90C4B8:

	LDA $09D2	;load item slot
	STA $12		;store here
	LDA $8F		;buttons newly pressed every frame
	BIT $09B8	;item cancel
	BEQ ONE
	STZ $0A04	;we're here, because item cancel was just pressed, so
	BRA TWO		;disable the selected item

ONE:
	LDA $8B		;controller input, buttons held
	BIT $09B8	;again, item cancel
	BNE THREE
	STZ $16		;auto cancel is not active
	BRA HERE

THREE:
	LDA #$0001	;turn auto cancel on
	STA $16		;temp flag
HERE:
	LDA $8F		;buttons newly pressed this frame
	BIT $09BA	;item cancel
	BEQ FOUR
	LDA $09D2	
	INC a
	CMP #$0006	;check if selected item number exceeds the limit of 5
	BMI FIVE	;Branch if minus, ie we are below the limit

TWO:
	LDA #$0000	;store zero to the selected item, when item cancel was just pressed/item limit exceeded
FIVE:
	STA $09D2	;Store to 'current item selected'
SEVEN:
	ASL a
	TAX
	JSR ($C539,x)	;executes code - this handles the skip, sets carry if there's either no ammo, no grapple/xray, or simply no item has been selected
	BCC SIX
	LDA $09D2
	INC a
	STA $09D2	;count up one slot (= skip item when ammo is empty/item is not selected)
	CMP #$0006 	;but keep within 5 items, else quit!
	BMI SEVEN
	LDA #$0000
	STA $09D2	;if you run out of bounds, disable items
	BRA SEVEN
SIX:
	LDA $16		;0 if auto cancel off, 1 if on
	BEQ NINE	;check if auto cancel is on?

	LDA $09D2	;puts selected item into the auto cancel array
	STA $0A04
	BRA FOUR

NINE:
	STZ $0A04	;disable auto cancel
FOUR:
	LDA $09D2	;dunno how arm cannon opening is handled atm
	CMP $12		;probably somewhere else
	BNE TEN		;only thing that I can tell is that this routine
	LDA $0AAA	;stores the flags needed to 'open' the arm cannon
	INC a
	CMP #$0003	;branch if arm cannon sprite is fully opened (frame 3)
	BMI ELEVEN
	LDA #$0002
ELEVEN:
	STA $0AAA	;part of arm cannon opening animation (frame 2)
	BRA TWELVE
TEN:
	LDA #$0001	;same here (frame 1)
	STA $0AAA
TWELVE:
	PLP
	RTS

90C539:

C545	;no item - stores zero to various offsets, resets samus's palette, CLC and RTS
C551	;missile - if missiles are empty, do the same as above, else SEC and RTS
C564	;super missile - same with supers
C577	;powerbomb - same with Powers
C58A	;grapple - if grapple hasn't been collected SEC RTS else CLC RTS
C5AE	;xray - same with xray