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

["Bill Garber" <willy46pa@comcast.net>]

"Paul Schlyter" <pausch@saaf.se> wrote in message
news:bkfqoi$s9q$1@merope.saaf.se...
> 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.

Come to think of that. I do need switch 4 set to ON to run it
with my 80 column card in place. Sorry that I didn't remember
that part.

> 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.

I do this with every single card I get, and also be sure that the
pins are straight and clean. You can use a small piece of very fine
emery paper rubbed lightly over them to clean the pins.

Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy46pa@comcast.net



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