From: Ethan Dicks (ethan.dicks_at_gmail.com)
Date: 2007-09-21 09:37:03
Hi, All,
I'm trying to finish debugging an old project, and I could really use
a detailed map of zero-page usage for both BASIC 2 and BASIC 4 ROMs.
I don't care at all about BASIC usage, but I care deeply about PRINT
and PRINT # (and any attendant screen scrolling and IEEE I/O). With
what I've found out there, I probably have a 99.5%-accurate
understanding of zero-page usage, but I think I've reused one, or
perhaps two, locations that I thought were safe, but in practice,
appear not to be.
Years and years ago (1978?), I used to have a printed listing in
several columns (one per ROM revision) of each address and what uses
it. It was handed to me on xeroxed typewritten pages, not xeroxed
from a book, and might have been handed around from user-group to
user-group. I would recognize it from its contents, but I have not
had a copy myself in at least 20 years. I keep hoping a scan or OCR
of it might turn up on funet/zimmers.net, but I've never seen it.
If anyone can point me to any documents, it would help me put a
decades-old-project to bed (and share with the world).
Thanks for any tips,
-ethan
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