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Replacing Bipolar PROMs
Back in the 1970s and 1980s, digital electronics made quite a lot of use of Bipolar PROM chips. They are a memory device, which can be programmed just once, holding only a few hundred or a few thousand...
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Super Pacman repair log
I’ve just got an old Super Pacman arcade game running. Not the whole cabinet, you understand, which would be inconveniently large, but the circuit board from inside one, connected up to a monitor and...
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Espial Arcade Game Pinout
Getting through my collection of not-quite-working arcade PCBs, I’ve just sorted out ‘Espial‘ and made a JAMMA adapter for it. In the process, I discovered something missing from the available pinouts...
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Motorboating in Space
Or, how to stop Zaxxon going thump-thump-thump. ‘Motorboating’ has been a problem in electronics almost as long as electronics has existed. It gets its name from a characteristic thumping or buzzing...
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That syncing feeling: classic arcade games that won’t stay still
I’ve got a collection of classic arcade games from the ‘golden era’ of the early 1980s. They’re not the whole wooden cabinets with flickering lights and cigarette burns, but just the circuit boards...
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Super Breakout to JAMMA, Part 2: Colour
Having got the power supply working for my original 1978-vintage Atari Super Breakout PCB, it was time to get the screen looking right. At the time Super Breakout was made, video games were mostly...
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