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Text File  |  1984-12-24  |  2KB  |  39 lines
  1. This is the procedure for bypassing the copy protection scheme used
  2. by SIDEKICK version 1.11A.
  3.  
  4. Using DEBUG on SK.COM, NOP out CALL 8E8A at location 0801 ----+
  5.                                                               |
  6. and change the OR  AL,AL  at 0810 to OR  AL,01 --------+      |
  7.                                                        |      |
  8.                                                        |      |
  9.                (BEFORE ZAP)                            |      |
  10.                                                        |      |
  11. 27A3:0800 0E            PUSH    CS                     |      |
  12. 27A3:0801 E88686        CALL    8E8A  <-----------------------+
  13. 27A3:0804 2E            CS:                            |      |
  14. 27A3:0805 8E163E02      MOV     SS,[023E]              |      |
  15. 27A3:0809 2E            CS:                            |      |
  16. 27A3:080A 8B264002      MOV     SP,[0240]              |      |
  17. 27A3:080E 1F            POP     DS                     |      |
  18. 27A3:080F 59            POP     CX                     |      |
  19. 27A3:0810 0AC0          OR      AL,AL  <---------------+      |
  20. 27A3:0812 7409          JZ      081D                   |      |
  21.                                                        |      |
  22.                                                        |      |
  23.                                                        |      |
  24.                (AFTER ZAP)                             |      |
  25.                                                        |      |
  26. 27A3:0800 0E            PUSH    CS                     |      |
  27. 27A3:0801 90            NOP  <--------------------------------+
  28. 27A3:0802 90            NOP  <--------------------------------+
  29. 27A3:0803 90            NOP  <--------------------------------+
  30. 27A3:0804 2E            CS:                            |
  31. 27A3:0805 8E163E02      MOV     SS,[023E]              |
  32. 27A3:0809 2E            CS:                            |
  33. 27A3:080A 8B264002      MOV     SP,[0240]              |
  34. 27A3:080E 1F            POP     DS                     |
  35. 27A3:080F 59            POP     CX                     |
  36. 27A3:0810 0C01          OR      AL,01  <---------------+
  37. 27A3:0812 7409          JZ      081D
  38.  
  39.