Thanks for the pics. I have replaced those caps. I'm sure it was a good idea anyway, but it didn't solve the ROM problem.

I've proven the logic board works OK by swapping in ROM chips from a Plus - it boots fine.

Now just waiting for blank EPROMs to arrive so I can copy the Plus ROMs for this board.

Then I suppose I should replace the electro caps on my Plus board - though it is working fine so far.

Rick