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IBM 5550: Change method to store 9th bit into memory

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This commit is contained in:
Akamaki
2026-02-20 09:10:16 +09:00
parent c1661b5a90
commit 45c300a566
1 changed files with 16 additions and 17 deletions
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33
src/machine/m_xt_ibm5550.c
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@@ -1236,7 +1236,7 @@ epoch_vram_writew(uint32_t addr, uint16_t val, void *priv)
// uint8_t convert[8] = {4, 6, 8, 8, 5, 7, 8, 8};/* only odd (0) */
// uint8_t convert[8] = {8, 4, 6, 8, 8, 5, 7, 8};/* none */
// epoch_log("%04X:%04X epoch_vww: %x, val %x DS %x SI %x ES %x DI %x %x\n", cs >> 4, cpu_state.pc, addr, val,DS,SI,ES,DI, epoch->crtc[LC_INTERLACE_AND_SKEW]);
epoch_log("%04X:%04X epoch_vww: %x, val %x cm %x\n", cs >> 4, cpu_state.pc, addr, val, epoch->crtmode);
// epoch_log("%04X:%04X epoch_vww: %x, val %x cm %x\n", cs >> 4, cpu_state.pc, addr, val, epoch->crtmode);
cycles -= video_timing_write_w;
addr -= 0xA0000;
// addr &= 0xfffffffe;
@@ -1291,21 +1291,21 @@ epoch_vram_writew(uint32_t addr, uint16_t val, void *priv)
if (addr & 2)
toaddr--;
if (addr & 0x20000)
toaddr+=2;
toaddr &= 0xdffff;
toaddr += 2;
toaddr &= 0x1ffff;
//addr >>= 1;
epoch_vram_write(toaddr, val & 0xff, epoch);
// epoch_log("%x %x ", toaddr, val);
/* get 9th bit */
bitnum = addr & 0x7;
bitnum = toaddr & 0x7;
toaddr >>= 3;
toaddr += 0x20000; /* real: C0000h */
val >>= 15;
val <<= bitnum;
addr >>= 3;
addr += 0x20000; /* real: C0000h */
val |= epoch_vram_read(addr, epoch) & ~(1 << bitnum);/* mask to update one bit */
epoch_vram_write(addr, val, epoch);
val |= epoch_vram_read(toaddr, epoch) & ~(1 << bitnum);/* mask to update one bit */
epoch_vram_write(toaddr, val, epoch);
// epoch_log("%x %x\n", addr, val);
} else {/* is graphic mode */
epoch_vram_write(addr, val & 0xff, epoch);
@@ -1332,8 +1332,7 @@ epoch_vram_readw(uint32_t addr, void *priv)
// uint8_t convert[8] = {0, 4, 8, 8, 8, 8, 8, 8};/* all but pos+-1 */
cycles -= video_timing_read_w;
addr -= 0xA0000;
epoch_log("%04X:%04X epoch_vrw: %x cm %x\n",
cs >> 4, cpu_state.pc, addr, epoch->crtmode);
// epoch_log("%04X:%04X epoch_vrw: %x cm %x\n", cs >> 4, cpu_state.pc, addr, epoch->crtmode);
// addr &= 0xfffffffe;
//read 0->0,1 2->2,3 4->4,5 6->6,7
//read 0->0,2 2->1,3 4->4,6 6->5,7
@@ -1387,14 +1386,14 @@ epoch_vram_readw(uint32_t addr, void *priv)
if (addr & 2)
toaddr--;
if (addr & 0x20000)
toaddr+=2;
toaddr &= 0xdffff;
toaddr += 2;
toaddr &= 0x1ffff;
ret = epoch_vram_read(toaddr, epoch);
/* get 9th bit */
bitnum = addr & 0x7;
addr >>= 3;
addr += 0x20000; /* real: C0000h */
ret |= (epoch_vram_read(addr, epoch) << (8 + 7 - bitnum)) & 0x8000;
bitnum = toaddr & 0x7;
toaddr >>= 3;
toaddr += 0x20000; /* real: C0000h */
ret |= (epoch_vram_read(toaddr, epoch) << (8 + 7 - bitnum)) & 0x8000;
return ret;
// return epoch_vram_read(addr, epoch) | (epoch_vram_read(addr + 1, epoch) << 8);
} else {/* is graphic mode */
@@ -1806,7 +1805,7 @@ kbd_write(uint16_t port, uint8_t val, void *priv)
timer_process();
speaker_update();
// if(!speaker_enable && (val & 2)) epoch_log("Buz!\n");
speaker_gated = val & 2;
speaker_enable = val & 2;