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mos6526: Fixed port A/B read. [geecab]

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This commit is contained in:
Curt Coder 2015-06-05 09:09:04 +03:00
parent c8976b314b
commit a2cadb6cf7
1 changed files with 8 additions and 2 deletions
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10
src/emu/machine/mos6526.c
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@ -809,12 +809,18 @@ READ8_MEMBER( mos6526_device::read )
switch (offset & 0x0f) switch (offset & 0x0f)
{ {
case PRA: case PRA:
data = (m_read_pa(0) & ~m_ddra) | (m_pra & m_ddra); if (m_ddra != 0xff)
data = (m_read_pa(0) & ~m_ddra) | (m_pra & m_ddra);
else
data = m_read_pa(0) & m_pra;
m_pa_in = data; m_pa_in = data;
break; break;
case PRB: case PRB:
data = (m_read_pb(0) & ~m_ddrb) | (m_prb & m_ddrb); if (m_ddrb != 0xff)
data = (m_read_pb(0) & ~m_ddrb) | (m_prb & m_ddrb);
else
data = m_read_pb(0) & m_prb;
m_pb_in = data; m_pb_in = data;
if (CRA_PBON) if (CRA_PBON)