(🧵 1/6) Spent the day visiting with the parents, and so Dad and I took another crack at repairing my #Amiga #A500. This computer is _still_ kicking my ass, but we've gotten further than we did last time. - ThreadSky

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scottsmall.org • 18 days ago

(🧵 1/6) Spent the day visiting with the parents, and so Dad and I took another crack at repairing my #Amiga #A500.

This computer is _still_ kicking my ass, but we've gotten further than we did last time.

Comments

scottsmall.org•18 days ago

(🧵 2/6) We've finally identified the issue with the keyboard. The fault is in the connector between the PCB and the keyboard membrane. The /Y13, /Y9, and /Y8 signal lines will intermittently stop working, but wiggling the connector and putting pressure on it will make those lines work again.

scottsmall.org•18 days ago

(🧵 3/6) (Except for + on the numpad...bad switch?)

We tried cleaning the connector with Deoxit, but it didn't help. So I decided to replace the controller PCB entirely with a DoohicKEY - hopefully that's the end of the keyboard problems for good. I'll update again once it arrives and is installed.

scottsmall.org•18 days ago

(🧵 4/6) As for the serial port, we repaired a second broken trace, unfortunately it made no difference. We followed the schematic and confirmed pins 2/3/4/5/6/8/20 all have continuity to the correct pins at U38/U39 (and pin 22 to R502), and that there aren't any shorts, so, not sure what's wrong.

scottsmall.org•18 days ago

(🧵 5/6) Maybe a problem with the loopback adapter itself? That feels really unlikely though. Or a bad IC at U38/U39? Or a CIA problem (maybe we should try swapping the CIAs?)

I might put off the serial port problem until I actually need the serial port (and have another device to test it with).

scottsmall.org•18 days ago

(🧵 6/6) The internal floppy drive also still isn't working, but we didn't have time to look at it today.

Previously: https://bsky.app/profile/scottsmall.org/post/3lfjdacsnp22n

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