Article View: comp.arch
Article #1782Re: DECsystem-20 (sort of...)
From: Kok Chen
Date: Tue, 08 Aug 1989 22:30
Date: Tue, 08 Aug 1989 22:30
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mrc@Tomobiki-Cho.CAC.Washington.EDU (Mark Crispin) writes:
>As I remember, the F-1 (only one of which was ever built) was at III (is
>this right?) and was used to calculate the vector graphics used in TRON.
>On a PDP-10, TRON (Test Right half of register with immediate, set masked
>bits to Ones, and skip if any masked bits were Non-zero) is opcode 666!
^^^^^^^^^^
But, Mark, thats in OCTAL!!!
:-) :-) :-) :-) :-) :-) :-) :-)
Seriously, <MRC>'s mentioning all those PDP-10 instructions reminds me
why I hated writing a compiler for that machine!
There WAS one feature of the '10 that I loved though, and that is the
ADJBP instruction that allows byte pointers of any size (from 1 bit to 36 bits)
to be manipulated. (char *)a - (char *)b was a true pain, though :-)
---
Kok Chen {decwrl,sun}!apple!kchen
Apple Computer, Inc.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!att!pacbell!ames!claris!apple!kchen From: kchen@Apple.COM (Kok Chen) Newsgroups: comp.arch Subject: Re: DECsystem-20 (sort of...) Message-ID: <33837@apple.Apple.COM> Date: 8 Aug 89 22:30:42 GMT References: <2679@phred.UUCP> <24933@tau.mips.COM> <3151@blake.acs.washington.edu> Organization: Apple Computer Inc., Cupertino, CA Lines: 23