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From: neil@hwcs.UUCP
Newsgroups: comp.sys.atari.st
Subject: The Ultimate in Pexec?
Message-ID: <1461@brahma.cs.hw.ac.uk>
Date: Thu, 1-Oct-87 09:21:41 EDT
Article-I.D.: brahma.1461
Posted: Thu Oct  1 09:21:41 1987
Date-Received: Sun, 4-Oct-87 01:46:20 EDT
Organization: Computer Science, Heriot-Watt U., Scotland
Lines: 26
Keywords: Restoring Default Vectors


Here is a teaser: Suppose I write a program that needs an immense amount
of ram (~850K). I compile/assemble & link the beast, but when I try to run it
I don't have enough memory due to the accessories & foldrxxx.prg. I could
load it at an absolute address and relocate it myself. Lets simplify things
a bit and say that it will be a .TOS program so I don't have to worry about GEM
and desk accessories. So far so good but here comes the snapper. If any of the
already resident programs have grabbed any interrupt/event driven code then
when I stamp over it KAPOWW! (as Batman used to say) and bombs all round.
So how can I restore the original vectors in an OS independant way?
I don't mind having to reboot after I have finished using the program all I
want is to run the thing.


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"I think all right thinking people in this country are sick and tired of being
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 Neil Forsyth                           JANET:  neil@uk.ac.hw.cs
 Dept. of Computer Science              ARPA:   neil@cs.hw.ac.uk
 Heriot-Watt University                 UUCP:   ..!ukc!cs.hw.ac.uk!neil
 Edinburgh
 Scotland
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