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VL82C48x: Implement ROMSET register ROMMOV/ROMCS# functionality

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win2kgamer
2026-02-18 22:25:38 -06:00
parent e660bc09eb
commit 5e6e81353e
1 changed files with 12 additions and 0 deletions
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12
src/chipset/vl82c480.c
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@@ -77,6 +77,14 @@ vl82c480_recalc_shadow(vl82c480_t *dev)
}
}
/* Implement ROMCS# disable portion of ROMMOV behavior */
if ((dev->regs[0x11] == 0x00) && ((dev->regs[0x0c] & 0x20) || (dev->regs[0x0c] & 0x10)))
mem_set_mem_state(0xe0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
if (!(dev->regs[0x0f] & 0x0f) && !(dev->regs[0x0c] & 0x20)) {
mem_set_mem_state(0xc0000, 0x8000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
if (!(dev->regs[0x0f] & 0xf0) && !((dev->regs[0x0c] & 0x30) == 0x30)) {
mem_set_mem_state(0xc8000, 0x8000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
flushmmucache();
}
@@ -146,6 +154,10 @@ vl82c480_write(uint16_t addr, uint8_t val, void *priv)
case 0x07:
dev->regs[dev->idx] = (dev->regs[dev->idx] & 0x40) | (val & 0xbf);
break;
case 0x0c:
dev->regs[dev->idx] = val;
vl82c480_recalc_shadow(dev);
break;
case 0x0d ... 0x12:
dev->regs[dev->idx] = val;
vl82c480_recalc_shadow(dev);