;acptr() - Get data from the serial bus
;Returns: A = Received Character
;Preparatory routines: TALK, TKSA
;Error returns: See READST
;Stack requirements: 13
;Registers affected: A, X
ACPTR  = $FFA5     ;Alias to ACPTR Routine  

;chkin(lfn) - Open a channel for input
;Arguments: A = Logical File Number
;    Preparatory routines: (OPEN)
;    Error returns:
;    Stack requirements: None
;    Registers affected: A, X
CHKIN:  TAX        ;Transfer Channel# to Accumulator
		JMP $FFC6  ;Execute CHKIN Routine
		
;chkout(lfn) - Open a channel for output
;Arguments: A = Logical File Number
;    Preparatory routines: (OPEN)
;    Error returns: 0,3,5,7 (See READST)
;    Stack requirements: 4+
;    Registers affected: A, X
CHKOUT: TAX        ;Transfer Channel# to Accumulator
		JMP $FFC9  ;Execute CHKOU7T Routine

;chrin() - Get a character from the input channel
;Returns: A = Byte Received
;    Preparatory routines: (OPEN, CHKIN)
;    Error returns: 0 (See READST)
;    Stack requirements: 7+
;    Registers affected: A, X
CHRIN   = $FFCF     ;Alias to CHRIN Routine  

;chrout(chr) - Output a character
;Arguments: A = Character to Send
;    Preparatory routines: (CHKOUT,OPEN)
;    Error returns: 0 (See READST)
;    Stack requirements: 8+
;    Registers affected: A
CHRIN   = $FFD2     ;Alias to CHROUT Routine