97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/* Copyright holders: Sarah Walker, Tenshi
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see COPYING for more details
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*/
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/*It is unknown exactly what RAMDAC this is
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It is possibly a Sierra 1502x
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It's addressed by the TLIVESA1 driver for ET4000*/
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/* Note by Tenshi: Not possibly, this *IS* a Sierra 1502x. */
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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_unk_ramdac.h"
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void unk_ramdac_out(uint16_t addr, uint8_t val, unk_ramdac_t *ramdac, svga_t *svga)
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{
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// pclog("OUT RAMDAC %04X %02X\n",addr,val);
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int oldbpp = 0;
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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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if (val == 0xFF) break;
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ramdac->ctrl = val;
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oldbpp = svga->bpp;
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switch ((val&1)|((val&0xC0)>>5))
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{
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case 0:
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svga->bpp = 8;
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break;
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case 2: case 3:
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switch (val & 0x20)
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{
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case 0x00: svga->bpp = 32; break;
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case 0x20: svga->bpp = 24; break;
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}
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break;
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case 4: 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 = 16;
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break;
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case 7:
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switch (val & 4)
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{
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case 4:
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switch (val & 0x20)
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{
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case 0x00: svga->bpp = 32; break;
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case 0x20: svga->bpp = 24; break;
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}
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break;
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case 0: default:
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svga->bpp = 16;
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break;
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}
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case 1: default:
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break;
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}
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if (oldbpp != svga->bpp)
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{
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svga_recalctimings(svga);
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}
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// pclog("unk_ramdac: set to %02X (b5 = %i) [%02X], %i bpp\n", (val&1)|((val&0xC0)>>5), val & 0x20 ? 1 : 0, val, svga->bpp);
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return;
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}
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ramdac->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 unk_ramdac_in(uint16_t addr, unk_ramdac_t *ramdac, svga_t *svga)
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{
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// pclog("IN RAMDAC %04X\n",addr);
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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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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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