Re: Apple//c newbie questions

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

Galen Tatsuo Komatsu <gkomatsu@Hawaii.Edu> wrote:

> In article <8OCT199805534625@vax2.concordia.ca>,
> Mitchell Spector <spec@vax2.concordia.ca> wrote:
> >    You should also know built-in devices are mapped to virtual
> >slots, such as the mouse mapped to "slot 4" (moved to "slot 7" on
> >the ROM 3, 4 and IIc+) the internal floppy mapped to "slot 6" and
> >a UniDisk 3.5 mapped to "Slot 5".
> 
>       Out of curiosity, where does the third 5.25 get mapped?

Mitch said "UniDisk 3.5", which is a different beast.

You can only have two 5.25" drives on a IIc, since it has a single disk
controller (and thus two drive select signals).  One of them is built
into the machine, so you can connect one externally.

The UniDisk 3.5 uses the SmartPort protocol, which has a completely
different selection mechanism (an intelligent serial protocol).

In theory, you could connect 127 UniDisk 3.5 drives to the IIc, as well
as one external 5.25" drive (at the end of the chain).

In practice, the power supply and signal loading are major restrictions,
and the firmware probably has a smaller artificial limit.  The limit
would be about four drives in total.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand