Drive Keeps Running...

[Tony Cianfaglione <ab616@chebucto.ns.ca>]

   I have a IIc which boots fine, displays all pixels (no missing dots),
runs full 80 columns, will do a cat on ProDOS and a CATALOG on DOS 3.3,
will load and run Apple II Desktop, will load and run all of my 8 bit
games and programs and generally works well.

   The disk drive just won't stop running.  I have to use a Control-Reset
to stop it at each interval when I want to remove a disk.  It will allow
me to enter any commands I want at any time but the drive keeps on running
(much like the Energizer Bunny).

   Plugging an external drive in the back causes the external drive to
keep running while the built-in drive stops so it is obviously passing the
problem along out the Smartport to the external drive.  Everything else
runs and works fine.

   It is a 255 ROM [using print peek (64447)] but it also has the color
box (OA + CA) diagnostic screen that runs forever and never says anything
like System OK.

Any ideas?

Thanks...