Re: Slot 3 and a Z80 card

[Steven Hirsch <snhirsch@gmail.com>]

On 08/29/2010 07:18 AM, ict@ccess wrote:
> KP wrote:
> > Can you put a Z80 card (AE Z80+) in Slot 3 of a IIe, even if you have
> > an 80-column card in the Aux slot?
> >
> > Can you put a Z80 card (AE Z80+) in Slot 3 of a ROM 01 IIgs, or would
> > that disable the built-in 80-column firmware and mean that 80-column
> > text would not be possible on the IIgs?
>
>
> The results are in and the answer is:
>
> Yes and No  :)
>
> Yes you can put a Z80+ card in slot 3 of a IIe or a IIGS.
>
> No the card will not work with 80 columns.  On the IIGS you have to
> change the control panel to "Your Card" for the Z80 card to be
> recognized which switches out the 80 column firmware.
> On a IIe, the Auxiliary card has to be removed for the Slot card to be
> recognized thus losing the 80 column capability.
>
> But the card does work in slot 3 of both machines but only with 40
> column capability.

Unless I'm serious mis-remembering things, I believe that an Applicard will 
work fine in slot 3 of a //e.

And, here's part of a past conversation on csa2 relative to using a softcard 
style CP/M card in slot 3:

----------------------------- cut here -------------------------------

Subject:
Re: Softcard: DEVSEL instead of IOSEL possible?
From:
mdj <mdj.mdj@gmail.com>
Date:
Sun, 23 Nov 2008 16:21:41 -0800 (PST)
Newsgroups:
comp.sys.apple2

On Nov 23, 12:07 pm, Linards Ticmanis <ticma...@gmx.de> wrote:
> > Has anybody ever tried making the CP/M Softcard use DEVSEL $C0nX instead
> > of IOSEL $CnXX for CPU switching, by rerouting that trace? If I
> > understand things correctly, this should enable using the card in slot 3
> > (the only one free in my crammed IIe) with a patched CP/M. As the
> > Softcard doesn't really need ROM space I think this would be easily
> > possible.
> >
> > Of course the "slot scanning" code used to find the card would have to
> > go away (rather than merely be modified), as randomly accessing DEVSEL
> > space is probably a very bad idea. But the slot 3 location could simply
> > be hard-coded into the patched CP/M.
> >
> > Or am I completely on the wrong track here?

It should work fine. As you point out you'll need to defeat the detect
code and patch the select code accordingly, but I see no reason why it
won't work.

I usually just pull my mouse card when I need a z80 board, since I've
never had call for interrupts in z80 mode. A good alternative though
in your case might be to use one of James Littlejohns slot switchers ?

Matt

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