Hi there!
> Take advantage of rom mirroring and use the last two ROM bytes for code
Well, that is only when you're not using the BRK vector.
And you can always just place two data bytes there.
> STA SWACNT ;Set PORTB to inputs
> STA SWBCNT ;Set PORTA to inputs
> ;Just with 4 default variables there is already a byte saving of 3 bytes!
Save another 6 bytes by removing those two STAs... ;-)
Greetings,
Manuel
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