Path: 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 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,'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.