Routines
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24667: Check High Score
Used by the routine at GameOver.
Compares the score with the high score, one byte at a time starting with the most significant. If the score is higher then it is copied over the high score.
CheckHighScore 24667 LD DE,24136 Point DE at the byte before the high score (24136), as the pointer is incremented before each byte is compared.
24670 LD HL,24139 Point HL at the byte before the score (24139), as the pointer is incremented before each byte is compared.
24673 LD B,3 Set the byte counter to 3 as the scores are held in three bytes.
CheckHighScore_Loop 24675 INC HL Move on to the next byte of the score.
24676 INC DE Move on to the next byte of the high score.
24677 LD A,(DE) Compare the byte of the high score with the same byte of the score.
24678 CP (HL)
24679 JR C,NewHighScore If the score byte is higher than the high score byte then jump to NewHighScore, as there is a new high score.
24681 JR Z,CheckHighScore_Skip If the two bytes are the same then jump to CheckHighScore_Skip to compare the next byte.
24683 RET NC Return if the score byte is lower than the high score byte.
CheckHighScore_Skip 24684 DJNZ CheckHighScore_Loop Decrease the byte counter by one and loop back to CheckHighScore_Loop until all three bytes have been compared.
A new High Score has been made, so update HighScore.
NewHighScore 24686 LD B,3 Set the byte counter to 3 as the scores are held in three bytes.
24688 LD HL,24140 Point HL at the score (Score_1).
24691 LD DE,24137 Point DE at the high score (High_Score).
NewHighScore_CopyLoop 24694 LD A,(HL) Copy a byte of the score to the high score.
24695 LD (DE),A
24696 INC HL Move on to the next byte of the score.
24697 INC DE Move on to the next byte of the high score.
24698 DJNZ NewHighScore_CopyLoop Decrease the byte counter by one and loop back to NewHighScore_CopyLoop until the whole score has been copied.
24700 RET Return.
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