Spectrum ROM | Routines |
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This subroutine returns with the carry flag reset if the present value of the A register denotes a valid digit.
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NUMERIC | 11547 | CP "0" | Test against 30 hex, the code for '0'. | ||||
11549 | RET C | Return if not a valid character code. | |||||
11550 | CP 58 | Test against the upper limit. | |||||
11552 | CCF | Complement the carry flag. | |||||
11553 | RET | Finished. |
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