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Text File  |  1990-04-20  |  3KB  |  44 lines
  1. ***********************************************************************
  2. *                                                                     *
  3. *    File Name: DFH3.COM        ZAP NUMBER 1                          *
  4. *                                                                     *
  5. *    Patch to move the initial entry point address from 0012:0000.    *
  6. *                                                                     *
  7. *    Reason:                                                          *
  8. *       There may come a time in the future when INT 48 and 49 are    *
  9. *       used by another software product. This will require that the  *
  10. *       initial entry address be changed.                             *
  11. *                                                                     *
  12. *    Table of Entry points I found available with MS-DOS 3.2          *
  13. *       address     INT              address      INT                 *
  14. *         11:0     44/45              17:0       5C/5D                *
  15. *     ==> 12:0     48/49              18:0       60/61                *
  16. *         13:0     4C/4D              19:0       64/65                *
  17. *         14:0     50/51              1A:0       68/69                *
  18. *         15:0     54/55              1B:0       6C/6D                *
  19. *         16:0     58/59                                              *
  20. *                                                                     *
  21. *    Description:                                                     *
  22. *       This patch changes the initial entry point address.           *
  23. *       To use, change the value at REP 0CFD 12 to the new            *
  24. *       entry point and run PC-ZAP DFH3.Z01.                          *
  25. *                                                                     *
  26. *                                                                     *
  27. *    Applied:                                                         *
  28. *           mm/dd/yy by:                                              *
  29. ***********************************************************************
  30. NAME DFH3.COM
  31. * MODULE VERSION VERIFICATION
  32. VER 0030 56657220332E352032304170723930     "Ver 3.5 20Apr90"
  33. * PREREQUISITE ZAPS: NONE
  34. * CO-REQUISITE ZAPS: NONE
  35. * VERIFY CURRENT VALUE
  36. VER 0DAE 0E          PUSH CS
  37. VER 0DAF 1F          POP  DS
  38. VER 0DB0 B8          MOV  AX,0012H
  39. * REPLACE WITH NEW VALUE
  40. REP 0DB1 12  The "12" is the entry point address used by GWBASIC
  41. * ZAP NUMBER: 1
  42. REP 0051 40            (REINSTALLABLE)
  43. END
  44.