Path: utzoo!attcan!uunet!cs.utexas.edu!asuvax!ncar!mephisto!prism!gt4662b
From: gt4662b@prism.gatech.EDU (BRANHAM,JOSEPH FRANKLIN)
Newsgroups: comp.sys.apple2
Subject: Re: pipes (implementation thereof)
Summary: Interrupt?
Message-ID: <7397@hydra.gatech.EDU>
Date: 23 Mar 90 18:14:49 GMT
References: <2284@tellab5.tellabs.com>
Organization: Georgia Institute of Technology
Lines: 22

In article <2284@tellab5.tellabs.com>, toth@tellab5.tellabs.com (Joseph G. Toth Jr.) writes:
> First of all - in order to provide multi-tasking (which is refered to in
>    the articles), the OS/Shell would have to work using interrupts.  Most
>    owners of Apples (][, ][+ //e - The //c includes a mouse interface which
>    can generate timing interrupts) don't have clocks or mouse controllers
>    to provide the timing interrupts required to provide multi-tasking.
> 

This is probably pretty irrelevant to the discussion at hand, but I recently
bought my father a copy of Geos for the Apple //e //+. I didn't look at the
documentation overly much, but the program requires the use of interrupts.
In fact, for the //e user without a mouse card, a tiny little interrupt
handler which plugs into slot 7 is provided. It had about 4 generic LS
chips on it and looks like it could be built for about $20 from scratch.



-- 
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<  FRANK BRANHAM                      | "I exist; therefore I am."             >
<  Georgia Institute of Technology    |       -The Patchwork Quilt             >
<  Internet: gt4662b@prism.gatech.edu |   	by August Derleth              >