Compare_Score ($F8C7)
This routine will compare two BCD score strings, to determine which one is higher. The two strings are pointed to by the U and X registers. Depending upon how the scores compare, one of the following values will be returned in the A-register:
1) The scores are the same: a = 0
2) X score > U score: a = 1
3) U score > X score: a = 2
ENTRY:
X-reg points to first score string (terminated with $80)
U-reg points to second score string
EXIT:
A-reg returns result of the compare
B-reg trashed