Re: Clone ROMs and ProDos patches

["Paul Grammens" <grammens@svn.net>]

"Ernest" <ernestls@attbi.NOSPAM.com> wrote in message
news:Rhat8.275131$q2.34676@sccrnsc01...
> Mike reminded me of something tonight that (slaps forehead) I had
forgotten,
> which is that ProDos won't run on clones that don't splash
> "APPLE ][" on the screen at start up, and it will halt on the ProDos
startup.
>
> So I'm wondering ProDos patches now. I have a MicroSCI Havac that need's a
> patch for ProDos, and I'm curious about how I might be able to do this.
Has
> anyone else had any luck creating a patch like this?
>

It's in the faq:

http://home.swbell.net/rubywand/Csa2DOSMM.html#039

an excerpt:

    " To fix the booting problem, do this:

 Start Copy II+ and select "Sector Editor"

 Swap-in the ProDOS diskette

 READ Track 0, Sector 0

 Search for (Hex bytes): 69 0B D0 03 A5 0C 60

 When you find the above, change the D0 03 to EA EA
 and write the changed sector back to diskette.

     The patch eliminates the checksum test/branch and allows ProDOS to boot
on Apple II clones which would normally fail the check. This patch has no
effect
on ProDOS functioning on regular Apple II's.


     The above patch is absolutely necessary to get a bootable ProDOS
working
for many Apple II clones. Jim Sather (inCider, March 1986) recommends a
second
patch which is optional. It prevents ProDOS from erroneously reporting that
a //e-style 64K 80-column card is present when running on a Franklin. "