IBM 2140, 2142 manual Power Cable Connector 3.3 V dc, Diskette

Power	Cable Connector
Pin		Signal	Name
1		Power	Good +5( V dc)
2		+5 V	dc
3		+12	V	dc
4		−12	V	dc
5		Ground
6		Ground

Pin Signal Name

7Ground

8Ground

9−5 V dc

10+5 V dc

11+5 V dc

12+5 V dc

Power Cable Connector 3.3 V dc

Pin Signal Name

13.3 V dc

23.3 V dc

33.3 V dc

Pin

4

5

6

Signal Name

Ground

Ground

Ground

Diskette	Cable		Connector
Pin	Signal	Name			I/O
1	Ground
2	Density Select				O
3	No	Connection
4	No	Connection
5	Ground
6	No	Connection
7	Ground
8	Index				I
9	Ground
10	Motor		Enable	0	O
11	Ground
12	Drive		Select	1	O
13	Ground
14	Drive		Select	0	O
15	Ground
16	Motor		Enable	1	O
17	Ground

Pin	Signal Name		I/O
18	Direction		O
19	Ground
20	Step		O
21	Ground
22	Write	Data	I
23	Ground
24	Write	Enable	O
25	Ground
26	Track	0	I
27	Ground
28	Write	Protect	I
29	Ground
30	Read	Data	I
31	Ground
32	Select	Head 1	O
33	Ground
34	Diskette Change		I

Note: The diskette drive signal cable for drive A has a twist for the Drive Select and Motor Enable signals.

Parts/Test Point Locations5-19