Re: Can you boot something else than "PRODOS" in ProDOS?

["Bill Garber" <willy46pa@comcast.net>]

"Linards Ticmanis" <ticmanis@gmx.de> wrote in
message
news:451c5970$0$5154$9b4e6d93@newsspool1.arcor-onl
ine.net...
> Hello,
>
> is it possible to get the ProDOS 5.25 inch boot
sector to boot a file
> that isn't called "ProDOS"?
>
> The Infocom V6 cames call their reduced DOS
"INFODOS", but I had no luck
> preparing a new bootable 5.25 inch image with
that, except if I renamed
> it to "PRODOS". Just patching the string
"INFODOS" in the place where
> "PRODOS" is in the boot block doesn't work, even
though "PRODOS" is
> followed by a bunch of space characters (0x20
Hex) in the image.
>
> I guess that the length of the file name to find
is also stored
> somewhere in the boot block. I'm sure I could
find out if I tried hard
> enough, but maybe somebody else has already
solved the problem before?


Just ahead of the filename is a Hex number, which
in the case
of PRODOS is $26, 2 means the file type and 6
being the length.
So for INFODOS, simply change that number to $27,
and you're good
to go.

Hope this helps.

Bill Garber
Owner - Garberstreet Enterprizez
http://garberstreet.netfirms.com/
Co-owner - GSE-Reactive
http://www.GSE-Reactive.com