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From: sales AT taiserver DOT com
Newsgroups: comp.os.msdos.djgpp
Subject: 30K Timer tic interrupt handler
Date: Sat, 24 May 2008 09:58:46 -0700 (PDT)
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi

I wonder if any one has any ideas on how to tie this all together. The
faq are missing some key points

Does any one have an example of how write and install a real mode
interrupt handler. Wait - read on. The examples in the FAQ show how to
install a PM mode handler or how to install a RM handler reflected
from PM mode. We need a real mode handler

We have the timer set to 30khx interrupt rate. When it fires in PM
mode it get handled fine. If the processor happens to be in real mode
the overhead for the PM task switch is too great and the system hangs
after a couple of hits.

We have the PM handler covered. not sure how to do the real mode
handler natively.

I assume we have to :

1) I believe we would need to write the handler is asm. Can we do this
inline or must we compile separately.

2) Next we need to move the asm obj blob into real memory space - how
do you this

3) finally we need to reset the real mode vector to point to the 16bit
real mode code - i assume we can just use the dos calls to do this. In
the right order with the PM handler install of course.

Any hep would be appreciated.

Also if you rerffence a faq can you tell me which one specifically.

Feel freen to email directly

Thanks

Daniel
sales AT taiserver DOT com