Routines
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46770: Compare Scores
Used by the routines at NewHighScore and NewHighScore_Enter.
Compares the scores pointed to by DE and HL. They are held as three bytes, with the most significant digits first.
Input
DE Pointer to a score
HL Pointer to a score
Output
F Carry set if the score at DE is less than the score at HL. Zero set if they are equal
NewHighScore_Compare 46770 PUSH BC Stash BC, DE and HL on the stack.
46771 PUSH DE
46772 PUSH HL
Scores are held in three bytes.
46773 LD B,3 Set the number of bytes of the score in B to 3.
NewHighScore_Compare_Loop 46775 LD A,(DE) Fetch a pair of digits of the first score.
46776 CP (HL) Compare it with the pair of digits of the second score.
46777 JR C,NewHighScore_Compare_Return Jump to NewHighScore_Compare_Return if the first score is lower.
46779 JR NZ,NewHighScore_Compare_Return Jump to NewHighScore_Compare_Return if the first score is higher.
46781 INC HL Move onto the next pair of digits of both scores.
46782 INC DE
46783 DJNZ NewHighScore_Compare_Loop Decrease the digit pair counter by one and loop back to NewHighScore_Compare_Loop until all three pairs of digits have been compared.
NewHighScore_Compare_Return 46785 POP HL Restore HL, DE and BC from the stack.
46786 POP DE
46787 POP BC
46788 RET Return.
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