At 19:33 21/02/2011 +0000, you wrote:
Only in the JM and previous rom versions. From JS onwards I believe it
works as it's supposed to.
Certainly Minerva and MG tested each 16k ROM slot when I made my 256k EPROM
expansion card
Incidently I mapped the floppy drive code in that slot freom 64k upwards.
I jave done many odd things in the hardware field that folk may be
interested in. But when two people here asked for pics I find myself
dismayed at their responses. One came back instantly with "Oh no it isnt".,
the other to four emails gave no substantive reply save one to explain why
it doesn't work. They both come across as experts and I was just an
shamateur bodger.
I did tread , I think, a an unusual trail through computing and have for
some time have been thinking of writing it up with illustrations (crippling
limitation of this board.)
Not to forget the backplanes.
My own solution was not planar, more like a crooked spine., in effect a 2
or 3 way expansion.
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