acorn atom and acorn system series • Re: How do you use ROM expansion boards?

That done, I would try poking 0-7 to any address in the utility ROM memory space

Thanks for the suggest it worked but not quite in the way I expected. Each socket is selected by writing 1 to a complete byte.

So
?#a000=1 selects IC1
?#a001=1 selects IC2
?#a002=1 selects IC3
?#a003=1 selects IC4
and so on. Bit wierd but seems to work.

That BBC OS ROM won’t work. The ROM should be addressed at #Fxxx and you’ll need a BBC BASIC ROM from #8000-#BFFF. To achieve this you need to swap a few address lines. And that is exactly what the BBC BASIC board does. So you can remove it.

Thanks for the recommendation - I'll see if I can find a BBC Basic adapter board at some point.

Statistics: Posted by sfalvey — Sun Jun 23, 2024 7:41 am

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