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by cs.BlueChip
Sun Jan 18, 2009 7:31 pm
Forum: Programming
Topic: instruction logic reference?
Replies: 19
Views: 12518


"oVerflow Flag (P.V)"
-Third use: Sticky input bit. Connected to the SO pin.


As an input or output?
Ie. does the pin effect the register or vice versa?


"What is an Interrupt?"
-Strictly speaking, it's the voltage itself that signals an IRQ, not a change in voltage. For NMI on the other hand ...
by cs.BlueChip
Wed Jan 07, 2009 12:08 pm
Forum: Programming
Topic: instruction logic reference?
Replies: 19
Views: 12518

Garth Wilson,

I am responsible for the Cyborg 6502 page.

It was written mainly to force me to memorise 6502 for hacking a "Doctor v64".

I have no great enthusiasm for updating it to document the NMOS chip, unless it can be done in a couple of hours.

BUT

You mention "inaccuracies" ...bad ...