Re: IRQ for 6502

From: Christer Palm (
Date: 2001-08-21 18:59:37

Spiro Trikaliotis wrote:
> I believe to remember that the 65xx software (or hardware?) handbook (or how
> it is called) by MOS Technologies (that is shipped with the KIM1, for
> example) mentions this, as it mentions the exact timing of the interrupt (or
> RESET) procedure. Unfortunately, my copy of this book is far away, so I
> cannot check it...

I assume you mean the "MOS Microcomputers Hardware Manual"?

Just checked it, and all it says is that an "interrupt will be
recognized after the processor completes the instruction which it is
currently executing". There are some timing diagrams, but reading the
accompanying text reveals that the delays showed there are merely

Christer Palm

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