Re: apple 11c

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

In article <dq06413@pro-palmtree.cts.com>,
James Poore <jpoore@pro-palmtree.cts.com> wrote:
> Usually the "unable to load prodos" on a known good disk means the drive is
> at fault and probably (but not always) a dirty head.

It could also indicate a fault in the track stepping.  If the
head was stuck on track zero, the boot block would load OK, and the
directory could be read, but the PRODOS file would not be loaded.

> There is also a defective chip in some of the IIc's but I don't know
> what versions of the IIc that have them. 

I haven't heard of any defective chips associated with the disk drive.
You might be thinking of the design "fault" (deliberate cost saving
measure) in the serial circuitry of the original IIc motherboard,
which generates baud rates that are about 3% too slow.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand