Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/5/84; site steinmetz.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!whuxl!whuxlm!akgua!mcnc!ncsu!uvacs!edison!steinmetz!davidsen
From: davidsen@steinmetz.UUCP
Newsgroups: net.micro
Subject: Re: NEC V20 -- seems to work
Message-ID: <358@steinmetz.UUCP>
Date: Thu, 9-Jan-86 09:30:42 EST
Article-I.D.: steinmet.358
Posted: Thu Jan  9 09:30:42 1986
Date-Received: Sat, 11-Jan-86 07:29:18 EST
References: <756@spar.UUCP>
Reply-To: davidsen@kbsvax.UUCP (Davidsen)
Organization: GE CRD, Schenectady, NY
Lines: 26
Summary: 


I have two V20's which I got just to try them out. In an XT there is no really
visible change in performance (measurable, but not really much, 15%). On my
S100 system running 8MHz no wait state (static memory), interpreted BASIC
seems to run a good bit faster. I had to change some software timing loops.

I compiled some C programs using the 80186 option, and that *does* make a
diference! I think the big change is "push immediate", which eases the
register allocation, as well as being a bit faster. I have not yet gotten the
CP/M emulator program, since I have a baby blue card to use.

The real bonus is if you get down into assembler and use the extra
instructions. I have been thinking about a postprocessor for assembler source
out of C, which would identify some operations and use special instructions
instead. This would still leave me with portable source code, just another
compile step for the V20 machines.
-- 
	-bill davidsen

	seismo!rochester!steinmetz!--\
       /                               \
ihnp4!              unirot ------------->--- crdos1!davidsen
       \                               /
        chinet! ---------------------/

"It seemed like a good idea at the time..."