Function Name: JSRFAR

Purpose: Gosub in another bank
Call address: $FF6E (hex) 65390 (decimal)

	Registers:	none
	Memory:		system map, also:
			$02 -> bank (0-15)
			$03 -> PC high
			$04 -> PC low
			$05 -> .S (status
			$06 -> .A
			$07 -> .X
			$08 -> .Y
	Flags:		none
	Calls:		none
	Registers:	none
	Memory:		as per call, also:
			$05 -> .S (status)
			$06 -> .A
			$07 -> .X
			$08 -> .Y
	Flags:		none

Description: The routine JSRFAR, enable code executing in the system bank of memory to call a routine in any other bank. In the case of JSRFAR, a return will be made to the caller's bank. It should be noted that JSRFAR calls JMPFAR, which calls GETCFG. When calling a non-system bank, the user should take necessary precautions to ensure that interrupts (IRQ's and NMI's) will be handled properly (or disabled beforehand). Both JSRFAR and JMPFAR are RAM-based routines located in common (shared) RAM at $2CD and $2E3 respectively.
The following code illustrates how to call a subroutine in the second RAM bank from the system bank. Note that we need not worry about IRQ's and NMI's in this case because the system will handle them properly in any configuration that has the Kernal ROM or any valid RAM bank in context at the top page of memory.


	STY	$08	;assumes registers and status
	STX	$07	;already setup for call
	STA	$06
	STA	$05
	LDA	#1	;want to call $2000 in bank 1
	LDY	#$20
	LDX	#$00
	STA	$02
	STY	$03
	STX	$04


	LDA	$05	;restore status and registers
	LDA	$06
	LDX	$07
	LDY	$08