does everyone realize that LEDs are diodes (e.g. only light up when correct polarity?
TTL can sink more than it can source, therefore reference to +5 rather than ground. (Many groups still connecting to common ground.)
invert in the calling program.
purpose of quiz (open book) is to measure what's known of lecture material, ability to absorb, apply, etc..
program1: $200 A5 40 = LDA $40 $202 85 41 = STA $41program2:
$200 AD 00 03 = LDA $0300 $203 8D 01 03 = STA $0301