Yet another A3000 SCSI thread.

[huronking]

I swear I thought my main A3000 battery had already been replaced with a 2032 socket.

It wasn't, and it is screwed. It runs but the flickering video says it won't for long.

So I dig in the closet and swap out the motherboard with a ill-conceived 15-year old tower conversion project that has been gathering dust. It had the 2032, but it had long since died.

I pieced it together, and it will not recognize the SCSI drive. I ran SETBATT and it confirmed the power loss, but looks ok otherwise. The jumpers are identical, and both boards are missing the terminators. If that worked on one why not the other?

I put an A2091 in a slot and connected the same drive. It booted up fine.

I know SCSI is fickle, especially when it comes to termination, but why would a configuration work on one A3000 but not the other? What am I missing?

[huronking]

I did swap the WD chips although they are the same revision and it didn't change the behavior. As far as terminating the motherboard I'd have to order the terminators. I have three A3000's and none of them have them.

I assume that a DB25 terminator on the back would do, they are readily available online.

[huronking]

There is a diode that gets blown on a lot of A3000's when plugging/unplugging powered external devices. Test/replace it and see if that's it.

It tests exactly the same as the original motherboard including polarity.

It's crazy.

[huronking]

I ordered an external terminator... It misbehaves differently but still does not work. I guess it doesn't matter since the A2091 works just fine in it. Just seems a little bit of a waste.