I purchased my GA-5AA second-hand, so I don't have the original PS/2 bracket, and I'm struggling to figure out the pinout, as the manual is useless in this regard, and I don't have a scope to figure it out with. If anyone knows the pinout, or has an original bracket for this board they can post pictures of, I'd greatly appreciate it.
Do you have a good Digital Voltmeter ? Since it is a 4 pin connector One is Ground, One is +5. Once you figure those out it becomes easy: the two left are Data and Clock which would connect to the other two signal wires (some ps2 adapters have 6 wires but 2 are NC). If it does not work one way it should work swapped. Using any PS2 bracket and the proper 4 wires you should be able to get it to work.
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun
I only have an old analog multimeter, which works fine for most things, but I was reading 5v on more than one pin, probably the clock and +5v. I don't have a spare ps/2 mouse floating around at the moment, so I didn't want to find out if throwing +5v on the clock or data pin would kill the thing.
I lucked out and found an eBay auction that included the bracket, and there were pretty good pics of the connector, so I figured out the pinout.
Zoom in on the first picture here: http://retro-pc.ucoz.ru/index/gigabyte_ga_5aa/0-989
1. red
2. black
3. white?
4. yellow?
The manual for other gigabyte AT boards has the pinout listed, which matches up, see page 3-3: https://mbmanuals.retropc.se/manuals/47/586atv4.pdf
Here's another close-up of a different revision, but you can work out what's what because the connector is keyed:
Thermalwrong wrote on 2020-09-11, 20:20:The manual for other gigabyte AT boards has the pinout listed, which matches up, see page 3-3: https://mbmanuals.retropc.se/manuals/47/586atv4.pdf
Here's another close-up of a different revision, but you can work out what's what because the connector is keyed:
Oh, thanks for that! Didn't know about other Gigabyte AT boards having the same pinout, but I should have guessed. That pinout matches what I worked out from the pics I found. The pic you posted matches the board revision I have (v1.1), but the 2.2 and 3.2 boards are exactly the same, the connector is just turned 90 degrees.
