Dataproducts M/50 Parallel

Pin	Return	Dir	Description	Active State
CC	EE		Ready	High
Y	AA		On Line	High
E	C		Demand	High
j	m		Data Strobe	High
B	D		Data 1	n/a
F	J		Data 2	n/a
L	N		Data 3	n/a
R	T		Data 4	n/a
V	X		Data 5	n/a
Z	b		Data 6	n/a
n	k		Data 7	n/a
u	w		Data 8	n/a
z	BB		Parity	n/a
d	f		Ident 0	n/a
a	c		Ident 1	n/a
v	x		Interface Verify	Low
HH	K		+5 VDC (Test)	High
r	t		Parity Error	High
M	P		Bottom of Form	High
S	U		Top of Form	High
p	s		Paper Instruction	High
A	H		Buffer Clear	High
W	Y		Paper Moving	High
FF	DD		Paper Moving	High
e	h		Not VFU	High

Note: Direction is Host (Computer) relative Peripheral (Printer).
Note: Return is Ground signal for Unbalanced and the Negative Signal for Balanced.