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Slightly simplified ready line release logic.

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This commit is contained in:
Thomas Harte 2017-02-23 21:08:32 -05:00
parent 82f392fada
commit 77ed4ddc05
1 changed files with 5 additions and 10 deletions
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15
Machines/Atari2600/Atari2600.cpp
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@ -63,9 +63,6 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
cycles_since_speaker_update_ += cycles_run_for;
cycles_since_video_update_ += cycles_run_for;
if(!tia_->get_cycles_until_horizontal_blank(cycles_since_video_update_))
set_ready_line(false);
if(operation != CPU6502::BusOperation::Ready) {
// check for a paging access
@ -134,14 +131,11 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
} else {
const uint16_t decodedAddress = address & 0x3f;
switch(decodedAddress) {
case 0x00: update_video(); tia_->set_sync(*value & 0x02); break;
case 0x01: update_video(); tia_->set_blank(*value & 0x02); break;
case 0x00: update_video(); tia_->set_sync(*value & 0x02); break;
case 0x01: update_video(); tia_->set_blank(*value & 0x02); break;
case 0x02:
if(tia_->get_cycles_until_horizontal_blank(cycles_since_video_update_))
set_ready_line(true);
break;
case 0x03: update_video(); tia_->reset_horizontal_counter(); break;
case 0x02: set_ready_line(true); break;
case 0x03: update_video(); tia_->reset_horizontal_counter(); break;
// TODO: audio will now be out of synchronisation — fix
case 0x04:
@ -204,6 +198,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
}
}
if(!tia_->get_cycles_until_horizontal_blank(cycles_since_video_update_)) set_ready_line(false);
mos6532_.run_for_cycles(cycles_run_for / 3);
return cycles_run_for / 3;