I don't know about the original PDP-6 software, but the macro assembler for the PDP-10 required brackets around an instruction literal.
That was one of the machines that I would have been happy to program in my youth. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> on behalf of Paul Gilmartin <00000014e0e4a59b-dmarc-requ...@listserv.uga.edu> Sent: Wednesday, August 20, 2025 12:34 PM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU <ASSEMBLER-LIST@LISTSERV.UGA.EDU> Subject: Re: Execute-Type Instructions External Message: Use Caution On 8/20/25 08:50, Seymour J Metz wrote: > DEC and GE (later HoneyBull) supported instruction literals; I don't recall > whether SDS or UNIVAC did. Which machine were you on? > -- PDP6-10. A literal was: < instructions and/or data ... > -- gil
