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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| #include "fc1004.h" | ||
| #include "vram.h" | ||
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| extern fc1004_t ym; | ||
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| vram_input_t vram_input, vram_input_o; | ||
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| static int vram[64 * 1024]; | ||
| static int vram_flat[64 * 1024]; | ||
| static int vram_page[256]; | ||
| static int vram_addr; | ||
| static int vram_dt; | ||
| static int vram_addr_ser; | ||
| static int vram_ser; | ||
| static int vram_addr_o; | ||
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| void update_vram() | ||
| { | ||
| int cas, wr, rd, owr, ord; | ||
| int odata; | ||
| int ocas; | ||
| // o_vram_ras | ||
| // o_vram_cas | ||
| // o_vram_we0 | ||
| // o_vram_oe1 | ||
| // o_vram_sc | ||
| // o_vram_se0 | ||
| vram_input.ras = ym.vdp.o_vram_ras; | ||
| vram_input.cas = ym.vdp.o_vram_cas; | ||
| vram_input.we0 = ym.vdp.o_vram_we0; | ||
| vram_input.oe1 = ym.vdp.o_vram_oe1; | ||
| vram_input.sc = ym.vdp.o_vram_sc; | ||
| vram_input.se0 = ym.vdp.o_vram_se0; | ||
| vram_input.ad = ym.vdp.o_vram_ad; | ||
| if (!memcmp(&vram_input, &vram_input_o, sizeof(vram_input))) | ||
| return; | ||
| cas = !vram_input.ras && !vram_input.cas; | ||
| wr = !vram_input.ras && !vram_input.cas && !vram_input.we0; | ||
| rd = !vram_input.ras && !vram_input.cas && !vram_input.oe1 && !vram_dt; | ||
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| odata = vram_input.ad; | ||
| if (vram_dt) | ||
| { | ||
| if (!vram_input_o.oe1 && vram_input.oe1) | ||
| { | ||
| int unscramble = 0; | ||
| vram_addr_ser = vram_addr; | ||
| unscramble |= vram_addr & 3; | ||
| unscramble |= (vram_addr >> 6) & 0x3fc; | ||
| unscramble |= (vram_addr & 0xfc) << 8; | ||
| memcpy(vram_page, &vram[vram_addr & 0xff00], sizeof(vram_page)); | ||
| //vram_ser = vram_page[vram_addr_ser & 0xff]; | ||
| //if (ym.vdp.l106[1] > 320) | ||
| // printf("dt %x\n", unscramble); | ||
| } | ||
| } | ||
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| if (vram_input_o.ras && !vram_input.ras) | ||
| { | ||
| vram_dt = !vram_input.oe1; | ||
| vram_addr &= ~0xff00; | ||
| vram_addr |= (odata & 255) << 8; | ||
| } | ||
| ocas = !vram_input_o.ras && !vram_input_o.cas; | ||
| if (!ocas && cas) | ||
| { | ||
| vram_addr &= ~0xff; | ||
| vram_addr |= odata & 255; | ||
| } | ||
| owr = !vram_input_o.ras && !vram_input_o.cas && !vram_input_o.we0; | ||
| if (!owr && wr) | ||
| { | ||
| int unscramble = 0; | ||
| vram[vram_addr] = odata; | ||
| unscramble |= vram_addr & 3; | ||
| unscramble |= (vram_addr >> 6) & 0x3fc; | ||
| unscramble |= (vram_addr & 0xfc) << 8; | ||
| vram_flat[unscramble] = odata; | ||
| if (unscramble == 0xc20 && odata != 0) | ||
| unscramble += 0; | ||
| } | ||
| ord = !vram_input_o.ras && !vram_input_o.cas && !vram_input_o.oe1 && !vram_dt; | ||
| if (!ord && rd) | ||
| { | ||
| ym.vdp.input.i_vram_ad = vram[vram_addr & 0xffff]; | ||
| } | ||
| if (!vram_input_o.sc && vram_input.sc && !vram_input.se0) | ||
| { | ||
| int low, high; | ||
| int unscramble = 0; | ||
| unscramble |= vram_addr_ser & 3; | ||
| unscramble |= (vram_addr_ser >> 6) & 0x3fc; | ||
| unscramble |= (vram_addr_ser & 0xfc) << 8; | ||
| vram_ser = vram_page[vram_addr_ser & 0xff]; | ||
| if (unscramble >= 0x3800 && (unscramble & 3) == 1) | ||
| { | ||
| vram_ser ^= 0; | ||
| } | ||
| low = vram_addr_ser & 255; | ||
| high = vram_addr_ser & 0xff00; | ||
| low++; | ||
| low &= 255; | ||
| vram_addr_ser = high | low; | ||
| } | ||
| if (!vram_input.se0) | ||
| { | ||
| ym.vdp.input.i_vram_sd = vram_ser; | ||
| } | ||
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| vram_input_o = vram_input; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
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| #pragma once | ||
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| typedef struct { | ||
| int ras; | ||
| int cas; | ||
| int we0; | ||
| int oe1; | ||
| int sc; | ||
| int se0; | ||
| int ad; | ||
| } vram_input_t; | ||
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| void update_vram(); |