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From: shawn@marilyn.UUCP (Shawn P. Stanley)
Newsgroups: comp.sys.apple,comp.sys.apple2
Subject: GS/OS / ProDOS 8 SSC
Message-ID: <35@marilyn.UUCP>
Date: 20 May 90 15:45:58 GMT
Followup-To: comp.sys.apple
Organization: Litfal
Lines: 34

Ack!  I need help here.  I'm trying to help someone link their software
with my software across GS/OS and ProDOS 8.  Their application is a
ProDOS 8 application, and mine runs under ProDOS 16 and GS/OS.

The problem is that they're using a modem card that adheres to the
Super Serial Card standard, and thus as far as *I* know, there isn't a
way to turn off SSC interrupts between applications.  (Is there?)

What happens is, when an online user is exiting the ProDOS 8 application
and entering the GS/OS application (or vice-versa) and hits a key (or
line noise occurs), an unclaimed interrupt condition occurs and crashes
the system.

I grab an interrupt vector for use during SSC handling under GS/OS, and
I've tried to implement a tool which will continue to accept characters
until the ProDOS 8 application tells it to shut up and hand over control.

The problem is that during the switch from GS/OS to ProDOS 8 (and
vice-versa), the interrupt vector is reset, which means my tool no longer
has control over handling the interrupts.

Is there a vector that won't be reset, which I can use for such
interrupts?  Is there a way to turn off SSC interrupts without dropping
the online user?  An answer to either one will help greatly.  I haven't
been able to find an answer in any documentation I have, so maybe an
Apple person can help me find an answer if nobody else can.

(By the way, the only SSC interrupts I'm processing are receive-ints.)

If you reply by E-mail, note the address down below.  (I don't have the
ability to fix my domain under news yet.)
--
Shawn P. Stanley         shawn@marilyn.marilyn.mn.org
bungia!marilyn!shawn     {rosevax,crash}!orbit!marilyn!shawn