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5F00: Security Check
Used by the routine at GameEntry.
The game only starts when the second byte of FRAMES is 58. If it is any other value then this returns to the caller instead of running the game.
SecurityCheck 5F00 DI Disable interrupts.
5F01 LD A,($5C79) Fetch the second byte of FRAMES.
5F04 CP $58 Return if A is not equal to 58.
5F06 RET NZ
Continue on to GameInitialisation.
View the equivalent code in;
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