Re: Apple IIc Booting from external drive

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

In article <1uojop$k33@donald.ee.pdx.edu> kevins@donald.ee.pdx.edu (Kevin Stanton) writes:
> It says ''cannot read disk'' when trying to boot up.
> I tried pr#6,2 but it still spun up drive A.
>
> Is there a way to bypass this?

Possibly.

First, find out which version of IIc you have by typing PRINT PEEK(64447).

If it says 255, you have the original IIc ROM.  Other possible values
are 0, 3 and 4.

The original IIc ROM lets you boot ProDOS from an external 5.25" drive
by typing PR#7.  You can't boot DOS 3.3 or Pascal using this method.

All subsequent versions of the IIc (which add UniDisk support) have
this feature removed.  If my copy of the IIc hardware reference manual
is to be believed, you can boot from the first external drive by typing
PR#5.  I suspect this only applies to a UniDisk 3.5, and not a 5.25"
drive.

Why do you want to boot from the external drive?  Is your internal one
faulty or something?
-- 
David Empson                                                               
dempson@swell.actrix.gen.nz                                                
Snail mail: P.O. Box 27-103, Wellington, New Zealand