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Add a divide-by-ten for the CIAs.

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This commit is contained in:
Thomas Harte 2021-07-23 19:25:53 -04:00
parent 956a6dbd64
commit 86c30769d9
1 changed files with 9 additions and 3 deletions
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12
Machines/Amiga/Amiga.cpp
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@ -70,9 +70,14 @@ class ConcreteMachine:
// Advance time.
// TODO: I think there's a divide-by-ten here. Probably these are driven off the 68000 E clock?
cia_a_.run_for(cycle.length);
cia_b_.run_for(cycle.length);
// The CIAs are on the E clock.
// TODO: so they probably should be behind VPA?
cia_divider_ += cycle.length;
const HalfCycles e_clocks = cia_divider_.divide(HalfCycles(20));
if(e_clocks > HalfCycles(0)) {
cia_a_.run_for(e_clocks);
cia_b_.run_for(e_clocks);
}
chipset_.run_for(cycle.length);
@ -293,6 +298,7 @@ class ConcreteMachine:
}
} cia_b_handler_;
HalfCycles cia_divider_;
MOS::MOS6526::MOS6526<CIAAHandler, MOS::MOS6526::Personality::P8250> cia_a_;
MOS::MOS6526::MOS6526<CIABHandler, MOS::MOS6526::Personality::P8250> cia_b_;