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Disable FDC when enabling W83877TF config registers at 0x3f0, to prevent bus conflicts. Fixes duplicate FDC/COM/LPT ports on VA-503+.

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This commit is contained in:
SarahW 2019-05-17 20:15:09 +01:00
commit 60058283eb
1 changed files with 9 additions and 0 deletions
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9
src/w83877tf.c
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@ -138,12 +138,21 @@ static void w83877tf_write_3fx(uint16_t port, uint8_t val, void *p)
{
case 0x3f0: /*Enable/index register*/
if (val == 0xaa)
{
fdc_remove();
if (w83877tf->enable_regs && w83877tf->regs[0x20] >= 0x40)
fdc_add();
w83877tf->enable_regs = 0;
}
else if (!w83877tf->enable_regs)
{
w83877tf->key[1] = w83877tf->key[0];
w83877tf->key[0] = val;
w83877tf->enable_regs = (w83877tf->key[0] == 0x87 && w83877tf->key[1] == 0x87);
/*The FDC conflicts with the 3fx config registers, so disable
it when enabling config registers*/
if (w83877tf->enable_regs)
fdc_remove();
}
else
w83877tf->index = val;