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Article #625082Re: DEC introduces PDP-6 [was Re: IBM introduces System/360]
From: Dan Espen
Date: Sat, 21 Jul 2018 12:27
Date: Sat, 21 Jul 2018 12:27
39 lines
3262 bytes
3262 bytes
David Wade <g4ugm@dave.invalid> writes: > On 21/07/2018 07:14, Quadibloc wrote: >> On Friday, July 20, 2018 at 2:47:17 PM UTC-6, Rich Alderson wrote: >>> Quadibloc <jsa...@ecn.ab.ca> writes: >>>> On Thursday, July 19, 2018 at 3:50:28 PM UTC-6, John Levine wrote: >> >>>>> Good point. Too bad that DEC sold 20 PDP-6's while IBM sold thousands of 360s. >> >>>> But look at all the PDP-8s that DEC shipped! >> >>> PDP-8 systems, of any stripe, are irrelevant to a discussion of mainframes! :-) >> >> I wonder. I mean, a PDP-8/I, suitably configured, could support eight time- >> sharing users, and you could add hardware floating-point to it. >> >> And a System/360 Model 30 had an 8-bit ALU... >> >> which would have given more performance? > > Well thats the difference between the PDP-8 and the System/360. Yes > DEC had PDP-8 and PDP-6 but incompatible software between the > two. System/360 was upward compatible from the Model 30 through to the > 195... > > ... as for more powerfull, the Model 30 was aimed at 1401 customers > who largely ran batch. Thye key was the 400 cpm reader and 600 lpm > punch. I don't think DEC offered such peripherals on the pdp-8, but > there again IBM didn't offer terminals on the 360-30. The IBM 2540 reader/punch read cards at 1000 CPM and punched at 300 CPM. Not that much faster than the 1401s 1402 that read at 800 CPM, punched at 250 CPM. I always considered punching cards to be a failure and resisted suggestions to do so. -- Dan Espen
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