AUT midpoint reset (not full patch)

;; Midpoint reset code - resets midpoints if Select+L is pressed
; again, this routine needs to run on the overworld

LDA $15         ; load controller data 1
AND $17         ; bitwise AND with controller data 2
AND #$20        ; filter out bit #$20 (Select in $15, L in $17)
BEQ +           ; if either bit is unset, don't reset

LDx $13BF       ; translevel number
LDA $1EA2,x     ; load overworld flags for current level
AND #$40        ; midpoint flag
BEQ +           ; if midpoint flag is not set, skip

LDA $1EA2,x
AND #$BF        ; clear midpoint flag
STA $1EA2,x

LDA #$00        ; load 00 since there's no 24-bit STZ
STA.l !RAM_MIDWAY,x ; clear multi-midpoint number

LDA #$08        ;\ play spin-jump kill sound effect
STA $1DF9       ;/

+