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It sounds like the two sync signals are exclusive ORd.

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This commit is contained in:
Thomas Harte 2015-08-19 21:36:33 -04:00
parent 3c3c4d2f7c
commit 043d2f9896
1 changed files with 20 additions and 21 deletions
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41
Machines/Atari2600.cpp
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@ -199,31 +199,30 @@ void Machine::output_pixels(unsigned int count)
}
}
// logic: if in vsync, output that; otherwise if in vblank then output that;
// otherwise output a pixel
if(_vSyncEnabled) {
state = (_horizontalTimer < start_of_sync) ? OutputState::Sync : OutputState::Blank;
} else {
// blank is decoded as 68 counts; sync and colour burst as 16 counts
// blank is decoded as 68 counts; sync and colour burst as 16 counts
// 4 blank
// 4 sync
// 9 'blank'; colour burst after 4
// 40 pixels
// 4 blank
// 4 sync
// 9 'blank'; colour burst after 4
// 40 pixels
// it'll be about 43 cycles from start of hsync to start of visible frame, so...
// guesses, until I can find information: 26 cycles blank, 16 sync, 40 blank, 160 pixels
if (_horizontalTimer < (_vBlankExtend ? 152 : 160)) {
if(_vBlankEnabled) {
state = OutputState::Blank;
} else {
state = OutputState::Pixel;
}
// it'll be about 43 cycles from start of hsync to start of visible frame, so...
// guesses, until I can find information: 26 cycles blank, 16 sync, 40 blank, 160 pixels
if (_horizontalTimer < (_vBlankExtend ? 152 : 160)) {
if(_vBlankEnabled) {
state = OutputState::Blank;
} else {
state = OutputState::Pixel;
}
else if (_horizontalTimer < end_of_sync) state = OutputState::Blank;
else if (_horizontalTimer < start_of_sync) state = OutputState::Sync;
else state = OutputState::Blank;
}
else if (_horizontalTimer < end_of_sync) state = OutputState::Blank;
else if (_horizontalTimer < start_of_sync) state = OutputState::Sync;
else state = OutputState::Blank;
// logic: if vsync is enabled, output the opposite of the automatic hsync output
if(_vSyncEnabled) {
state = (state = OutputState::Sync) ? OutputState::Blank : OutputState::Sync;
}
_lastOutputStateDuration++;