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Crazy Eddie's Used Computers

@fvzappa@mastodon.sdf.org
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Bit Mangler / Vintage Computer Liker

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17 Posts
Joined November 04, 2022
Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 2mo ago
Boosted by @GroupNebula563@mastodon.social
Found this really cool EduCalc Model 25 GD at a local recycler today. It's an HP-25 scientific/programmable calculator with a large Panaplex plasma panel grafted onto it. (There's also a handsome wood case involved.) The intended use was in the classroom; a teacher could use this calculator on a desk in front of a class of students, and the display would be visible to the class.
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Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 5mo ago

A photo from another universe (April, 1973). From left to right: Larry Clark, Chuck Thacker, Alan Kay, Ed McCreight, and the first operational Xerox Alto ("Bilbo"). Taken on the day the machine came to life.

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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 2mo ago
Replying to
That display is supposed to be an "X" and something has gone terribly wrong. Passes control logic diagnostics, should be fun to debug.
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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 5mo ago
And we have achieved Smalltalk-80.
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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 4mo ago

This Lab-8/e system belonged to a UW chemistry prof, he developed his own variant of Focal ("UW Focal") on this machine and used it to control various laboratory instruments. I'm hoping to get it all running this summer. Just working on getting it all installed in the rack right now, to free up some floor space in the garage!

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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 5mo ago

Made some good progress with the Xerox Dolphin this week. Got the console sorted out with new capacitors and a ton of cracked solder joints fixed up, and got the Shugart SA-4008 drive working again just by cleaning a few connectors -- it boots from disk into the Alto Executive. Backed up the drive over the network using Copydisk. Interlisp starts but hangs a few seconds after loading microcode.

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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 5mo ago

I finally found a workable yoke for my Xerox 1100 (Dolphin)'s console display and I am extremely excited to get a picture out of it (even if it's way too wide and off center... it'll take some tweaking to get it right). The Dolphin was the first system made by Xerox's System Development Department (SDD). SDD later made the Star workstation. Here's a couple of photos of it booting the Alto Net Executive off of the 3mbit Ethernet interface and running a small demo that displays Dave Boggs's face.

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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 4mo ago

Just acquired a very nice set of DEC documentation and man, there's some pretty stuff in there. I'm going to be busy with the scanner this summer...

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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 7mo ago
Replying to
The 11/70 is a fun system to work on. The service documentation is excellent and you get to work thorough fun diagrams like the one below, which traces through all execution paths of the microcode (all 256 words of it). 14 such sheets cover the entire microcode, which implements the entire PDP-11 instruction set as well as front panel operations. (With a lot of help from the hardware, of course.). Each box in that diagram describes what a single microcode word does when executed.
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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 6mo ago

Mark your calendars: The return of the Vintage Computer Festival: Pacific Northwest is only a month away! I will see you there or you will be square! https://vcfpnw.org/

vcfpnw.org

VCF PNW

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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 7mo ago

Over the holidays I started work on an emulator of the General Automation SPC-12 minicomputer (a computer I've become lightly obsessed with over the past few months). I transcribed a listing of "BUS-II" (Basic Utility System) from the manuals and I finally had time this week to work out the remaining kinks in the emulation. Behold, BUS-II in action for the first time in who knows how long:

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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 6mo ago
Replying to
@icm@mastodon.sdf.org Looking forward to commencing work on this thing, it's neat!
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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 5mo ago
Replying to
@kirtai@tech.lgbt Interlisp-D, Smalltalk-80, and Cedar were all options for this system and I'd like to try them all but Cedar's the one I'd really like to get running: https://www.youtube.com/watch?v=z_dt7NG38V4
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Open post
Crazy Eddie's Used Computers @fvzappa@mastodon.sdf.org
· 7mo ago
Replying to
@peterrenshaw@ioc.exchange @icm@mastodon.sdf.org It's an X200s that I got out of a free pile at a local event a few years ago. Nothing fancy but it's small and it has the extended battery, which still works great!
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