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From: blgardne@esunix.UUCP (Blaine Gardner)
Newsgroups: comp.sys.amiga
Subject: Boot-block checksum?
Message-ID: <538@esunix.UUCP>
Date: Sun, 25-Oct-87 22:14:19 EST
Article-I.D.: esunix.538
Posted: Sun Oct 25 22:14:19 1987
Date-Received: Thu, 29-Oct-87 06:48:17 EST
Distribution: na
Organization: Evans & Sutherland Computer Corporation
Lines: 15
Keywords: help

A friend is trying to install a DeciGel and/or NoFastMem type patch in
the boot-block (to persuade EA and Psygnosis games to work), and has run
into problems calculating the checksum for the boot-block.

> I need the _exact_ procedure for calculating the boot block checksum
> (after the four character identifier). Assembly source would be
> _ideal_. Also, any info about where I can find more disk _structure_ 
> information (block checksums, VTOC, etc.) would be helpful.

Can anyone give him a hand?
-- 
Blaine Gardner @ Evans & Sutherland    540 Arapeen Drive, SLC, Utah 84108
UUCP Address:   {ihnp4,ucbvax,decvax,allegra}!decwrl!esunix!blgardne
		{ihnp4,seismo}!utah-cs!esunix!blgardne
"I don't see no points on your ears boy, but you sound like a Vulcan!"