Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!usc!petunia!news
From: araftis@polyslo.CalPoly.EDU (Alex Raftis)
Newsgroups: comp.sys.apple2
Subject: Help with Programmable Drivers
Message-ID: <27430daf.2a61@petunia.CalPoly.EDU>
Date: 15 Nov 90 21:50:39 GMT
Reply-To: sjacques@polyslo.CalPoly.EDU (Shawn D. Jacques)
Organization: Cal Poly State Univ,CSC Dept,San Luis Obispo,CA 93407
Lines: 24



Question for all you IIgs C wizards:

I'm writing a program that I would like to be able to load drivers for. I 
know it's possible to load them on a IIgs, but I don't know have much of 
an idea of where to start. Ie, what's the basic code to do such I thing 
such as using what calls to the system loader must be made, and how to I
get my code in memory to recognize the driver's entry points? Pseudocode 
or actual code would be appreciated. Also, when are the limitations of 
doing this? Can I only call to the loaded segment or can that segment 
call functions in my main program code. Also, would this segment be able 
to access global program variables, and can the global program access 
local variables in the driver?

PS. if you care, I'm writing a terminal program (yet another one) and I'd
like to support drivers and terminal emulations that a user could write.



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