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Questions tagged [printed-circuit-board]

All about PCBs: repairing, making replicas, troubleshooting, drawing & original documentation, etc.

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5 votes
1 answer
520 views

Reverse engineering an old 40-pin connector

I found a 40 pin connector on the side of one of my old electric typewriters. There is zero documentation of this plug online or in the owner's manual, and I want to figure out what exactly it can do. ...
UberRix's user avatar
  • 51
16 votes
4 answers
3k views

Did anybody use PCBs as macro-scale mask-ROMS?

Early on, even fairly small ROM's were quite useful. For example, you could fit a minimal upper-case only font for a terminal into something like 256 bytes. And that's a scale that a human could lay ...
wrosecrans's user avatar
  • 2,264
4 votes
0 answers
169 views

IDE interface board design review [closed]

Hope this is ok here. This seems to be the place with the real hardware experts. As some of you may recall, I've been trying to get a 44 pin IDE SSD module working on a retro IDE interface. The SSD ...
eesz34's user avatar
  • 571
31 votes
2 answers
4k views

What is the Commodore 64C "France version" and why does it need a beefy resistor?

While perusing the schematics for the Commodore 64C (titled COMMODORE-64 B/NE) I came across a suspicious section of the power supply: The unregulated "9V" is connected to the completely ...
pipe's user avatar
  • 1,713
9 votes
1 answer
1k views

What was the first computer board to be wave-soldered?

The Wikipedia article on wave soldering does not give any information on its history. What was the first computer circuit board to use this process? I am specifically looking for computers that were ...
DrSheldon's user avatar
  • 16k
3 votes
2 answers
548 views

How did wave soldering work? [closed]

While it is not used as much nowadays, wave soldering was a big advance in the productivity of manufacturing electronics, compared to soldering all the components by hand. It consists of placing all ...
rwallace's user avatar
  • 61.3k
1 vote
1 answer
186 views

Need help with lifted pads/traces on a TRS-80 Model 100 PCB

The worst imaginable thing you can think of happened. I've tried making a minor repair and it all rolled downhill like a snowball and now I have significant damage. Extent of Damage The pads got ...
The T's user avatar
  • 561