Re: Tweaking DOS.SYSTEM from Extra-K to support other DOS 3.3 variants

["RedskullDC" <RDC@oz.org>]

Hi Moll,

> I've gotten this far:
>
> 1. A program I wrote a few years ago to convert images of the running DOS 
> to files and vice-versa.  It creates a file which needs only to have a 
> 256-byte header, the first 256 bytes of DOS.SYSTEM, attached to it.
>
> 2. Found the format of DOS.SYSTEM and replaced the DOS image with ZDOS 2.3 
> (DOS 3.3 variant).  File launches correctly with one exception: it 
> immediately exits to BASIC after initialization, it does not attempt to 
> RUN HELLO.

Did the DOS images that you used come from diskettes which had 'HELLO'
as the startup program? Was the startup program on those DOS'es an
APPLESOFT file?

If not, it is possible your versions of DOS.SYSTEM are looking for
a different startup program and/or a different file-type.

Beagle Bros Utility City (first one that comes to mind) allowed changing
the file-type of the startup program to an exec file for example.

Do you have any code/disk image downloadable somewhere that we may
have a looksie?

Cheers, and good luck with it.
Red