69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* Copyright holders: Sarah Walker
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see COPYING for more details
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*/
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/*Trident TKD8001 RAMDAC emulation*/
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#include "ibm.h"
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#include "mem.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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static int tkd8001_state=0;
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static uint8_t tkd8001_ctrl;
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void tkd8001_ramdac_out(uint16_t addr, uint8_t val, tkd8001_ramdac_t *ramdac, svga_t *svga)
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{
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// pclog("OUT RAMDAC %04X %02X %04X:%04X\n",addr,val,CS,pc);
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switch (addr)
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{
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case 0x3C6:
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if (ramdac->state == 4)
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{
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ramdac->state = 0;
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ramdac->ctrl = val;
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switch (val >> 5)
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{
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case 0: case 1: case 2: case 3:
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svga->bpp = 8;
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break;
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case 5:
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svga->bpp = 15;
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break;
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case 6:
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svga->bpp = 24;
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break;
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case 7:
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svga->bpp = 16;
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break;
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}
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return;
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}
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// tkd8001_state = 0;
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break;
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case 0x3C7: case 0x3C8: case 0x3C9:
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ramdac->state = 0;
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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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uint8_t tkd8001_ramdac_in(uint16_t addr, tkd8001_ramdac_t *ramdac, svga_t *svga)
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{
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// pclog("IN RAMDAC %04X %04X:%04X\n",addr,CS,pc);
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switch (addr)
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{
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case 0x3C6:
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if (ramdac->state == 4)
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{
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//tkd8001_state = 0;
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return ramdac->ctrl;
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}
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ramdac->state++;
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break;
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case 0x3C7: case 0x3C8: case 0x3C9:
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ramdac->state = 0;
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break;
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}
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return svga_in(addr, svga);
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}
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