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- IsNumber
- CMP $39
- BCC .IsNumber_Next
- JMP .IsNumber_Not
- .IsNumber_Next:
- CMP $30
- BCS .IsNumber_True
- JMP .IsNumber_Not
- .IsNumber_True:
- LDA $1 ; True
- JMP .IsNumber_Exit
- .IsNumber_Not:
- LDA $0 ; False
- JMP .IsNumber_Exit
- .IsNumber_Exit:
- RTS
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