|
Routines |
| Prev: 49593 | Up: Map | Next: 49661 |
|
Used by the routine at StartGame.
Fills the 34 bytes at ItemsLeft_Tiles with random numbers from 16 to 31, taken from a random place in the ROM.
The routine then makes the second part of the copy protection check: it returns if bit 7 of the memory refresh register is set (the loader sets it, see Decryption), and resets the computer if not.
|
||||
| BuildRandomTable | 49627 | CALL IncrementFrameCounter | Update the frame counter and the random number generator. | |
| 49630 | LD HL,(48042) | Fetch the random number. | ||
| 49633 | LD A,H | Turn it into the address of a random place in the first 4096 bytes of the ROM. | ||
| 49634 | AND 15 | |||
| 49636 | LD H,A | |||
| 49637 | LD DE,48080 | Point at the table of random numbers. | ||
| 49640 | LD B,34 | Set the length of the table to 34 bytes. | ||
| BuildRandomTable_Loop | 49642 | LD A,(HL) | Copy a byte of the ROM into the table, after making it a number from 16 to 31, and loop back until the table is full. | |
| 49643 | INC HL | |||
| 49644 | AND 15 | |||
| 49646 | OR 16 | |||
| 49648 | LD (DE),A | |||
| 49649 | INC DE | |||
| 49650 | DJNZ BuildRandomTable_Loop | |||
| 49652 | LD A,R | Return if the loader has set bit 7 of the memory refresh register. | ||
| 49654 | BIT 7,A | |||
| 49656 | RET NZ | |||
|
This entry point is used by the routine at CheckPlayerDead.
The memory refresh register has not been set up by the stub, so the game has been tampered with. Reset the computer.
|
||||
| BuildRandomTable_Reset | 49657 | XOR A | The game has been tampered with, so reset the computer. | |
| 49658 | LD L,A | |||
| 49659 | LD H,A | |||
| 49660 | JP (HL) | |||
| Prev: 49593 | Up: Map | Next: 49661 |