Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!xanth!nic.MR.NET!umn-cs!bungia!orbit!pnet51!shawn
From: shawn@pnet51.cts.com (Shawn Stanley)
Newsgroups: comp.sys.apple
Subject: Re: IIgs Firmware Question
Message-ID: <925@orbit.UUCP>
Date: 12 Apr 89 02:25:06 GMT
Sender: root@orbit.UUCP
Organization: People-Net [pnet51], Minneapolis, MN.
Lines: 19

hentosh@amethyst.bucknell.EDU writes:
>When using the IIgs firmware to access the serial-ports, the Firmware Reference
>says that you must be in emulation mode and the DBR must be $00. Does the
>processor have to be in emulation anytime the firmware is servicing interupts
>or just when you access the firmware to get the next byte or send the next byte
>etc...

For more information on how exactly interrupt handlers leave you sitting,
check out the firmware reference.  If you would care to explain exactly what
you wish to accomplish, I could take a stab at answering your question about
interrupts.

It's possible to call the firmware routines via the misc. toolset FW_Entry
(firmware entry) call.  You can do this from native mode without worrying
about the particulars for setting up the calling environment, DBR, etc., then
fixing them.

UUCP: {uunet!rosevax, amdahl!bungia, chinet, killer}!orbit!pnet51!shawn
INET: shawn@pnet51.cts.com