Fake Keyboard

 BBS: Inland Empire Archive
Date: 08-07-92 (08:36)             Number: 189
From: ROBERT CHURCH                Refer#: NONE
  To: SUNNY MARUELI                 Recvd: NO  
Subj: Fake Keyboard                  Conf: (1) 80xxx

SM> Does anyone know how programs like 4DOS's KEYSTACK , fakes keyboard
SM> activity? I know there is an undocumented way to do that, but how ??

This is a message I clipped from QUIK_BAS.  Read it.

 Area:    QuickBASIC
 Date:    27 May 92  08:03:00  Public
 From:    Craig Palazzo
 To:      Max Campos
 Subject: Key-Fake
Ä
Max:

Thanks for the fast reply.  I have since the message found
a way to "Key - Fake"
or pack the keyboard buffer on exit of a program.  The trick was to
know the begining and ending memory locations of the buffer and what mem
segment it resides in.  The buffer is located at Seg 0 and locations are as
follows

1050.....The start pointer. Poke this with the value 30 to clear buffer
1052.....Ending pointer. Poke a value between 32 and 46
1054.....This is the buffer which is 16 characters long.

Example:

DEF SEG 0........Puts us in MEMORY segment 0 or DOSville
POKE 1050, 30...."clear buffer"
POKE 1052, 34...."or anynumber between 32 and 46, 32 is one character 46 being
               8 characters. Note it takes two poke statements to produce
           one character.  So the differance between 30 and 34 is 4
     which sets the buffer to except the next 4 characters or 2
 keyboard characters.

POKE 1054, ASC("W")
POKE 1055, ASC("W") Note these two statements produce the ASCII char W
POKE 1056, ASC("P"
POKE 1057, ASC("P") This produces the P
DEF SEG...........Returns us to segment of origin "commonly Dgroup"
SYSTEM

This produces WP on the command line and would run the first WP executible
file defined in the path.  The reason for poking the character twice is that
DOS sees the first as a Keyboard scan code and the secound as the ASCII value.
By adding 13 (code for enter key) to the end of our program we can the exit
and have the PC run WP with no other keystrokes.

Thanks again! Peace

                              -=CMP=-

-+- Maximus 2.01wb
 + Origin: |=[Bloom Co. Hospital>=--- |[GRapids,MI] (616)361-8345 (1:228/26)

    -Rob

--- GoldED 2.40
 * Origin: Rob Church's Point, Hillsboro, Oregon. (1:105/319.27)