Re: IIgs ROM 01 & Z80+

["Charlie" <charlieDOTd@verEYEzon.net>]

"KP" <kjpmail@gmail.com> wrote in message 
2ef69942-dca8-4872-806b-f6cc25bbb252@l6g2000yqb.googlegroups.com">news:2ef69942-dca8-4872-806b-f6cc25bbb252@l6g2000yqb.googlegroups.com...
On Oct 4, 2:27 pm, "Charlie" <charlieD...@verEYEzon.net> wrote:
> "KP" <kjpm...@gmail.com> wrote in message
>
> fab247ae-34ce-4494-a030-532022e128e7@l20g2000yqm.googlegroups.com">news:fab247ae-34ce-4494-a030-532022e128e7@l20g2000yqm.googlegroups.com...
>
>
>
> >I have a Z80+ card in Slot 4 of my IIgs ROM 01.
>
> > When I use it solely as "Your Card," it works.
>
> > I then switch to "Mouse Port" for a GS/OS application, reset, 
> > run
> > the
> > application, and the mouse works fine.
>
> > I then switch to "Your Card," reset, boot a CP/AM disk (either
> > 5.1.1
> > or 4), and CP/AM doesn't properly function.
>
> > Turning off the IIgs and then turning it back on does not fix 
> > the
> > problem; the Z80+ and/or CP/AM continue to malfunction.
>
> > Opening the IIgs, re-seating the card, and re-booting the 
> > machine
> > set
> > to "Your Card," and I get another successful use of the
> > Z80+/CP/AM.
> > But as soon as I temporarily switch it to Mouse and then back
> > again, I
> > get the same problem.
>
> > Does this sound like anything familiar to anyone on here? I am
> > going
> > out of my mind trying to figure out what I need to do to
> > permanently
> > fix this.
>
> I don't know how this would have anything to do with your problem,
> but I do think you should be careful when you put cards that were
> meant for earlier Apples in an Apple IIgs. If the older card uses
> the /INH line and does not mask the addresses when the line can go
> low it can cause bus contention (see Apple IIGS Tech Note #32).
> Supposedly, if that happens it can damage the Mega II chip. I have
> no idea if your Z80 card uses the /INH line but I wouldn't want to
> take the chance until I found out for sure. By the way, the Carte
> Blanche card with the included bitstream has z80 code that uses 
> the
> /INH line. I don't know enough about the z80 functionality to say
> if it is masked or not.
>
> Charlie
>--------------
Where can I get a carte blanche card from?
>--------------

http://www.applelogic.org/CarteBlanche.html

But there were only about 50 made so far and I think they were all 
sold about a year ago.  You could contact them to find out if they 
are going to make more.  There was talk that they were going to make 
more with a larger FPGA.
Keep in mind that the Carte Blanche card was made for the Apple //e. 
I'm running mine on my IIgs right now but I'm not using the z80 part 
for several reasons.

Charlie