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simplified read_port + make sure portc is 6 bits wide (meyc8088.c expects d6,7 to be set on read)

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This commit is contained in:
Michaël Banaan Ananas 2012-04-30 19:37:30 +00:00
parent a91bbaade8
commit 8c8b37b75a
1 changed files with 11 additions and 28 deletions
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39
src/emu/machine/i8155.c
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@ -159,36 +159,19 @@ inline UINT8 i8155_device::read_port(int port)
{
UINT8 data = 0;
switch (port)
switch (get_port_mode(port))
{
case PORT_A:
case PORT_B:
switch (get_port_mode(port))
{
case PORT_MODE_INPUT:
data = m_in_port_func[port](0);
break;
case PORT_MODE_OUTPUT:
data = m_output[port];
break;
}
case PORT_MODE_INPUT:
data = m_in_port_func[port](0);
break;
case PORT_C:
switch (get_port_mode(PORT_C))
{
case PORT_MODE_INPUT:
data = m_in_port_func[port](0) & 0x3f;
break;
case PORT_MODE_OUTPUT:
data = m_output[port];
break;
case PORT_MODE_OUTPUT:
data = m_output[port] & 0x3f;
break;
default:
logerror("8155 '%s' Unsupported Port C mode!\n", tag());
}
default:
// strobed mode not implemented yet
logerror("8155 '%s' Unsupported Port C mode!\n", tag());
break;
}
@ -404,7 +387,7 @@ READ8_MEMBER( i8155_device::io_r )
break;
case REGISTER_PORT_C:
data = read_port(PORT_C);
data = read_port(PORT_C) | 0xc0;
break;
case REGISTER_TIMER_LOW:
@ -501,7 +484,7 @@ void i8155_device::register_w(int offset, UINT8 data)
break;
case REGISTER_PORT_C:
write_port(PORT_C, data);
write_port(PORT_C, data & 0x3f);
break;
case REGISTER_TIMER_LOW: