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Headland: Fix incorrect memory bank handling, fixes Tandy 1000 RSX BIOS hang with 9MB RAM

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win2kgamer
2026-02-09 20:08:06 -06:00
parent ba5e89a996
commit 4bf2bc7bce
1 changed files with 7 additions and 6 deletions
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13
src/chipset/headland.c
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@@ -143,12 +143,12 @@ get_addr(headland_t *dev, uint32_t addr, headland_mr_t *mr)
else if ((addr >= 0xfe0000) && (addr <= 0xffffff))
return addr & 0x0fffff;
if (dev->revision == 8) {
shift = (dev->cr[0] & 0x80) ? 21 : ((dev->cr[6] & 0x01) ? 23 : 19);
other_shift = (dev->cr[0] & 0x80) ? ((dev->cr[6] & 0x01) ? 19 : 23) : 21;
if ((dev->revision == 8) && ((dev->cr[6] & 0x01) == 0x01)) {
shift = (dev->cr[0] & 0x80) ? 21 : ((dev->cr[1] & 0x40) ? 19 : 23);
other_shift = (dev->cr[0] & 0x80) ? 23 : ((dev->cr[1] & 0x40) ? 23 : 23);
} else {
shift = (dev->cr[0] & 0x80) ? 21 : 19;
other_shift = (dev->cr[0] & 0x80) ? 21 : 19;
other_shift = (dev->cr[0] & 0x80) ? 19 : 21;
}
headland_log(dev->log, "Headland shift values: shift = %i, other_shift = %i\n", shift, other_shift);
@@ -158,14 +158,15 @@ get_addr(headland_t *dev, uint32_t addr, headland_mr_t *mr)
bank_base[0] = 0x00000000;
bank_base[1] = bank_base[0] + (1 << shift);
bank_base[2] = bank_base[1] + (1 << shift);
if ((dev->revision > 0) && (dev->revision < 8) && (dev->cr[1] & 0x40)) {
if ((dev->revision > 0) && (dev->cr[1] & 0x40)) {
bank_shift[2] = bank_shift[3] = other_shift;
bank_base[2] = bank_base[1] + (1 << other_shift);
bank_base[3] = bank_base[2] + (1 << other_shift);
/* First address after the memory is bank_base[3] + (1 << other_shift) */
} else {
bank_shift[2] = bank_shift[3] = shift;
bank_base[2] = bank_base[1] + (1 << shift);
bank_base[3] = bank_base[2] + (1 << shift);
/* First address after the memory is bank_base[3] + (1 << shift) */
}