Path: csiph.com!eternal-september.org!feeder.eternal-september.org!nntp.eternal-september.org!.POSTED!not-for-mail From: Lynn Wheeler Newsgroups: alt.folklore.computers Subject: Re: Self-hosting and the 6502 Date: Sat, 04 Apr 2026 12:31:34 -1000 Organization: Wheeler&Wheeler Lines: 34 Message-ID: <87ldf2we61.fsf@localhost> References: <10qehuo$2nu4m$1@dont-email.me> <10qekqr$279uk$1@dont-email.me> <10qf5de$2u8s$1@gal.iecc.com> <10qh8ar$3otrd$1@paganini.bofh.team> <875x67jv13.fsf@localhost> <10qq27k$depp$2@dont-email.me> <10qr7mq$omgk$1@dont-email.me> <10qs1rl$10uoq$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Date: Sat, 04 Apr 2026 22:31:37 +0000 (UTC) Injection-Info: dont-email.me; posting-host="76572fc4f83d6ddee43d93afcd459afe"; logging-data="1085359"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+qJBXcx/TiuQPyLzpN8oD9Q7VeHnIK6Pg=" User-Agent: Gnus/5.13 (Gnus v5.13) Cancel-Lock: sha1:tKIUHyi8eDmzhKcA42wwDPjvEHM= sha1:QC0DGGnxxeabexrak2JU3sXFn/M= Xref: csiph.com alt.folklore.computers:234613 Lawrence D’Oliveiro writes: > CMS didn’t do multiuser. Hence the need for the “VM” part. some of the MIT CTSS/7094 people went to 5th flr to do MULTICS, others went to IBM Cambridge Science Center on the 4th flr and did CP40&CP67 virtual machine (and single user monitor "CMS" specifically designed for running in virtual machine ... although originally it could run on 360 native hardware (early CMS development was on "bare" 360/40 before CP40 was operational) .... but that capability was removed in transition from CP67 to VM370). Originallly CSC wanted 360/50 to modify with virtual memory ... but all the spare 50s were going to FAA/ATC and so had to settle for 360/40 and did CP40/CMS ... when 360/67 standard with virtual memory came available, CP40 morphs into CP67. Note: virtual memory done for 360/40 modifications were somewhat different from virtual memory done from 360/67 ... more information available here: https://www.leeandmelindavarian.com/Melinda/JimMarch/CP40_The_Origin_of_VM370.pdf with decision to add virtual memory to all 370s, some of the CSC people, took over the IBM Boston Programming Center on the 3rd flr for the VM370 Development group. 3rd flr BPC before becoming VM370 development group, had earlier done CPS https://en.wikipedia.org/wiki/Conversational_Programming_System ... although a lot was subcontracted out to Allen-Babcock (including the CPS microcode assist for the 360/50) https://www.bitsavers.org/pdf/allen-babcock/cps/ https://www.bitsavers.org/pdf/allen-babcock/cps/CPS_Progress_Report_may66.pdf -- virtualization experience starting Jan1968, online at home since Mar1970