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Corrects potential ColecoVision SGM AY timing issues.

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This commit is contained in:
Thomas Harte 2018-03-07 16:16:58 -05:00
parent 2dade8d353
commit 9abc020818
1 changed files with 3 additions and 0 deletions
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3
Machines/ColecoVision/ColecoVision.cpp
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@ -252,6 +252,7 @@ class ConcreteMachine:
default: *cycle.value = 0xff; break;
case 0x52:
// Read AY data.
update_audio();
ay_.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BC2 | GI::AY38910::BC1));
*cycle.value = ay_.get_data_output();
ay_.set_control_lines(GI::AY38910::ControlLines(0));
@ -289,12 +290,14 @@ class ConcreteMachine:
break;
case 0x50:
// Set AY address.
update_audio();
ay_.set_control_lines(GI::AY38910::BC1);
ay_.set_data_input(*cycle.value);
ay_.set_control_lines(GI::AY38910::ControlLines(0));
break;
case 0x51:
// Set AY data.
update_audio();
ay_.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BC2 | GI::AY38910::BDIR));
ay_.set_data_input(*cycle.value);
ay_.set_control_lines(GI::AY38910::ControlLines(0));