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Don't enable SCAT shadow RAM if SCAT configured for less than 1 MB of

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low memory. Fixes Hyundai Super-286TR with 1 MB RAM configured.
This commit is contained in:
SarahW 2020-11-15 13:44:23 +00:00
commit 142301adbf
1 changed files with 13 additions and 3 deletions
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16
src/scat.c
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@ -78,10 +78,19 @@ void scat_shadow_state_update()
{ {
int i, val; int i, val;
for (i = 0; i < 24; i++) if ((scat_regs[SCAT_DRAM_CONFIGURATION] & 0xF) < 4)
{ {
val = ((scat_regs[SCAT_SHADOW_RAM_ENABLE_1 + (i >> 3)] >> (i & 7)) & 1) ? MEM_READ_INTERNAL | MEM_WRITE_INTERNAL : MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL; /*Less than 1MB low memory, no shadow RAM available*/
mem_set_mem_state((i + 40) << 14, 0x4000, val); for (i = 0; i < 24; i++)
mem_set_mem_state((i + 40) << 14, 0x4000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
}
else
{
for (i = 0; i < 24; i++)
{
val = ((scat_regs[SCAT_SHADOW_RAM_ENABLE_1 + (i >> 3)] >> (i & 7)) & 1) ? MEM_READ_INTERNAL | MEM_WRITE_INTERNAL : MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL;
mem_set_mem_state((i + 40) << 14, 0x4000, val);
}
} }
flushmmucache(); flushmmucache();
@ -1043,6 +1052,7 @@ void scat_write(uint16_t port, uint8_t val, void *priv)
break; break;
case SCAT_DRAM_CONFIGURATION: case SCAT_DRAM_CONFIGURATION:
scat_map_update = 1; scat_map_update = 1;
scat_shadow_update = 1;
if((scat_regs[SCAT_VERSION] & 0xF0) == 0) if((scat_regs[SCAT_VERSION] & 0xF0) == 0)
{ {