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From: hoffman@pitt.UUCP (Bob Hoffman)
Newsgroups: net.micro.cpm
Subject: Re: Calling infinity.  Are you there?
Message-ID: <535@pitt.UUCP>
Date: Mon, 26-Mar-84 13:37:57 EST
Article-I.D.: pitt.535
Posted: Mon Mar 26 13:37:57 1984
Date-Received: Wed, 28-Mar-84 07:32:57 EST
References: aplvax.516
Lines: 12

I have written code like that (call 0 surrounded by push/pop) when
doing direct BIOS calls.  The address of the BIOS routine is not
known until runtime, and is calculated by looking at the address
contained at 0001 and 0002, and adding the offset into the BIOS jump
table.  If you found this code in a source file, look for someplace
where the effective address of the CALL is written into.  If you are
looking at a COM file, try starting the program and then dumping back
out to CP/M, save the memory image, and look at that address again.  It
will probably have a BIOS entry address in it.

	Good luck,
	---Bob.