Re: Slot 3 and a Z80 card

[KP <kjpmail@gmail.com>]

On Aug 29, 9:25 am, Steven Hirsch <snhir...@gmail.com> wrote:
> 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....@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
>
> -------------------------------------------------------------------------------

How do those slot switchers work?