Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!burl!codas!akgua!akguc!rbk
From: rbk@akguc.UUCP (rbk)
Newsgroups: net.micro.atari16
Subject: Re: Patches for the RAM disk program
Message-ID: <7719@akguc.UUCP>
Date: Tue, 4-Nov-86 07:56:58 EST
Article-I.D.: akguc.7719
Posted: Tue Nov  4 07:56:58 1986
Date-Received: Wed, 5-Nov-86 06:34:58 EST
References: <1354@batcomputer.TN.CORNELL.EDU>
Organization: AT&T Technologies/Bell Labs, Atlanta
Lines: 39

<><><><><><><><>
> If you want to use the RAM disk program I've posted as a drive other
> than 'D', you have to patch it.  This patch is essential if you want to use
> a hard disk together with the RAM disk.  Here is an old hint:
>  ... (some lines deleted) ...
> What I think was meant:  Change the bytes at the following
> offsets from the beginning of the ".prg" file:
> 
> 	  offset	old value(for drive D)	new value (for drive F)
> 	  ======	======================	=======================
> 
> 	$145 (325)		03			05
> 	$173 (371)		03			05
> 	$181 (385)		03			05
> 	$193 (403)		03			05
> 
> The first one is the "BSET #3,D0" in the installation, the other three
> are "CMP #3,x(A7)"s in handling calls to disk device drivers.
> 
> For drive C instead of F, use the value 02.
> 
> To change the default RAM disk size, change the byte at offset
> $B3 (179): The value is the size in units of 64K, e.g. 03 for
> a default size of 192K, 09 for 576K.
> 
> WARNING:  These are untested speculations!!!
> If somebody tests this (with a hard disk, if possible), please tell us!
> Jeff, if you're out there: please confirm &/or post the fix and the
> disassembly!
> 
> - Moshe Braner

The patch works as advertised; thanks Moshe!

BTW, I changed the byte to "0C" for Drive "M" since
I already have a hard disk partition called "F".

	R. Brad Kummer	{ihnp4, seismo!akgua}!akguc!rbk
	AT&T Bell Labs	Atlanta, GA