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- To use this device driver:
-
- (1) Add a line device=<path>labhelp.sys to config.sys and reboot.
-
- (2) Look at test.c and understand what is happening in main. You can scan
- the subroutine, but it's operation is pretty much irrelevent.
-
- (3) Run test as an example program only in a full screen OS/2 session - never
- in a window. It will gain access to the video screen memory and overwrite
- everything with 0's.
-
- (4) Be careful with where you access memory. The length descriptor in the
- call has a granularity of 4096 bytes (on page) as far as I can tell.
- I've been able to write beyond my requested block (to that limit) with no
- problem.
-
- To use the Microsoft C6.0A compiler, you must #define MSC60 in the file test.c,
- and then compile with recommended options /AH /Za /W3 /FPi /G2. Probably also
- have to #define NO_DEVELOPERS_KIT in test.c unless you have the developer's
- toolkit installed.
-