A3000 repair

[Castellen]

Yes, use the standard ROM for those tests because we know the behaviour of it.  I've got no idea exactly what DiagROM does on startup.  Pretty sure it'd have to clear the Overlay line in the same way, this moves the ROM from address $00000000 to $00F80000 so that the system can use the memory from $00000000.

[Pat the Cat]

One of the things that complicates the A3000 is the built in SCSI controller.

The settings for this are stored in NVRAM, but removing the battery also removes the settings. How you get them back in and saved properly is one issue.

Some A3000s require at least one SCSI device connected even to fire up and boot from floppy. That might be the core issue.

http://bboah.com/index.php?action=artikel&cat=7&id=1854&artlang=en

They certainly can play possum, that can mean they're just lonesome for a drive to talk to.

[James1095]

Well the battery is gone because it leaked on the board and made a mess which I believe I've cleaned up. Hard to say if there's more damage lurking when I can't get it to do much at all. I never get anything on the screen, only thing that happens is the power LED goes from dim to brighter, IIRC with the Kickstart ROMS there is a brief burst of activity on the bus immediately after reset and then it halts. Still haven't had a chance to mess with it more but will do further tests soon.

[don27dog]

Would definitely try terminating the scsi. My 3000t had similar symptoms until I put a terminator on the end of the scsi chain.

[James1095]

Would definitely try terminating the scsi. My 3000t had similar symptoms until I put a terminator on the end of the scsi chain.

I did have a terminator on there initially when I was messing with it, haven't tried terminating with the diag ROM. I'll reinstall it for further testing.