->mapping, 0xa0000, 0x20000, ega_read, NULL, NULL, ega_write, NULL, NULL, NULL, 0, ega); timer_add(ega_poll, &ega->vidtime, TIMER_ALWAYS_ENABLED, ega); vramp = ega->vram; // io_sethandler(0x03a0, 0x0040, ega_in, NULL, NULL, ega_out, NULL, NULL, ega); io_sethandler(0x03c0, 0x0020, ega_in, NULL, NULL, ega_out, NULL, NULL, ega); return ega; } void *sega_standalone_init() { int c, d, e; ega_t *ega = malloc(sizeof(ega_t)); memset(ega, 0, sizeof(ega_t)); overscan_x = 16; overscan_y = 28; rom_init(&ega->bios_rom, "roms/lega.vbi", 0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL); if (ega->bios_rom.rom[0x3ffe] == 0xaa && ega->bios_rom.rom[0x3fff] == 0x55) { int c; // pclog("Read EGA ROM in reverse\n"); for (c = 0; c < 0x2000; c++) { uint8_t temp = ega->bios_rom.rom[c]; ega->bios_rom.rom[c] = ega->bios_rom.rom[0x3fff - c]; ega->bios_rom.rom[0x3fff - c] = temp; } } ega->crtc[0] = 63; // ega->crtc[6] = 255; ega->dispontime = 1000 * (1 << TIMER_SHIFT); ega->dispofftime = 1000 * (1 << TIMER_SHIFT); ega_init(ega); // ega->attrregs[0x10] |= 0xF7; ega_common_defaults(ega); mem_mapping_add(&ega->mapping, 0xa0000, 0x20000, ega_read, NULL, NULL, ega_write, NULL, NULL, NULL, 0, ega); timer_add(ega_poll, &ega->vidtime, TIMER_ALWAYS_ENABLED, ega); vramp = ega->vram; // io_sethandler(0x03a0, 0x0040, ega_in, NULL, NULL, ega_out, NULL, NULL, ega); io_sethandler(0x03c0, 0x0020, ega_in, NULL, NULL, ega_out, NULL, NULL, ega); return ega; } static int ega_standalone_available() { return rom_present("roms/ibm_6277356_ega_card_u44_27128.bin"); } static int cpqega_standalone_available() { return rom_present("roms/108281-001.bin"); } static int sega_standalone_available() { return rom_present("roms/lega.vbi"); } void ega_close(void *p) { ega_t *ega = (ega_t *)p; free(ega->vram); free(ega); } void ega_speed_changed(void *p) { ega_t *ega = (ega_t *)p; ega_recalctimings(ega); } device_t ega_device = { "EGA", 0, ega_standalone_init, ega_close, ega_standalone_available, ega_speed_changed, NULL, NULL }; device_t cpqega_device = { "Compaq EGA", 0, cpqega_standalone_init, ega_close, cpqega_standalone_available, ega_speed_changed, NULL, NULL }; device_t sega_device = { "SuperEGA", 0, sega_standalone_init, ega_close, sega_standalone_available, ega_speed_changed, NULL, NULL };