If you still have a copy of A22-6501, please send a scan to bitsavers. I could give you a cite for the 7090, but that's a few years later.
I believe that there are machines with both logical and unsigned opcodes. I know of no trademark issues, just local tradition. Is it a branch, a jump or a transfer? Is it an index register, a B-line, a B register or an X register? Is it an exception, a fault, an interrupt or a trap? -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List [ASSEMBLER-LIST@LISTSERV.UGA.EDU] on behalf of Paul Gilmartin [00000014e0e4a59b-dmarc-requ...@listserv.uga.edu] Sent: Tuesday, June 13, 2023 12:17 PM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: Shower thought On 6/13/23 09:42:56, Seymour J Metz wrote: > In both cases they are treated numerically as a whole, For logical > instructions the operands are treated as unsigned numbers. The distinvtion > goes back to the vacuum tube ("valve" for you Brits) machine, well before > S/360. Citation needed. <https://www.explainxkcd.com/wiki/index.php/285:_Wikipedian_Protester> But it's jargon, exempt from requirement for explanation. I would have chosen "Unsigned" but others might argue that would refer to the magnitude, ignoring the sign bit. Etc. And there may have been trademark entanglements with opcode mnemonics. -- gil
