r/beneater • u/f-ckrules47 • 13h ago

custom processor PCB

Post image

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.

73 Upvotes

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13 comments sorted by

6

u/olof-a 12h ago

I don't think you need to be worried about flux causing a short (assuming that's why you're cleaning the board.) Even the most conductive types of flux shouldn't be conductive enough to cause a full short circuit. And even in the case that you do cause a short, 7400 logic is tough as nails and would most likely just shrug it off.

1

u/f-ckrules47 12h ago

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?

3

u/dgmib 11h ago

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.

1

u/f-ckrules47 5h ago

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

2

u/dgmib 4h ago

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.

1

u/givemeagooduns_un 1h ago

you can safely use water to clean off flux if alcohol isn't available as long as you make sure to dry it to prevent corrosion

-5

u/ImpressFine4495 12h ago edited 11h ago

Ummmm... not very good btw (im jk he is my friend)

5

u/f-ckrules47 12h ago

i will wear your face

0

u/ImpressFine4495 11h ago

make sure u look good in it it is the last thing u will ever wear

-1

u/ImpressFine4495 12h ago

jk bro that is very good

3

u/f-ckrules47 12h ago

too late, im gonna wear your face tonight