Path: utzoo!utgpu!watmath!att!dptg!rutgers!cs.utexas.edu!ico!ism780c!news
From: news@ism780c.isc.com (News system)
Newsgroups: comp.arch
Subject: Re: DECsystem-20 (sort of...)
Message-ID: <31316@ism780c.isc.com>
Date: 9 Aug 89 19:04:45 GMT
References: <2679@phred.UUCP> <24933@tau.mips.COM> <3151@blake.acs.washington.edu>
Reply-To: marv@ism780.UUCP (Marvin Rubenstein)
Organization: Interactive Systems Corp., Santa Monica CA
Lines: 11

In article <3151@blake.acs.washington.edu> 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!

Sounds like an IBM 709 clone.  The corresponding 709 operation, RNT (Right
half indicators on test) was opcode 0056 (octal).  LNT was 4056, RFT (Right
half indicators off test) was 0054 and LFT was 4054.

    Marv Rubinstein