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From: kskalb@faui1f.informatik.uni-erlangen.de (Klaus Kalb)
Newsgroups: comp.sys.handhelds
Subject: HP48: mcode question
Message-ID: <kskalb.664747707@faui1f>
Date: 24 Jan 91 20:08:27 GMT
Organization: University of Erlangen, Germany
Lines: 19

Hello,

Alonzo Gariepy says in his processor notes for the HP28 (at least in my copy)

--> It is said that R4 is used by the interrupt handler, but I have yet to
--> confirm it.

My question is:

--- Is it save to use R4 in mcode programs on the HP48 ?
    Or is that register indeed overwritten by the interrupt handler ?

Thanx,
-KK

PS:
I've posted a integer factorization routine (in mcode) just before xmas
and I never saw any responce to it. So I'm afraid most of you missed it
due to christmas holidays.  Is this true ? Should I repost it ?