I'm trying to repair an Amiga 1000 with a Rev 6 motherboard, that developed a problem with the keyboard/character map. Now, I might be at fault here, I had a bare keyboard sitting on the desk, while trying to diagnose a bad keyboard switch, and might have shorted something. Suddenly, the machine switched to a different keymap, and now I'm getting strange characters such as the British Pound, Japanese Yen, the Copyright symbol, the US 'Cent' sign, etc. by default. It's as if the keyboard is sending an 'ALT-Down' by default, or more like the motherboard is seeing that and operating with an 'ALT-down' by default.
Now, I'm positive it's not the keyboard because I tried two different ones, and they worked the same way. I swapped the keyboard cable, swapped the CIA chips....no go. I've done a bit of research, and suspected that the RN5 10pin SIP resistor pack sitting between the CIA chips and the external floppy connector might be at fault. But after removing it and measure resistance on all pins, it looks like it's not at fault - I'm reading 1KOhm across all 10 pins (well, ground and 9 pins). Could this be an issue with one of the TTLs? I don't have a scope to put the machine on, so I'm rather limited.
Does anyone have experience diagnosing these types of issues, or has any suggestion?
Thanks.
