====== How to add bankstick UP/DOWN buttons to mbSID v2 ======

This is another draft. Actually it's just the source code that you'll need to add :D Make sure you've read the other tutorials that cover all the stuff needed to understand this one. This is not really a great way of achieving what we want, but it's good enough for now...

  * In app_defines.h you'll need to find some space (1 byte) for a variable we'll name "BANK_STICK_NO". This variable will hold the selected bankstick.

  * In cs_menu_buttons.inc:
<code>
CS_MENU_BUTTON_BankUp
	;; do nothing if button has been depressed
	btfsc	MIOS_PARAMETER2, 0
	return
	incf   	BANK_STICK_NO, W		; increment bank, load result into w
	goto	CS_MENU_BUTTON_AssignBank

CS_MENU_BUTTON_BankDown
	;; do nothing if button has been depressed
	btfsc	MIOS_PARAMETER2, 0
	return
	decf  	BANK_STICK_NO, W 		; decrement bank, load result into w
	;; goto	CS_MENU_BUTTON_AssignBank
	
CS_MENU_BUTTON_AssignBank
	andlw   0x07 			; this keeps result from getting bigger than 7
	movwf	BANK_STICK_NO
	movwf	CS_MENU_SID_M_BANK
	movff	CS_MENU_SID_M_BANK, SID_BANK
	;; mask out 'sent' flag
	bcf		SID_PATCH, 7
	call	CS_MENU_EXEC_GoToMain
	return
</code>