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From: wilker@gauss.math.purdue.edu (Clarence Wilkerson)
Newsgroups: comp.lang.pascal
Subject: Re: UCSD P-system
Summary: p-code machine for 8080 z80
Message-ID: <11090@mentor.cc.purdue.edu>
Date: 28 May 90 18:55:10 GMT
References: <33@usblues.UUCP> <9110017@hpfcso.HP.COM> <1990May27.034028.27700@m2xenix.psg.com>
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About a year before Turbo Pascal hit the CP/M market, I did a
complete dis-assembly of the p-code machine as distributed by
Heath-Zenith for the H89 with hard sectored drives. The object
was to produce a system that would run with hard drives and
the newer soft sectored drives. The hardware interface was rather
tangled in with the interpreter in this version.
  I ended up with a working standalone system for the newer
hardware, and also a version that attached itself to a CP/M
BIOS and was thus fairly portable to other CP/M machines.
   Randy Hyde's book was invaluable in doing the dis-assembly.