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| Cray-1 internals - technology briefs from 1984 http://anycpu.org/forum/viewtopic.php?f=3&t=925 |
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| Author: | BigEd [ Thu Jun 16, 2022 6:10 am ] |
| Post subject: | Cray-1 internals - technology briefs from 1984 |
. Derek Foulk is uploading a series of 1984 VHS training videos to YouTube, addressed at engineers or technicians, describing the Cray 1 series implementation, from logic gates up. All the voltages are negative... and the pullup resistors, one per logic gate, are pulling up to -2V. There's also a bit about twisted pair signalling between logic boards, where one of the pairs is terminated at a pullup, which I can't say I understand at all. (Almost) all the chips are the same 16 pin dual-NOR with 1ns propagation delay. With an external pull-up, and with wired-AND capability, and with both true and false outputs. Here's part 1, first 10 mins https://www.youtube.com/watch?v=-4IFopGT20Y next 10 mins, which concludes unit 1 (The 5/4 Gate) and starts unit 2 (The Master Clock) https://www.youtube.com/watch?v=WAMSI4dUFqM next 10 mins continues unit 2 https://www.youtube.com/watch?v=jNqLdsqO5_c and that's all, so far. I'll update this post and bump the thread when I notice that more have turned up! Unit 3 is the Module Clock, unit 4 is the Latch, and unit 5 covers Documentation. |
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| Author: | alrj [ Thu Jun 16, 2022 5:04 pm ] |
| Post subject: | Re: Cray-1 internals - technology briefs from 1984 |
Thank you, this is very interesting ! |
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