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Attempted fix for PS/2 Model 55SX.

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This commit is contained in:
OBattler
2021-12-06 22:33:52 +01:00
parent 8ef7103c04
commit 00e00fa5c6
1 changed files with 10 additions and 8 deletions
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18
src/machine/m_ps2_mca.c
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@@ -432,6 +432,8 @@ static void model_50_write(uint16_t port, uint8_t val)
static void model_55sx_write(uint16_t port, uint8_t val)
{
int remap_size;
switch (port)
{
case 0x100:
@@ -477,26 +479,26 @@ static void model_55sx_write(uint16_t port, uint8_t val)
case 0x105:
ps2_mca_log("Write POS3 %02x\n", val);
ps2.option[3] = val;
shadowbios = !(val & 0x10);
shadowbios_write = val & 0x10;
shadowbios = !(val & 0x10) && !(val & 0x20);
shadowbios_write = (val & 0x10) && !(val & 0x20);
if (shadowbios)
{
mem_set_mem_state(0xe0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_DISABLED);
mem_set_mem_state((mem_size+256) * 1024, 128 * 1024, MEM_READ_EXTANY | MEM_WRITE_EXTANY);
mem_mapping_disable(&ps2.shadow_mapping);
}
else
{
mem_set_mem_state(0xe0000, 0x20000, MEM_READ_EXTANY | MEM_WRITE_INTERNAL);
mem_set_mem_state((mem_size+256) * 1024, 128 * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
mem_set_mem_state(0xe0000, 0x20000, MEM_READ_EXTANY | MEM_WRITE_DISABLED);
mem_mapping_enable(&ps2.shadow_mapping);
}
if ((ps2.option[1] & 1) && !(ps2.option[3] & 0x20))
mem_set_mem_state(mem_size * 1024, 256 * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
remap_size = (val & 0x10) ? 384 : 256;
if (val & 0x20)
mem_set_mem_state(mem_size * 1024, remap_size * 1024, MEM_READ_EXTANY | MEM_WRITE_EXTANY);
else
mem_set_mem_state(mem_size * 1024, 256 * 1024, MEM_READ_EXTANY | MEM_WRITE_EXTANY);
mem_set_mem_state(mem_size * 1024, remap_size * 1024, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
flushmmucache_nopc();
break;