Overhauling an IC Programmer

[NeXT] needed an EPROM programmer to work with chips from vintage computers. Starting with a low cost programmer, he built this custom IC programmer to handle all of his programming needs. The device is based on the Willem 5.0e programmer. [NeXT] was not satisfied with the device, noting that it had to...

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Acoustic Delay Line Memory

Back in the olden days  when computers were both analog and digital, making RAM was actually very hard. Without transistors, the only purely electronic means of building a memory system was vacuum tubes; It could have been done, but for any appreciable amount of RAM means an insane amount of tubes, power,...

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[Fran]‘s LEDs, Nixies, and VFDs.

With a love of blinky and glowey things, [Fran] has collected a lot of electronic display devices over the years. Now she’s doing a few teardowns and tutorials on some of her (and our) favorite parts: LEDs and VFD and Nixie tubes Perhaps it’s unsurprising that someone with hardware from a Saturn V flight...

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