need/want support for 
	36 bit (PDP-6, PDP-10)
	18 bit (TX-0, PDP-1, PDP-4/7/..)
	16 bit (Whirlwind, MTC)
	12 bit (PDP-5/8)

(PiDP-8 has 26 switches)

Whirlwind:
 switches:
	5 FF reset switches (+ reset enable) (17 bit)
	27 TSS switches (16 bit)
	CS reset (5 bits + PB?)
	SS reset (11 bits + PB?)
	TPD reset (3 bits + PB?)
	PC reset (+ reset enable) (12 bit)
	CR reset (?)
	COR reset (?)
	misc (several)
 buttons:
	some resets?
	manual clock
	start over
	...
 lights:
	PC (11 bit)
	PR/PAR (16 bit)
	AR (16 bit) (x2, partial sum + carry)
	BR (16 bit)
	AC (16 bit)
	SC (6 bit)
	CR (16 bit)
	IOR (16 bit)
	COR (16 bit) ?

TX-0:
 switches
	16 TSS switches (+ CM LR) (20 bit)
	TAC (18 bit)
	TBR (18 bit)
	control stuff (11)
 lights:
	MAR (16 bit)
	PC (16 bit)
	MBR (18 bit)
	AC (18 bit)
	LR (18 bit)
	status (21)

PDP-1:
 switches:
	TA (~18 bit)
	TW (18 bit)
	control + sense (9)
 buttons:
	at least 6 (some two way?)
 lights:
	PC (12 bit)
	IR (5 bit)
	MA (12 bit)
	MB (18 bit)
	AC (18 bit)
	IO (18 bit)
	cycle (12)
	misc (21)

PDP-6 (PDP-10 similar):
 switches:
	data (36 bit)
	address (18 bit)
	misc (4)
 buttons:
	2x8 (some latching, maybe press longer to latch?)
 lights:
	IR (18 bit)
	MI (36 bit)
	PC (18 bit)
	MA (18 bit)
	PI (3x 7 bit)
	misc (7 bit)
	optional:
	8x14 FF indicators
	3x36 bit for MB,AR,MQ

Proposal:
 switches:
	3x 18 rows for register input
	18 (?) switches for control and setting multiplexing
 buttons:
	18 for various things
 lights:
	6x 18 rows for registers and misc stuff