INPUT/OUTPUT CHANNELS:

     channel
	0	output		bit bucket channel

	1	input		normal input channel (macros & text)

	2	input/output	scratch channel

	3	output		default output channel

	4	output		second output channel (usually printer)

	5	input/output	console channel (for interactive use)

	6-9	not implemented   could be made additional scratch
				  and/or punch & reader devices


COMMAND LINE FORMAT:

	[<chan3>[,<chan4>]=]<chan1>[,<chan1>[,<chan1> ... ]]
				concatenation allowed on channel 1
	   [ ] optional items

	examples:
		STAGE2 ALXTEST.ASM,LST:=ALX.S2M,ALXTEST.ALX
		STAGE2 TERM.ASM,TERM.LST=ALX.S2M,TERM.ALX
		STAGE2 DEMO.S2M
		STAGE2 CH3,CH4=MEMORY.INP
		STAGE2 INTERACT.S2M


	CHANNEL		  1	  2	  3	  4	  5

	valid devices	disk	disk	disk	disk
			CON:		CON:	CON:	CON:
					LST:	LST:
					NUL:	NUL:

	default		error	disk	CON:	LST:	CON:


		channel 2 file name is fixed  STAGE2.CH2
		channel 5 is always the console

		additional device names accepted

			CON: = KBD: = TTY: = CRT:

			LST: = LPT:

	Note: Tabs are NOT expanded for the list device (sorry about that).