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Article #621037Re: Why so many 6s and 8s in the 70s?
From: hanc...
Date: Fri, 16 Mar 2018 17:45
Date: Fri, 16 Mar 2018 17:45
28 lines
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2550 bytes
On Wednesday, March 7, 2018 at 9:19:17 PM UTC-5, John Levine wrote: > In article <p7ptui$sgd$2...@reader1.panix.com>, > Walter Bushell <pr...@panix.com> wrote: > >And the 709 a precusser of the 709X. Preceeding this was the IBM 700. > > 701 and 704, actually. > > The 701 was IBM's first real computer in 1952. The much improved 704 followed it > in 1954, and the 709 in 1957. > > The 702 and 705 were character addressed commercial machines, same era > but quite different architectures. > > I don't know why they all started with 7. IBM's calculator series were in the 600s, so I would guess that 7 was the next available series. IBM planned to have the subsequent computers in the 800 or 8000 series, but this was cancelled and replaced by S/360. I don't know where the "14" came from for the 1401 series. As an aside, I believe IBM's most popular calculator was the 604 which used vacuum tubes. But IBM also had the transistorized 608 and 609. They only sold a few models and I suspect more done as an experimental platform for transistor logic as opposed to a real product.
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