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From: hedges@calma.UUCP (Tom Hedges)
Newsgroups: net.micro.mac
Subject: Re: A 128K ROM and HFS Question
Message-ID: <150@calma.UUCP>
Date: Tue, 11-Feb-86 18:26:02 EST
Article-I.D.: calma.150
Posted: Tue Feb 11 18:26:02 1986
Date-Received: Thu, 13-Feb-86 17:13:34 EST
References: <346@infsc3.hatpoly.UUCP> <694@harvard.UUCP> <636@well.UUCP>
Reply-To: hedges@calma.UUCP (Tom Hedges)
Organization: GE/Calma Co., R&D Systems Engineering, Milpitas, CA
Lines: 32

In article <636@well.UUCP> espen@well.UUCP (Peter Espen) writes:
>	If one upgrades to the new 128K ROM's and the double sided
>internal drive, can they still run the version 4.1 Finder and elect NOT
>to run the New HFS file system. For example, I might want to take advantage
>of many of the new 128K ROM enhancements and yet continue to run old programs
>and my currently set-up hard drive until I decide to change over to the
>HFS at a later time.

This can be done in general, but there are several pitfalls that prevent
quite a few programs from working:

1) The Standard File Package looks different and does not allow all the
same program customizations to work as did before. Also the old kludge that
way used by several programs (particularly Consulair's: Mac C and MDS Stuff)
to allow operation with the early ROMs in Jan 1984 no longer will worh with
the new Standard File, symptom of this is no files in the dialog box even
though they are really there. If you don't install the update on the disk
some of these problems may not occur (I haven't tested that case extensively)

2) System startup is different, system INIT resources are executed using a
different stack location and a PurgeMem is done on the system heap after
executing all INIT resources. This means some RAM disk and Disk Cache
programs will not work.

	Tom Hedges
_________________________________________

CIS:		74676,1030
US Mail:	377 Bowen Ave
		Aptos, CA  95003

(P.S. Bryan, It is me, but I cannot reply to your mail....)