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Enables an assumption of partial address decoding at the ACIA and PSG.

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This commit is contained in:
Thomas Harte 2020-01-04 17:27:55 -05:00
parent 42a9585321
commit 3ab4fb8c79
1 changed files with 2 additions and 2 deletions
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4
Machines/Atari/ST/AtariST.cpp
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@ -292,7 +292,7 @@ class ConcreteMachine:
cycle.set_value8_high(ay_.get_data_output()); cycle.set_value8_high(ay_.get_data_output());
ay_.set_control_lines(GI::AY38910::ControlLines(0)); ay_.set_control_lines(GI::AY38910::ControlLines(0));
} else { } else {
if((address >> 1) == 0x7fc400) { if(!(address&2)) {
ay_.set_control_lines(GI::AY38910::BC1); ay_.set_control_lines(GI::AY38910::BC1);
} else { } else {
ay_.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BC2 | GI::AY38910::BDIR)); ay_.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BC2 | GI::AY38910::BDIR));
@ -349,7 +349,7 @@ class ConcreteMachine:
mc68000_.set_is_peripheral_address(!cycle.data_select_active()); mc68000_.set_is_peripheral_address(!cycle.data_select_active());
if(!cycle.data_select_active()) return delay; if(!cycle.data_select_active()) return delay;
const auto acia_ = ((address >> 1) < 0x7ffe02) ? &keyboard_acia_ : &midi_acia_; const auto acia_ = (address & 4) ? &midi_acia_ : &keyboard_acia_;
if(cycle.operation & Microcycle::Read) { if(cycle.operation & Microcycle::Read) {
cycle.set_value8_high((*acia_)->read(int(address >> 1))); cycle.set_value8_high((*acia_)->read(int(address >> 1)));
} else { } else {