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- -------------------------------------------------------------------------------
- 910710 COM-AND Script Overlay Page 1
- -------------------------------------------------------------------------------
- Included in this release is a file overlay archive. It contains:
- -------------------------------------------------------------------------------
-
-
- OVERLAY.ASM
-
- Assembler source file. Compile with "MASM OVERLAY;". This file
- defines two overlay routines, one to display a string through
- BIOS, and a second to return the segment address.
-
- OVERLAY.OBJ
-
- MASM output from compilation of OVERLAY.ASM. Link with the
- command "LINK OVERLAY;" to create EXE file.
-
- OVERLAY.EXE
-
- LINK output. Not directly executable! Properly, would be renamed
- to OVERLAY.OVL to prohibit running from the DOS prompt. Convert
- to COM format with the command "EXE2BIN OVERLAY.EXE OVERLAY.COM".
-
- OVERLAY.COM
-
- EXE2BIN output. Not directly executable! Could be renamed as
- OVERLAY.OVL (as above) to prohibit running from the DOS prompt.
- Whether the COM or EXE file is used, the script must have the
- proper file name for the executable.
-
- OVERLAY.CMD
-
- COM-AND script to use OVERLAY.EXE or OVERLAY.COM. This script,
- when invoked, loads the OVERLAY.EXE (or COM if you change it),
- and then invokes the two entry points in the overlay.
-
- --------------------------------------------------------------------
- This overlay requires no 'cleanup' on termination. Therefore the
- script that loads it does not set an exit script to terminate the
- overlay in an orderly manner. Similarly, no end-entry address is
- specified in the OVERLAY statement for execution upon termination.
-
- Albeit not a very interesting function proper, OVERLAY demonstrates
- the coding and use of machine language subroutines to COM-AND scripts.
- Overlays may be coded to interface DOS and BIOS interrupts, or more
- sophisticated modules such as the demonstration TALKER.*. Enjoy!
-