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Implement Headland fast reset. Fixes AMI 386SX clone.

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This commit is contained in:
SarahW 2017-11-06 22:10:32 +00:00
commit 4c42cc1596
1 changed files with 8 additions and 0 deletions
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8
src/headland.c
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@ -2,6 +2,7 @@
#include "io.h" #include "io.h"
#include "mem.h" #include "mem.h"
#include "cpu.h" #include "cpu.h"
#include "x86.h"
#include "headland.h" #include "headland.h"
@ -12,6 +13,8 @@ void headland_write(uint16_t addr, uint8_t val, void *priv)
{ {
if (addr & 1) if (addr & 1)
{ {
uint8_t old_val = headland_regs[headland_index];
if (headland_index == 0xc1 && !is486) val = 0; if (headland_index == 0xc1 && !is486) val = 0;
headland_regs[headland_index] = val; headland_regs[headland_index] = val;
pclog("Headland write %02X %02X\n",headland_index,val); pclog("Headland write %02X %02X\n",headland_index,val);
@ -24,6 +27,11 @@ void headland_write(uint16_t addr, uint8_t val, void *priv)
else else
mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL); mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL);
} }
else if (headland_index == 0x87)
{
if ((val & 1) && !(old_val & 1))
softresetx86();
}
} }
else else
headland_index = val; headland_index = val;