matsondawson / vic20dart Goto Github PK
View Code? Open in Web Editor NEWDart based Vic20 emulator
Dart based Vic20 emulator
I was trying to make the one single function cycle()
for 6560 and 6561 and found that the only difference is this _scanLineCounterDelay
found in 6560.
If I've understood well it's used to update the scanline counter with delay, but I wonder why it's not the same for 6561. I imagine they are the same chips differing only in register values, is that so?
if (_scanLineCounterDelay-- == 0) {
if (_scanLine==260) {
registers[4] = 0;
registers[3] &= 0x7F;
} else {
registers[4] = (_scanLine + 1) >> 1;
registers[3] = (registers[3] & 0x7F) | (((_scanLine + 1) & 1) << 7);
}
}
If opened in FireFox, the startup screen is totally blue.
By giving POKE 36879,0
the screen turns blue with black border and black text.
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