ROM cross-locator idea (was: Re: Tester(s) needed for PET Zork)

From: Larry Anderson (
Date: 1998-12-18 05:27:00

Ethan Dicks wrote:
> The KERNEL stubs I have written only support jumps into the 4.0 ROMs.  I
> haven't had the time to support older ROMs, yet.  I do want to, because the
> ultimate goal of this project is to prove a high-school friend wrong when he
> said that his Apple ][ was better than my PET because , "your PET will never
> play Zork."  My first PET was a 32K model 2001 w/graphic keyboard.  I still
> have it.

I had this really cool idea a month ago, but with most of them, nary the time...

Make datafiles of all the various ROM contents, then with a cross-locator
program; plug in an entry point and what ROM it is from and then make the
locator match the code (by scanning up say 5 to 30 'command' bytes and finding
suitable matches on the other 'ROMs') thus find the alternate ROMs' entry
points.  I've converted programs with this very method manually but I don't
have the space to have two different model PETs side-by-side running Supermon
to do the searches...

Comon now, this shoud be a cinch, any takers?
This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail

Archive generated by hypermail 2.1.1.