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Routines |
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Used by the routine at StartGame.
Part of the tape protection. The Z80 keeps bit 7 of R as it was last written, and the tape loader leaves it set. If the game was started any other way then bit 7 is clear and the machine is reset.
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Reset the machine if bit 7 of R is clear.
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| CheckProtection | A8F1 | LD HL,$0000 | Point HL at START. | |
| A8F4 | LD A,R | Fetch R. | ||
| A8F6 | RLA | Move bit 7 into the carry flag. | ||
| A8F7 | RET C | Return if the bit is set. | ||
| A8F8 | JP (HL) | Jump to START. | ||
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