New_High_Score ($F8D8)

This routine compares a players score string, pointed to by the X register, to the current hi score, pointed by the U register. If the player's score is higher than the currently saved hi score, then the player's score will be copied into the hi score buffer pointed to by the U register.

ENTRY:

X-reg points to a player's score stringX-reg points to double-sized coordinate pair

U-reg points to the high score string (usually $CBEB?)

EXIT:

X-reg, U-reg, D-reg trashed

Source