On Fri, 30 Mar 2018 16:11:30 -0400, Steve Smith wrote: >Believe what you like, but not everyone has eidetic memory over a 40-year >span. Besides, Amdahl's placement of the slash was illogical, and was >often misplaced even then.
Shmuel is correct. Dr. Amdahl was not a believer in virtual memory, and when he started Amdahl Corporation in 1970, it wasn't required for any of the major operating systems from IBM. So the original 470 design did not include virtual memory, and the the model number of the first machine was to be 470/6. "470" signified that it was the fourth generation machine for the 1970's. With the addition of virtual memory to the 370 series and the introduction of OS/VS1, OS/VS2, and DOS/VS, the 470 design was enhanced to include virtual memory on all models, and the 470 series became the 470V series. The "V" went with "470" not with the model number. The placement of the slash was perfectly logical if you understood the reason for it. The models in the 470V series were the 470V/5, 470V/6, 470V/7, and 470V/8. -- Tom Marchant >On Fri, Mar 30, 2018 at 12:35 PM, Seymour J Metz <[email protected]> wrote: > >> I might believe 470V/6. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
