Re: IIgs Floppy for the IIc ?

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

Wayne Stewart <waynes@intergate.ca> wrote:

> Marcus wrote:
> 
> > is it possible to use a 3,5" floppy-drive from a IIgs on a IIc ?
> > I connect the 3,5" drive to the IIc but when I want to use the disk only the
> > LED lights, but nothing happen.
> 
> No. the IIgs 3.5" drive(A9M0106) won't work at all with a IIc. There is a
> drive called the 3.5" UniDisk(A2M2053) that will work with the IIc. Only
> catch is that if you have one of the earliest IIcs, then you need a ROM
> upgrade to use it. To tell if you need this upgrade from the basic prompt type
>  "PRINT PEEK (64447)" and press return.
> If it displays 255 then you have the earliest IIc and can't use the 3.5"
> UniDisk
> without a ROM upgrade.
> If it displays 0 you can use the 3.5" UniDisk
> If it displays 3 or 4 you also have a memory expansion connector.

Two points I feel I should add:

- A displayed value of 3 or 4 means that the machine has the firmware
version which supports the memory expansion connector, but this doesn't
guarantee that the connector is there.  It is possible to install either
of these firmware versions in an older logic board, which would not have
the memory expansion connector.  This is an unusual situation, so it is
most likely that you do have the connector.

- If you have an Apple IIc+, PRINT PEEK(64447) will display a 5.  The
Apple IIc+ _does_ support the A9M0106 (Apple 3.5 Drive).  The IIc+ has
the equivalent of one of these drives built in, and will support one
externally.