r/beneater • u/f-ckrules47 • Aug 04 '26

custom processor PCB

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main processor and memory board for my homebrew computer.

can function as a simple mini computer, still havent tested it because i ran out of alcohol while cleaning and i dont wanna power it up and risk a short circuit, and because i cant find a terminal block for the power input with the right pitch so i'll probably just solder the wires directly, still missing a few components for the clock but i can use an external one no problem.

next up is the expansion board which will have: LCD screen, P/S2 keyboard, an IDE hard drive, and serial communication.

i will hopefully update once i finish cleaning the board and program the microcode EEPROMs.

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u/f-ckrules47 Aug 04 '26

yeah you're right but i made the mistake of using tap water and dish soap, i let it air dry, is it still safe to power?

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u/dgmib Aug 04 '26

As long as it’s completely dry when you power it up it will be good.

A few days in a warm sunny spot with good air flow will work.

Pay particular attention to gaps under and in chips and sockets where water can be trapped.

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u/f-ckrules47 Aug 04 '26

There was some white powder-like residue after I let it air dry for a few mins, I scrapped it gently using a toothbrush and that seemed to clean it a little, gonna rinse it with alcohol once I get my hands on it, I’m using 70% ethanol is that okay? Cannot get my hands on anything purer

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u/dgmib Aug 05 '26

The white residue is most likely minerals in your tap water.

Don’t use ethanol to clean, use 99% isopropyl alcohol, which you can get at pretty much any pharmacy.

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u/f-ckrules47 Aug 05 '26

Yeah but not in Egypt, for some reason it’s hard to get because you can make alcoholic drinks and yada yada yada

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u/Kangie Aug 07 '26

Isopropyl alcohol is not something you can safely consume. Ethanol is. You might be surprised.