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This amazing gadget is a pen plotter, built from scrap parts. The plotting table is a direct-drive record turntable, salvaged from the dump. The pen is driven left and right by the carriage mechanism from a printer. The whole thing is driven from the laptop on the far right, via an Atmel ATmega32.
For the Ohio Scientific Inc. Challenger 1P microcomputer, 1978.
The audio from this cassette can be found here:
Assembled and running my PongClock.prc (which you can find here)
The program includes logic which disables the auto-off feature if it finds 2.75V or greater at startup.
This is my second PalmOS program, I wrote CountDown more than 10 years ago. Writing this one in 2010 wasn't easy, it may count as Retrocomputing. The tools I used back then were lost. I ended up using a Metrowerks CodeWarrier Lite I still had on CD. It won't even install on my new (Windows 7) laptop.
I've been getting some home-made ZX Spectrum programs off cassettes that have been various lofts for decades. Amazingly, most still load. See github.com/blogmywiki/ZXSpectrum for files you can load in emulators.
Dumping the contents from the varius RL02 diskpack present in the museum archive, using a MicroVAX II clustered with a simh system with VMS, the old PDP 11/34 of the museum, and the RL02 drive from the "new" PDP 11/23.
Freaknet Museum - museum.dyne.org
IBM PS/2 E, rear view of the unit with the available connector and the rear two pcmcia slot for expansion.
The brominated flame retardants used in plastics of older computers and gaming consoles eventually bond with oxygen, causing a yellow discoloration of the plastic that for years had no known resolution.
In March of 2008, a discovery by a German computer museum found that bonding the bromine with hydrogen could partially reverse the discoloration. Last night, I used that basic principle, with the help of some UV light and Oxiclean in addition to 3% hydrogen peroxide to restore an ADB mouse.
Here, I have one that has been treated sitting next to one that has not.