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From: roy@phri.UUCP (Roy Smith)
Newsgroups: net.wanted
Subject: Re: Experience building an Assembly Emulator?
Message-ID: <164@phri.UUCP>
Date: Tue, 29-Jan-85 12:15:22 EST
Article-I.D.: phri.164
Posted: Tue Jan 29 12:15:22 1985
Date-Received: Thu, 31-Jan-85 01:11:29 EST
References: <77@gitpyr.UUCP>
Distribution: net
Organization: Public Health Research Inst. (NY, NY)
Lines: 17

> I'm in the process of designing and building and emulator for IBM PC
> Assembler. It seems the only really tricky things should be handling
> interrupts.
> Phil Hutto {akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!gitpyr!pwh

I once wrote (as a class project) an emulator for a mythical (fairly
simple) machine architecture.  The hardest part was setting the overflow
flag.  C doesn't support any way (that I know of) to detect carry/overflow.
I ended up writing litle host-assembler (this was on a pdp-11) routines
to do the arithmetic operations and return the result and also set the
condition codes.  Fortunately, the mythical machine did 2s-complement
arithmetic.
-- 

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