16 bits would make it some model of the PDP-11 If you read CHAPTER 4 INSTRUCTION SET of the PDP-11 processor handbook at <http://bitsavers.org/pdf/dec/pdp11/handbooks/PDP-11_Processor_Handbook_1981.pdf#page=53>, it should be clear why DEC used octal notation.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Gibney, Dave [000003b5261cfd78-dmarc-requ...@listserv.ua.edu] Sent: Saturday, August 19, 2023 1:12 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: vi Pretty sure it was 16 bits. The assembler I was learning used octal notation. The next semester class was 370 assembler using the Struble book. In many ways, I owe my entire career too that class. > -----Original Message----- > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf > Of Paul Gilmartin > Sent: Friday, August 18, 2023 2:00 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: vi > > [EXTERNAL EMAIL] > > On Fri, 18 Aug 2023 20:37:35 +0000, Seymour J Metz wrote: > > >> The early 1970s PDP-10 (and PDP-8) were the Digital Equipment forerunners > of the later DECSYSTEM and VAX computers. > > > >No; the PDP-6 and PDP-10 were 36-bit machines. The PDP-5 and PDP-8 were 12 > bit machines unrelated to the DECSYSTEM-10 and -20 and the VAX-11. The > forerunner of the VAX was the 16-bit PDP-11. > > > <https://secure-web.cisco.com/1BAZUrQGiZ88pKVQFnpJpe8kzSpJyU3D6Pur1B0q4aGqGW9dOtYwSRPYAO34vwzuC5wsMEvEA7NuiNLeiGRGUQMftLQfyAyHjwKwoCFNl_vQ_IjFe3Qp4UTJdGfrtlEZUSCcyM6ugySGpMQVfjfs0KeEN3etEJ-x3RG2CeNAM1lRGczpsWkx2c2Khh7Sy3NpglPfgkm087iIIhVjguz6fdvsZzaMjFhUl1YMvtzvp82SQQNBkjixxH4iFi6iCxxB_WYKDGzHqfxV34vx2hliFiPREpycHKTSbgRF4AwMv30DzzwF7qDpWByfvuiA8WA37mcvkDhOGhtS0YeP6DqWMoePOrYWZaq-YXoMO-IEBMPu5dCli7efNgu2yMYl0OVDSgv9urRqlJ-InNd8rthOUm3cSV1rg8YfwMsietO70BhU/https%3A%2F%2Fnam12.safelinks.protection.outlook.com%2F%3Furl%3Dhttps%253A%252F%252Furldefen > se.com%2Fv3%2F__https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FProgrammed_ > Data_Processor__%3B!!JmPEgBY0HMszNaDT!vHVtpLbj7su56m0olLJcdNrJAkUZRi > 5YoOE6zpPKiI6MZ05n8vnGCe8_rdYeQAkdTZ_6QziItBQuvYvBZUs- > ksLI7BIn7f8t%24&data=05%7C01%7CGIBNEY%40WSU.EDU%7C43d886a21d2d4 > e21a8b208dba02e0cb8%7Cb52be471f7f147b4a8790c799bb53db5%7C0%7C0%7 > C638279891870712574%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD > AiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&s > data=I0%2Fs09Uk10VARlTvajwZO308WP9D1jVhRyT%2BegLbrrM%3D&reserved= > 0 > > > -- > gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
