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Article #625081Re: DEC introduces PDP-6 [was Re: IBM introduces System/360]
From: David Wade
Date: Sat, 21 Jul 2018 09:11
Date: Sat, 21 Jul 2018 09:11
42 lines
3498 bytes
3498 bytes
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. I believe that the model 30 sold in the thousands, a number which I find staggering..... As for which was the way forward, well obviously the PDP-8 but if that is truly true why is IBM Z, which will still run problem state 360/30 programs, still sold, yet DEC and the PDP-8 are, whilst still "in use" in places, truely part of computing history, rather than computing present? > > John Savard > Dave
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