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From: g-man@flowzone.EBay.Sun.COM (Luis Navarro)
Newsgroups: comp.windows.ms.programmer
Subject: windows & assembly level interrupt handlers
Keywords: midi, assembly, interrupts, help!
Message-ID: <972@grapevine.EBay.Sun.COM>
Date: 4 Mar 91 09:43:24 GMT
Sender: news@grapevine.EBay.Sun.COM
Reply-To: g-man@EBay.Sun.COM (Luis Navarro)
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Organization: Sun Microsystems Federal, Inc., Milpitas, CA, USA
Lines: 31

I am trying to write a Windows 3.0 application that uses an assembly
level interrupt handler to handle MIDI (musical instrument digital 
interface) input/output and am having some serious problems with the
data interfacing.  Please read on if you are familar with all or any of 
the following as they relate to windows programming:

	1. MIDI 
	2. interrupt handlers
	3. assembly level routines communicating with Windows C code

The following are some more details regarding what I'm trying to do, as
well as the problems I'm experiencing:

I have obtained some C/assembly code originally written for interrupt
driven MIDI communcations in DOS.  The assembly level stuff consists of
the interrupt handler (an interrupt is generated for every MIDI byte that
arrives at the MIDI interface) and the data i/o.  The C code uses the
assembly routines to do the rest.  Now I am trying to use this assembly
code in a relative simple windows program and am having some great 
difficulties.

My main objective is to modify the already existing assembly/C code so
that the interrupt handler will post a windows message (encapsulating the
current MIDI data byte in the message).  How does one go about doing this?

Furthermore, the interrupt handler appears to work in real mode, but not in 
standard or 386 as if the data buffer (created and declared in the assembly
code) was empty or if interrupts suddenly weren't being generated at all. 
Any ideas, advice, or general pointers would be greatly appreciated.

--Luis (g-man@EBay.Sun.COM)