Category : Unprotects for Games and Such
Archive   : MORE_UNP.ZIP
Filename : VISICALC.TXT

 
Output of file : VISICALC.TXT contained in archive : MORE_UNP.ZIP



[[This patch was extracted from the PHOENIX IBM-PC Software
Library newsletter. They received it from the HAL-PC users group of
Houston, TX. Corrected by Jack Wright. Many thanks to them.]]

**** CONVERT VISICALC TO A .COM FILE ****

USE THE FOLLOWING PROCEDURE TO TRANSFER THE 80-COLUMN VISICALC PROGRAM
FROM THE VISICALC DISK AND WRITE A STANDARD .COM FILE WHICH MAY BE
LOADED ON A NON-STANDARD DISK DRIVE (WINCHESTER, 8", ETC).

FORMAT A DISK AS FOLLOWS: (FORMAT B:/S(ENTER)).
START THE DEBUG SYSTEM.
INSERT THE VISICALC DISK IN DRIVE A:
THEN TYPE:

-L 100 0 138 2 (LOAD THE VC80 LOAD/DECRYPTER)
-M 0 3FF 7000 (DUPLICATE IT IN HIGHER MEMORY)
-R CS (INSPECT COMMAND SEGMENT REGISTER)

DEBUG WILL RESPOND WITH THE CONTENTS OF THE CS REGISTER (eg. 04B5) AND
PROMPT WITH A COLON (:). TYPE THE OLD CONTENTS + 700 (HEX). (eg. 04B5
BECOMES 0BB5). DO THE SAME WITH THE 'DS' REGISTER.
DEBUG response to R CS might be:

CS 04B5 <-Save the value you get, we'll need it later.
:0BB5 <-Type in your CS value + 700hex here
-R DS <-Type
DS 04B5
:0BB5 <-Type in your DS value + 700hex here

NEXT:
Take the low order byte of the CS you saved above and substitute it
for LL in the next line. Substitute the high order byte for HH:

-E 107 LL HH (ENTER BYTE-FLIPPED CS) Ex: -E 107 B5 04
-E 24D BB A8 00 90 (HARD-WIRE THE DECRYPTION KEY)

NOW, WE MUST RUN THE LOADER/DECRYPTER, TYPE:

-G =1B8 26B (EXECUTE FROM 1B8 TO 26B)

THE ENTIRE PROGRAM WILL NOW BE LOADED AND DECRYPTED AND A REGISTER DUMP
SHOULD APPEAR ON THE SCREEN. NOW RESTORE CS AND DS TO THEIR PREVIOUS
VALUES AND SET THE FILE LENGTH IN CX. Set BX=0:

-R CS
CS 0BB5 <-Yours might be different
:04B5 <-Type in the value of CS you saved above
-R DS
DS 0BB5
:04B5 <-Type in the value of DS you saved above
-R BX
BX F3FD
:0
-R CX
CX 0000
:6B64 (LENGTH = 6B64 FOR VERSION 1.1, 6802 FOR VERSION 1.0)

NOW WE MUST NAME THE FILE, WRITE IT AND EXIT.
REMOVE THE VISICALC DISK FROM A:
INSERT THE NEW, FORMATTED, EMPTY DISK IN A:
TYPE:

-N VC.COM (OR WHATEVER YOU WISH TO NAME IT)
-W (WRITE THE .COM FILE)
-Q (EXIT FROM DEBUG)
***YOU ARE DONE*****
Back in DOS, type VC to try it.








  3 Responses to “Category : Unprotects for Games and Such
Archive   : MORE_UNP.ZIP
Filename : VISICALC.TXT

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/