Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!dlyons
From: dlyons@Apple.COM (David Lyons)
Newsgroups: comp.sys.apple
Subject: Re: ProDOS Mods...
Message-ID: <30737@apple.Apple.COM>
Date: 15 May 89 18:33:22 GMT
References: <8905150839.AA04530@crash.cts.com>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 22

In article <8905150839.AA04530@crash.cts.com> pnet01!pro-sat!pro-cyon!neilhncc1701d@nosc.mil writes:
>
>     Someone on here spoke about 'home mods' to ProDOS that allowed it to
>access volumes greater than 32megs... who was that? (Sorry). And how is this
>done?? And... well, you got my attention... tell me more!

It isn't possible to have volumes larger than 32 megs, or files larger than 16
megs, and still have the volume be a ProDOS volume.  These limitations are
inherent in the volume format itself, not just in the implementation of ProDOS.

The important things are:  2 bytes are used for block numbers (65536 blocks =
32 megs), and 3 bytes are used for file positions (3 bytes = 16 megs).


 --Dave Lyons, Apple Computer, Inc.          |   DAL Systems
   AppleLink--Apple Edition: DAVE.LYONS      |   P.O. Box 875
   AppleLink--Personal Edition: Dave Lyons   |   Cupertino, CA 95015-0875
   GEnie: D.LYONS2 or DAVE.LYONS         CompuServe: 72177,3233
   Internet/BITNET:  dlyons@apple.com    UUCP:  ...!ames!apple!dlyons

   My opinions are my own, not Apple's.