Path: utzoo!attcan!uunet!husc6!purdue!iuvax!bobmon
From: bobmon@iuvax.cs.indiana.edu (RAMontante)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: **** WANTED **** BINARY FILE COPY PROGRAM
Message-ID: <59873@iuvax.cs.indiana.edu>
Date: 22 Sep 90 15:44:00 GMT
Organization: malkaryotic
Lines: 21

MSDOS DEBUG will do this, albeit not "conveniently".  Give yoyr source file
a name extension that isn't either "com" or "exe", load it into DEBUG, then

    1)	name a target file:
		N target.bin

    2)	put the desired writing length in the CX register:
		RCX
		1234
	(That was a hex value.  Upper bits go into the BX register, if
	 you need to write more than 0xffff bytes.)

    3)	write starting at the desired offset in the file:
		W 0100

    4)	quit:
		Q

You now have a new file, named "target.bin", that is 0x1234 (4660 decimal)
bytes long and starts at byte 0x100 (256 decimal) of the source file.
Consult your manual for more information.