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apple2: fix parallel card ACK handling, Print Shop almost works with the lx810l now. [R. Belmont]

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This commit is contained in:
arbee 2016-01-31 17:59:41 -05:00
parent b1eaf63758
commit b3e74085fe
1 changed files with 17 additions and 3 deletions
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20
src/devices/bus/a2bus/a2pic.cpp
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@ -49,11 +49,11 @@ static INPUT_PORTS_START( pic )
PORT_DIPSETTING( 0x06, "13 microseconds" )
PORT_DIPSETTING( 0x07, "15 microseconds" )
PORT_DIPNAME( 0x08, 0x00, "Strobe polarity (SW4)" )
PORT_DIPNAME( 0x08, 0x08, "Strobe polarity (SW4)" )
PORT_DIPSETTING( 0x00, "Positive" )
PORT_DIPSETTING( 0x08, "Negative" )
PORT_DIPNAME( 0x10, 0x00, "Acknowledge polarity (SW5)" )
PORT_DIPNAME( 0x10, 0x10, "Acknowledge polarity (SW5)" )
PORT_DIPSETTING( 0x00, "Positive" )
PORT_DIPSETTING( 0x10, "Negative" )
@ -181,13 +181,27 @@ UINT8 a2bus_pic_device::read_cnxx(address_space &space, UINT8 offset)
UINT8 a2bus_pic_device::read_c0nx(address_space &space, UINT8 offset)
{
UINT8 rv = 0;
switch (offset)
{
case 3:
return m_ctx_data_in->read();
case 4:
return m_ack;
rv = m_ack;
// clear flip-flop
if (m_dsw1->read() & 0x10) // negative polarity
{
m_ack |= 0x80;
}
else
{
m_ack &= ~0x80;
}
return rv;
case 6: // does reading this really work?
m_irqenable = true;