Gregory's Server
new project release! this one is a floppy drive exerciser board, good for testing and aligning all sorts of floppy drives.
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The Minuteman III missile (1970) is America's land-based nuclear deterrent, with 400 missiles ready to launch. The missile used a complex guidance system with over 17,000 electronic and mechanical parts that cost $4.5 million in current dollars. Let's take a look at the guidance system and computer. 1/N
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@kenshirriff I know this sounds like a dumb question but how did they test that their ICBMs could hit their targets. You can't just fire a dummy ICBM at Russia for obvious reasons. @kenshirriff  @kenshirriff As always, your post is highly interesting. In particular those about embedded systems like this one broaden my understanding of what a computer is, was, and could be. Thanks a lot! it started on a panelized array with mouse bites so each board can be broken out separately.  another early morning electronics flea market here in silicon valley (West Valley College). we're so early the sellers haven't arrived yet. fixed an IBM 729 tape unit today. this is one of several electromagnetic clutches used to engage the forward and reverse directions on the left and right reels. in this case, the problem was that one of the carbon brushes used to transfer power from the stationary part to the rotating part had gotten worn all the way down. Someone wanted my reading list of nonfiction "interesting books" so here you go. 🧵 Bloom - Eccentric Orbits Kushner - Masters of Doom  @tubetime Oh, you should definitely read John Clark's "Ignition! An Informal History of Liquid Rocket Propellants".
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@tubetime I remember seeing a landline phone in a catalogue in the 90s being described, with what looked like a strategic line breaks, as: "carved from 
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are you in Silicon Valley? do you want to check out old computers this Friday or Saturday? come to the Vintage Computer Festival (Aug 2-3). it is being held at the Computer History Museum in Mountain View. your ticket also gives you access to the rest of the museum, so definitely check that out!
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 @tubetime i'm so confused about the AMR section, how can all three Vxyo be valid at the same time? edit: oh I guess the other two are reverse ones?   I bolted on WAV output to my pen plotter workflow to drive the oscilloscope. It’s all just X and Y all the way down.
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@tubetime Funny enough, they don't even mention the function of four pins in the Manual (E1, E2, E3, E4), so maybe they should have gone with a DIP6 instead? (yes, I know, much more common, e.g. for optoisolators) |
@tubetime
I've been seeking this. 🥁
@tubetime
That seems extremely handy!
I'm curious about you mentioning the 26 pin drives as being "HP". Those are just using the Sony OA-D30V or OA-D31V like you would find in a 9121 right?
@tubetime @philpem This looks cursed and I love it