Sold Damaged A3000/16 motherboard

[CodePoet]

• A3000/16 rev6.3 motherboard
• Rev6.1 daughter card.
• 2MB of chip mem.
• 4MB (?) of 80ns zip RAM
• ROM tower, didn't pull it to check kickstart version.
• Small signs of battery damage, varta battery removed.
• Chip revisions clearly showed in photos.

Somebody hacked at this (not me). Probably an aborted attempt at upgrading to 25MHz? No idea if recoverable. It's beyond my ability.



$400USD, plus shipping, payment via PayPal fnf.

Bonus: $50 refund if you get this operational, and walk folks along the journey, ala linuxjedi or chucky or chris edwards. No bonus if you just scavenge it for parts.

Note: Chassis pictured is not included.

 

[apolkosnik]

Declaring interest.

 

[apolkosnik]

Pm sent

 

[PacificState]

Declaring interest.

 

[apolkosnik]

Funds sent

 

[CodePoet]

funds received, tracking number provided, marking as sold

 

[apolkosnik]

Long story short... I've replaced the CPU, fixed the ROM tower, and one of the CIAs was bad.
Pictures below.

Some kapton tape to protect the nearby capacitor

I missed the picture where I had loads of flux around the CPU :-(

This wick works the best for me

Replaced CPU, it will be ready for 25MHz upgrade.

4 pins on the left were easy to straighten out, but the one on the right needed to be cut, and I soldered a pin from an old 060 CPU socket.

After swapping around the CIAs, the machine booted into diagrom, but the bottom 512k of chipram was failing. Once, I replaced the bad CIA chip, everything worked ok

Mission complete! (mandatory Frontier screenshot)

Upgrading to 25MHz another day...

 

[CodePoet]

Thanks @apolkosnik for documenting your journey and reviving the board. PM me for the $50 refund as discussed. Great to see it revived and not just parted out..

 

[apolkosnik]

It was definitely repairable, so another one saved.

 

[apolkosnik]

I just changed the crystal from 32MHz to 50MHz and couple of jumpers on the motherboard. I guess the next step will be to remove 68881 and install a socket for 68882.

 

[CodePoet]

Still same 68030? Seems risky

 

[apolkosnik]

No, I removed the 16 MHz rated 030, and it was replaced with one rated for 33MHz, so that's ok. Maybe tomorrow I will get around socketing the FPU.

 

[CodePoet]

Why socket, just solder something down?

 

[apolkosnik]

I forgot to mention that also an INT2 fix was made to the board