The processor is the Dallas/Maxim ds89c420 mCU. It has five interupts, and after I saw this value the other day (5Bh) I did a search for it in the datasheet and came up with a list of vectors for the 5 interupts, so while I was able to verify this value is related to INT5, I still have to figure out what to do with it :-)

erik malund wrote:
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I'm befuddled, what processor are we talking about ?
Interupt vector is adress where your program will jump after interupt has been trigered.
For 5'th interupt it is 5Bh. So you should write something like that:

ORG 5Bh
' do what you want in interupt
RETI

I know of no processor with a vector at 5bh

Jeff, as to the size of your ISR (interrupt Service Routine) read my post in your previous question re this.

Have fun,

Erik