Add v0.7 source
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TomW
commit
3c253c2cf8
188 changed files with 52566 additions and 0 deletions
199
src/vid_tvga.c
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199
src/vid_tvga.c
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/*Trident TVGA (8900D) emulation*/
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#include "ibm.h"
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#include "video.h"
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#include "vid_svga.h"
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#include "vid_tkd8001_ramdac.h"
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uint8_t trident3d8,trident3d9;
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int tridentoldmode;
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uint8_t tridentoldctrl2,tridentnewctrl2;
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uint8_t tridentdac;
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void tvga_out(uint16_t addr, uint8_t val)
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{
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uint8_t old;
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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 (seqaddr&0xF)
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{
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case 0xB: tridentoldmode=1; break;
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case 0xC: if (seqregs[0xE]&0x80) seqregs[0xC]=val; break;
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case 0xD: if (tridentoldmode) { tridentoldctrl2=val; rowdbl=val&0x10; } else tridentnewctrl2=val; break;
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case 0xE:
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seqregs[0xE]=val^2;
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svgawbank=(seqregs[0xE]&0xF)*65536;
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if (!(gdcreg[0xF]&1)) svgarbank=svgawbank;
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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);
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return;
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case 0x3CF:
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switch (gdcaddr&15)
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{
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case 0xE:
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gdcreg[0xE]=val^2;
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if ((gdcreg[0xF]&1)==1)
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svgarbank=(gdcreg[0xE]&0xF)*65536;
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break;
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case 0xF:
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if (val&1) svgarbank=(gdcreg[0xE] &0xF)*65536;
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else svgarbank=(seqregs[0xE]&0xF)*65536;
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svgawbank=(seqregs[0xE]&0xF)*65536;
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break;
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}
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break;
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case 0x3D4:
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crtcreg=val&63;
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return;
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case 0x3D5:
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if (crtcreg <= 7 && crtc[0x11] & 0x80) return;
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old=crtc[crtcreg];
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crtc[crtcreg]=val;
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//if (crtcreg!=0xE && crtcreg!=0xF) pclog("CRTC R%02X = %02X\n",crtcreg,val);
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if (old!=val)
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{
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if (crtcreg<0xE || crtcreg>0x10)
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{
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fullchange=changeframecount;
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svga_recalctimings();
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}
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}
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return;
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case 0x3D8:
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trident3d8=val;
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if (gdcreg[0xF]&4)
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{
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svgawbank=(val&0x1F)*65536;
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// pclog("SVGAWBANK 3D8 %08X %04X:%04X\n",svgawbank,CS,pc);
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if (!(gdcreg[0xF]&1))
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{
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svgarbank=(val&0x1F)*65536;
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// pclog("SVGARBANK 3D8 %08X %04X:%04X\n",svgarbank,CS,pc);
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}
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}
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return;
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case 0x3D9:
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trident3d9=val;
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if ((gdcreg[0xF]&5)==5)
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{
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svgarbank=(val&0x1F)*65536;
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// pclog("SVGARBANK 3D9 %08X %04X:%04X\n",svgarbank,CS,pc);
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}
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return;
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}
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svga_out(addr,val);
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}
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uint8_t tvga_in(uint16_t addr)
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{
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uint8_t temp;
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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 ((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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tridentoldmode=0;
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return 0x33; /*TVGA8900D*/
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}
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if ((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 ((seqaddr&0xF)==0xD)
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{
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if (tridentoldmode) return tridentoldctrl2;
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return tridentnewctrl2;
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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);
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case 0x3CD: /*Banking*/
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return svgaseg;
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case 0x3D4:
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return crtcreg;
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case 0x3D5:
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return crtc[crtcreg];
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}
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return svga_in(addr);
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}
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void tvga_recalctimings()
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{
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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 ((crtc[0x1E]&0xA0)==0xA0) svga_ma|=0x10000;
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if ((crtc[0x27]&0x01)==0x01) svga_ma|=0x20000;
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if ((crtc[0x27]&0x02)==0x02) svga_ma|=0x40000;
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if (tridentoldctrl2 & 0x10)
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{
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svga_rowoffset<<=1;
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svga_ma<<=1;
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}
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if (tridentoldctrl2 & 0x10) /*I'm not convinced this is the right register for this function*/
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svga_lowres=0;
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if (gdcreg[0xF] & 8)
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{
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svga_htotal<<=1;
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svga_hdisp<<=1;
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}
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svga_interlace = crtc[0x1E] & 4;
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if (svga_interlace)
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svga_rowoffset >>= 1;
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switch (((svga_miscout>>2)&3) | ((tridentnewctrl2<<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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}
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int tvga_init()
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{
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svga_recalctimings_ex = tvga_recalctimings;
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svga_vram_limit = 1 << 20; /*1mb - chip supports 2mb, but drivers are buggy*/
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vrammask = 0xfffff;
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return svga_init();
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}
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GFXCARD vid_tvga =
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{
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tvga_init,
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/*IO at 3Cx/3Dx*/
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tvga_out,
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tvga_in,
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/*IO at 3Ax/3Bx*/
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video_out_null,
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video_in_null,
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svga_poll,
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svga_recalctimings,
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svga_write,
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video_write_null,
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video_write_null,
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svga_read,
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video_read_null,
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video_read_null
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};
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