SHELL.MAK is the Microsoft Make file. Requires Borland Assembler and Microsoft Make. The make file FSHELL.MAK builds foreground versions of the 8253 Timer interrupt based drivers. The source code to all DigPak sound drivers is in the single file SHELL.ASM. It is conditionally assembled to produce all of the many versions of the DigPak sound drivers. You can call me at either: 314-926-0232 to discuss any of the code. Any changes to this source code MUST be referred back to me. My CompuServe account number is 70235,3237. My address is: 747 Napa Lane St. Charles, MO 63304 BBS # at: 314-939-0200 As per the agreement you should have signed, this source code is to be used by The Audio Solution DigPak licensees for maintenence purposes ONLY! Thanks, John W. Ratcliff