Re: Dos CP/M on a Z80 card require an 80 column card to work?

[pausch@saaf.se (Paul Schlyter)]

In article <3F6A183E.96DE8797@yahoo.co.uk>,
Dave Dragon  <davedragonuk@yahoo.co.uk> wrote:
 
> I have managed to get a Z80 card (which appears to be a clone of the
> microsoft card) running in my Apple II+. I think its running! I
> downloaded a CPM disk image from http://www.cpm.z80.de/binary.html and
> the disk boots on the Apple and if the Z80 card is out it gives a "no
> Z80 found" error, with the card in it gives no error, but nothing else
> either.
> Does anyone out there know if CP/M expects an 80 column card to work?
 
Apple CP/M uses an 80-column card if it finds it in slot 3, but it
doesn't require it -- it'll work in 40-column mode.
 
Some CP/M _applications_ might refuse to work in 40-column mode
(for instance Wordstar requires a minimum of 64 columns) though.
But Apple CP/M itself will run in 40 columns.
 
The dip switches on the Z80 card may have been set improperly -- all
4 of them should be set to the OFF position to run Apple CP/M.
 
If this doesn't solve the problem, something is probably bad with the
card.  One thing you could try is to remove and re-insert all the
chips a couple of times, in case there's a bad connection due to
oxidation somewhere.
 
-- 
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