From: danspam2000 AT my-deja DOT com
Newsgroups: comp.os.msdos.djgpp
Subject: int 21h and assembler
Date: Mon, 06 Nov 2000 23:46:42 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I am quite new to assembler, but i need to service a hardware interrupt
very quickly, so have had to code using inline assembler code.

The problem i have is that i can't seem to get a definitive answer
about how to protect the service routine in memory. I think that i
should use int 21H, but some books and lists say to use service 48 and
some say 49, and one said 27! Also, i am not sure exactly what i need
to pass, and using which registers (some say dx and some say bx), do i
need to pass a segment or an offset, or both?

Thanks,
Dan Hartropp


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