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AST RESEARCH TECHNICAL BULLETIN TB-0214A 09/19/86
PATCH TO ACCESS THE LEARN MENU ON TANDY 1000
While the Tandy 1000 appears to be a very IBM compatible machine
in most respects, it appears that there is a difference with
respect to the keyboard such that users cannot bring up the
DESQview Learn menu on the Tandy 1000. This feature is accessed
by holding down the shift key and then tapping the Alt key. This
problem does not seem to occur on the Tandy 1200.
Tandy 1000 users who want to be able to access the Learn menu
should be able to do so by installing the following patch. It
redefines the activating key sequence to Control-Alt. Users who
are experiencing similar problems on other compatibles may find
this will work for them also.
To create the patched DESQview file, you will need a copy of the
DOS utility DEBUG.COM. This can be found on your DOS
Supplemental directory.
The patch:
1. Copy your DV.EXE file to a backup file. In case the patch
doesn't work, you can restore the original and you will be no
worse off.
C:\dv>COPY DV.EXE DVBACK.EXE
2. Rename your DV.EXE to DV.XXX so that it may be patched. This
is necessary so that DEBUG will load the file properly.
C:\dv>REN DV.EXE DV.XXX
3. Enter DEBUG using the DV.XX parameter.
C:\dv>DEBUG DV.XXX
Debug will load the program and present you with a hyphen as
a prompt. To this prompt, type an "R" and hit the Enter key.
You will be presented with a display similar to the one shown
below. It is not necessary that you understand this (aren't
you glad?).
-R
AX=0000 BX=0001 CX=BBAO DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=???? ES=1F87 SS=1F87 CS=1F87 IP=0100 NV UP DI PL NZ NA PO NC
1F87:0100 4D DEC BP
4. In the space following the "DS=" in your display, which in
the example above contains "????", you will see four alpha-
numeric characters. Take note of these characters and to the
hyphen prompt, type "H" followed by a space, when the number
following the "DS=", then another space and "1000" as
illustrated below. Follow this by hitting the Enter key and
you will see two sets of characters shown below as "XXXX" and
"YYYY". Only the "XXXX" will be used for the patch.
-H ???? 1000
XXXX YYYY
5. Now to the hyphen prompt type "S", the four characters shown
in "XXXX" above and ":0 FFF0 F6 06 17 00 03" as shown below
and hit the Enter key.
-SXXXX:0 FFF0 F6 06 17 00 03
????:????
6. Debug should return two sets of four characters each
separated by a colon. This is shown above as "????:????".
If DEBUG returns to the hyphen prompt without returning this
set of characters, this patch will not work on your copy of
DESQview and you should type "Q" and hit Enter to quit DEBUG.
If it did return the characters, continue:
To the hyphen prompt, type "E" followed by the characters
shown above as "????:????" Then hit the Enter key. DEBUG
will respond with a line ending with "F6" and an underline
cursor. Press the space bar and a "06" will appear as shown
below. Keep pressing the space bar until "03" appears with
an underline prompt following it. To this prompt, type "04"
and then hit the Enter key.
-E????:????
????:???? F6. 06. 17.
????:???? 00. 03.04
7. Debug will return to the hyphen prompt. To this prompt, type
"W" and hit the Enter key. Your disk will light up and Debug
will indicate that it is writing a given number of bytes that
may or may not match the example below.
-W
Writing 1BBA0 bytes
8. At this point, the patch is complete and the file has been
written to disk. Return to DOS by typing "Q" and hitting
return.
-Q
C:\DV>REN DV.XXX DV.EXE
9. Finally, rename DV.XXX to DV.EXE (shown above) and then
enter DESQview. If your patch has been successful, you
should now be able to access the Learn menu by holding down
the Control key and tapping the Alt.
If the patch does not work, delete DV.EXE and try again using
the DVBACK.EXE file.