Last revision: June 8, 1986 at 9:01
   
   by: H.M. Van Tassell

Several programs for the PC have their own complex keyboard handlers and
some of these don't take into account that a few folk have keyboards other
than the standard IBM type. Now that there is a new style IBM keyboard,
it is kinda sadistic fun to watch the authors of these programs squirm,
but that really doesn't help us poor SOBs with 5151 type keyboards. Word,
Framework II, and Windows are in this category.

Microsoft's WORD (version 3.0) assumes that you don't want the Num Lock
key on so the little bugger just up and turns it off when the program 
starts up.  Well, if you have a Num Lock light and/or a cursor keypad,
things get out of phase. Suddenly the cursor key pad is turned into a
number keypad and the cursor keys are back on the number pad. The helpful
keyboard lights are suddenly not synchronized with the computer.  I first
wrote a little Num Lock toggle program called NUMLOCK.COM and included
in this ARC file. That worked but you had to drop down to the operating
system shell to run it. Then I patched WORD.COM to not reset the Num Lock
bit on startup.  The patching technique used is shown below. 


Short, quick, and simple version.
---------------------------------

Copy WORD.COM to WORDTEMP.COM and invoke debug as follows:

>DEBUG WORDTEMP.COM

Next check a couple of bytes and make change if all looks OK 

-E 39BA         ;press RETURN

               +-------+-------- Press space bar to skip
              /       /
1C60:39BA  17.     00.     CF.EF
                               \__ change the CF to EF, press RETURN

-W              ; press RETURN 

All done, now test it out.


"Educational" version for would be hackers  (giggle)
------------------------------------------

Look for the masking of the the keyboard byte stored at
location 0040:0017 in BIOS memory, then change it to not
mask off the Num Lock bit.

>DEBUG WORDTEMP.COM             ; startup DEBUG with WORDTEMP.COM
                                ; USE a COPY of WORD.COM 

-S 0 a000 17 00                 ; Search for 0017

1C60:39BA                       ; hmmm, found it twice,
1C60:3FF7

-U39b2                          ; Un-assemble code near the first find

1C60:39B2 B84000         MOV	AX,0040 
1C60:39B5 8EC0           MOV	ES,AX 
1C60:39B7 2680261700EF   AND	Byte Ptr ES:[0017],CF 
                                                  
        ; here is where the Num Lock and Scroll Lock bits are
        ; masked off, so lets change it. CF hex = 1100 1111 binary
        ; Scroll Lock is bit 4, Num Lock is bit 5,  EF = 1110 1111

-E39ba                          ; get ready to make a change
               +-------+-------- Press space bar to skip
              /       /
1C60:39BA  17.     00.     CF.EF
                               \__ change the CF to EF, press RETURN

-W                              ; write the changed file to disk 

Writing ADD2 bytes
-Q                              ; all done, ready to test WORDTEMP.COM


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