80486DX2-66/86Box-fork
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Improved the Lucky Star 486 and AMI Apollo NVR hacks.

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This commit is contained in:
OBattler
2020-10-16 23:06:23 +02:00
parent 2c81a8decd
commit ecafe017ab
1 changed files with 16 additions and 3 deletions
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19
src/nvr_at.c
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@@ -671,7 +671,7 @@ nvr_read(uint16_t addr, void *priv)
local_t *local = (local_t *)nvr->data; local_t *local = (local_t *)nvr->data;
uint8_t ret; uint8_t ret;
uint8_t addr_id = (addr & 0x0e) >> 1; uint8_t addr_id = (addr & 0x0e) >> 1;
uint16_t checksum; uint16_t i, checksum = 0x0000;
sub_cycles(ISA_CYCLES(8)); sub_cycles(ISA_CYCLES(8));
@@ -704,7 +704,12 @@ nvr_read(uint16_t addr, void *priv)
case 0x2e: case 0x2e:
case 0x2f: case 0x2f:
if (local->flags & FLAG_LS_HACK) { if (local->flags & FLAG_LS_HACK) {
checksum = ((nvr->regs[0x2e] << 8) | nvr->regs[0x2f]) - (nvr->regs[0x2c] & 0x80); for (i = 0x10; i <= 0x2d; i++) {
if (i == 0x2c)
checksum += (nvr->regs[i] & 0x7f);
else
checksum += nvr->regs[i];
}
if (local->addr[addr_id] == 0x2e) if (local->addr[addr_id] == 0x2e)
ret = checksum >> 8; ret = checksum >> 8;
else else
@@ -716,7 +721,15 @@ nvr_read(uint16_t addr, void *priv)
case 0x3e: case 0x3e:
case 0x3f: case 0x3f:
if (local->flags & FLAG_APOLLO_HACK) { if (local->flags & FLAG_APOLLO_HACK) {
checksum = ((nvr->regs[0x3e] << 8) | nvr->regs[0x3f]) - (nvr->regs[0x52] & 0x0c); /* The checksum at 3E-3F is for 37-3D and 40-7F. */
for (i = 0x37; i <= 0x3d; i++)
checksum += nvr->regs[i];
for (i = 0x40; i <= 0x7f; i++) {
if (i == 0x52)
checksum += (nvr->regs[i] & 0xf3);
else
checksum += nvr->regs[i];
}
if (local->addr[addr_id] == 0x3e) if (local->addr[addr_id] == 0x3e)
ret = checksum >> 8; ret = checksum >> 8;
else else