Re: Disk II Controller problems

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

In article <1994Jun14.084701.1@orion.alaska.edu>,
Malone <astdm@orion.alaska.edu> wrote:
> 
> I am interested in info about a disk ][ working with a gs.  I have
> one but I am not sure if its suppose to be in a specific slot or
> what.  At first I thought the speed was off then I tried to adjust
> it.  I think it is spinning to slow.  

If you are using a Disk ][ controller card in a IIgs, you have to be
careful which slot it goes in.  Slots 4, 5, 6 and 7 are OK (assuming
you don't need the built-in device corresponding to the slot).

If you put the card in slots 1, 2 or 3, it will not work unless the
IIgs speed is set to "Normal".

The problem is that 5.25" disk access is extremely timing critical,
and disk I/O fails if the IIgs is running in "fast" mode.  There is
hardware support for slowing the computer down to "normal" speed while
a Disk ][ motor is on, but it only supports slots 4 to 7.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand