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From: stern@bnl.UUCP (Eric G. Stern)
Newsgroups: comp.unix.questions,rec.games.chess
Subject: Re: The Game of Chess - Summary
Message-ID: <96@bnl.UUCP>
Date: Tue, 28-Apr-87 13:14:19 EDT
Article-I.D.: bnl.96
Posted: Tue Apr 28 13:14:19 1987
Date-Received: Sat, 2-May-87 04:08:14 EDT
References: <183@tness1.UUCP> <1748@lsuc.UUCP>
Organization: Physics, SUNY StonyBrook
Lines: 42
Xref: mnetor comp.unix.questions:2081 rec.games.chess:164

> In article <183@tness1.UUCP> mechjgh@tness1.UUCP (8753) writes:
> >  from  ihnp4!sun!gorodish!guy (Guy Harris)
> >
> >Most likely, the reason why they didn't port it is that there are
> >large chunks of PDP-11 assembly-language code in it, and nobody felt
> >like rewriting it. 
> >
> >> Does anyone have the source code to chess ?
> >
> >Grab a PDP-11 V7, S3, or maybe S5 tape, and start from there.  Make
> >sure you have a PDP-11 instruction set description handy, and maybe a
> >VAX one if you decide to rewrite the stuff in VAX assembler....
> 
> Fascinating. We're running Edition VII Workbench (basically v7
> with a few bits of BSD thrown in) on a Perkin-Elmer 3220, with source.
> The source to chess is here -- I just tried compiling it, and it
> compiles fine.  A bunch of the routines are indeed written in assembler.
> 
> 
> There's no indication as to where the P-E chess sources come from.
> ...
> I'd be interested in further light anyone can shed on this;
> I'm curious as to what was involved in rewriting or translating the
> assembler.
> 
> David Sherman
> The Law Society of Upper Canada
> Toronto
> -- 
> { seismo!mnetor  cbosgd!utgpu  watmath  decvax!utcsri  ihnp4!utzoo } !lsuc!dave

A few years back, I had a go at rewriting the PDP-11 assembler parts of
chess in C.  The result was that it mostly worked, but there was some
subtle problem in move ranking.  Also under BSD 4.2 (but not on VAX/VMS or
PDP-11 V7) there is a problem with the display.  If anyone is interested
in taking this over, let me know.

				Eric G. Stern
				Dept of Physics, SUNY
				stern@bnl.arpa
				stern@bnl.bitnet
				...!philabs!sbcs!bnl!stern