A4000 not working with A3640

[Abou27]

Hello all,

I am having problems with an A3640(rev 3.1) board that I bought for my A4000/030 (Buster 11 and 3.1ROMS).  I have changed jumper J100 on the MB from INT to EXT and the J100 on the processor card is set to enable MAPROM.  When I power up I just get a light grey screen.  Also, both the HD and floppy access lights come on and stay on permanently.  I am unable to get the start-up screen on reset or power-up.  I have tried switching back to the original processor card and everything works fine.  Do I have a dodgy A3640 or is there any other explanation?  I have looked at Warren Block's site but can't seem to find all the jumpers he mentions (eg. J488) :-?

Any help from one in the know would be much appreciated!

Cheers :-)

[Abou27]

I don't have any cards added to it at the moment.  Presumably, this would only affect Zorro II cards added or as it is a DMA problem, can unexpanded systems suffer?

Cheers.