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Made a quick attempt at basic C[A/B]2 interrupts.

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This commit is contained in:
Thomas Harte 2016-07-05 20:39:15 -04:00
parent c3b7d24293
commit 1bb109a23b
1 changed files with 11 additions and 2 deletions
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13
Components/6522/6522.hpp
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@ -112,7 +112,7 @@ template <class T> class MOS6522 {
_registers.auxiliary_control = value;
break;
case 0xc:
printf("Peripheral control %02x\n", value);
// printf("Peripheral control %02x\n", value);
_registers.peripheral_control = value;
switch(value & 0x0e)
{
@ -207,7 +207,16 @@ template <class T> class MOS6522 {
break;
case Line::Two:
// TODO
// TODO: independence (?)
if( value != _control_inputs[port].line_two && // i.e. value has changed ...
!(_registers.peripheral_control & (port ? 0x80 : 0x08)) && // ... and line is input ...
value == !!(_registers.peripheral_control & (port ? 0x40 : 0x04)) // ... and it's either high or low, as required
)
{
_registers.interrupt_flags |= port ? InterruptFlag::CB2ActiveEdge : InterruptFlag::CA2ActiveEdge;
reevaluate_interrupts();
}
_control_inputs[port].line_two = value;
break;
}
}