3.1 ROM problem - strange 3.0 ROM wiring

[Doobrey]

Castellen wrote:
If this modification has been like this from new, then at a guess it's to correct a problem if those data lines in the ROM had been accidentally swapped during a prototype manufacturing run from the ROM manufacturer??

Is the '9311' the datestamp of the ROMs? ie week 11 of 1993
I just looked at amiga-hardware.com's   A1200 Rev1D3 piccy and it's ROMs are labelled '9307' ..and no reworking on them either.
 I guess the '1043' and '1044' refer to the data that Macronix programmed them with, and these are the same too.

It'd be interesting to find out what rev motherboard these are installed on.

[Doobrey]

Safalra wrote:
 I'm not too keen on the idea of performing surgery on the ROMs.

You could always get 2 pairs of 40 pin sockets and perform the hack on them (ie treat the second pair as if they were the ROMs).
That way you can test the 3.1 ROMs without damaging them.