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Implement PPI switch read correctly for IBM PC.

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This commit is contained in:
TomW 2015-10-23 20:40:28 +01:00
commit 774115c6ca
1 changed files with 22 additions and 12 deletions
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34
src/keyboard_xt.c
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@ -98,14 +98,14 @@ uint8_t keyboard_xt_read(uint16_t port, void *priv)
switch (port)
{
case 0x60:
if (keyboard_xt.pb & 0x80)
if ((romset == ROM_IBMPC) && (keyboard_xt.pb & 0x80))
{
if (VGA)
temp = 0x4D;
if (VGA || gfxcard == GFX_EGA)
temp = 0x4D;
else if (MDA)
temp = 0x7D;
temp = 0x7D;
else
temp = 0x6D;
temp = 0x6D;
}
else
{
@ -128,17 +128,27 @@ uint8_t keyboard_xt_read(uint16_t port, void *priv)
break;
case 0x62:
if (keyboard_xt.pb & 0x08)
if (romset == ROM_IBMPC)
{
if (VGA)
temp = 4;
else if (MDA)
temp = 7;
if (keyboard_xt.pb & 0x04)
temp = 0x02;
else
temp = 6;
temp = 0x01;
}
else
temp = 0xD;
{
if (keyboard_xt.pb & 0x08)
{
if (VGA || gfxcard == GFX_EGA)
temp = 4;
else if (MDA)
temp = 7;
else
temp = 6;
}
else
temp = 0xD;
}
temp |= (ppispeakon ? 0x20 : 0);
break;