Routines
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63313: Advance HL to byte after first zero from address in HL onwards
Used by the routine at 42616.
Input
HL Pointer to search starting point
Output
HL Pointer to byte after first zero at or after HL input
63313 PUSH BC Store BC
63314 LD BC,65535 Set range to 65535
63317 XOR A Load A (value to search for) with zero
63318 CPIR Advance HL to byte after first zero found
63320 POP BC Restore BC
63321 RET Return
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