Re: ZipGS Recommended Slot Speeds

[dempson@actrix.gen.nz (David Empson)]

Michael J. Mahon <mjmahon@aol.com> wrote:

> Bryan Parkoff wrote:
> >>>Slot 1: SuperDrive Controller Card, set FAST
> >>>Slot 2: Nothing/set to Modem Port, set SLOW
> >>>Slot 3: Uthernet, set FAST
> >>>Slot 4: ZipGS, set FAST
> >>>Slot 5: Nothing/Set to Smartport, set FAST
> >>>Slot 6: Nothing/Set to the 5.25" drives, set SLOW
> >>>Slot 7: CFFA, set to FAST
> >>
> >>You should be able to set slot 2 to fast.  Everything else looks OK.
> > 
> > 
> >     I recommend to move ZipGS card into slot 3 instead of slot 4.  Make sure
> > to set built-in 80-column in slot 3 instead of "Your Card".
> >     Uthenet card looks like ethernet card for network.  It can be put in
> > slot 4.  Set slot 4 to "Your Card".
> >     ZipGS controller card does not have contact to the slot 3 because it is
> > grounded or cut-off.  No current flow between ZipGS controller card and slot
> > 3 because it is not necessary.  It needs to sit in slot 3 so it is the way
> > how slot 3 holds ZipGS controller card without falling down.  The current
> > flow between ZipGS controller card and CPU socket help to speed up faster.
> >     You can always use 80 column while ZipGS controller card is set to fast.
> 
> Actually, the ZipGS uses the slot for power, but does not use any
> bus signals, so there is no need to set the slot to "Your Card".

I thought the ZipGS used signals related to DMA in the slot connector,
but I haven't had a close look to confirm it.

This may have been a misunderstanding on my part. I'm aware that the
8-bit accelerators (e.g. ZipChip) don't work with DMA, but the IIgs ones
do. I assumed this was partly due to better design, but also because
they were paying attention to the DMA request signal and accessing any
other necessary signals from the slot bus.

-- 
David Empson
dempson@actrix.gen.nz