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mm78la: small fix with carry flag

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This commit is contained in:
hap 2021-03-24 21:49:24 +01:00
parent 0df3ef56fd
commit a3bee9faf7
1 changed files with 3 additions and 3 deletions
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6
src/devices/cpu/pps41/mm78laop.cpp
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@ -13,7 +13,7 @@ void mm78la_device::op_ioa()
{
// IOA: output A+carry to lower half of RO pins
u16 mask = (1 << (m_r_pins / 2)) - 1;
m_r_output = (m_r_output & ~mask) | (m_c << 4 | m_a);
m_r_output = (m_r_output & ~mask) | (m_c_in << 4 | m_a);
m_write_r(m_r_output);
}
@ -21,7 +21,7 @@ void mm78la_device::op_ox()
{
// OX: output A+carry to upper half of RO pins
u16 mask = (1 << (m_r_pins / 2)) - 1;
m_r_output = (m_r_output & mask) | (m_c << 4 | m_a) << (m_r_pins / 2);
m_r_output = (m_r_output & mask) | (m_c_in << 4 | m_a) << (m_r_pins / 2);
m_write_r(m_r_output);
}
@ -30,7 +30,7 @@ void mm78la_device::op_ix()
// IX: output A+carry to RO pins through PLA (MM78LA)
u32 out = ~m_opla->read(m_a) & 0x0fff'ffff;
out = bitswap<28>(out, 26,22,18,14,10,6,2,1,5,9,13,17,21,25, 27,23,19,15,11,7,3,0,4,8,12,16,20,24);
m_r_output = out >> (m_c ? 0 : 14) & 0x3fff;
m_r_output = out >> (m_c_in ? 0 : 14) & 0x3fff;
m_write_r(m_r_output);
}