[NTLK] AW: System Update

From: Johannes Wolf (jwolf_at_xe.estec.esa.nl)
Date: Thu Sep 20 2001 - 02:34:42 EDT


Paul,

You mean a "normal" system ROM, just having a different version to the one which was installed before?
And where you can get such a ROM from?

Johannes
-----Ursprüngliche Nachricht-----
Von: Paul Guyot [SMTP:pguyot_at_kallisys.net]
Gesendet am: 19 September 2001 15:43
An: newtontalk_at_newtontalk.net
Betreff: Re: [NTLK] System Update

>Paul would know, AFAIR he's the only one who ever managed to remove the
>system update but killed his Newt in the process.

Actually, no, my Newton (and another unit) was killed because it had
a corrupted system update (well, in fact, what was corrupted was the
system update installer) which I haven't been able to remove.
To remove a system update (and go back to the state where no system
update is present), you have to execute some code and call several
functions in the ROM.
This code can *normally* be executed in two cases:
a/ you install a special package doing the job (but then, the
installed system update should work well enough to let you install
packages and execute them, it wasn't my case)
b/ you install a ROM (written by Apple) which will detect that there
is a system update but it was installed while another ROM was there
and therefore it will erase it (it will also erase the internal store
for the same reason).

But in fact, there is no good reason to remove a system update.
System updates only install on the Newtons they're supposed to run
on. All system updates by Apple seems to work properly and I haven't
had any bug report with the 710031 I've created. Software must not
rely on the system update ROM version string or patch level or
whatever. Well, the only thing that they could rely on (although I
still can't see any reason for that) is the system patch numerical
version by requiring a minimum which increases with every system
update (and 710031's is bigger than Apple's).

Paul

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