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Service Hints & Tips

Document ID: GSMH-3CGJLV

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IBM ValuePoint - System board connector assignments

Applicable to: World-Wide

System Board Connector Assignments:
Display/Signal:

Pin	Signal Name	I/O
1	Red Video	O
2	Green Video	O
3	Blue Video	O
4	Monitor ID Bit 2	I
5	Sync Ground
6	Red Ground
7	Green Ground
8	Blue Ground
9	No Connection
10	Sync Ground
11	Monitor ID Bit 0	I
12	Monitor ID Bit 1	I
13	Horizontal Sync	O
14	Vertical Sync	O
15	Monitor ID Bit 3	I

Power:

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
7	Ground
8	Ground
9	- 5 V dc
10	+ 5 V dc
11	+ 5 V dc
12	+ 5 V dc

Parallel Port:

Pin	Signal Name	I/O
1	Strobe	O
2	Data Bit 0	I/O
3	Data Bit 1	I/O
4	Data Bit 2	I/O
5	Data Bit 3	I/O
6	Data Bit 4	I/O
7	Data Bit 5	I/O
8	Data Bit 6	I/O
9	Data Bit 7	I/O
10	Acknowledge	I
11	Busy	I
12	Paper Empty	I
13	Select	O
14	Auto Feed	NA
15	Error	I
16	Initialize	O
17	Select (In)	O
18	Ground Power
19	Ground Power
20	Ground Power
21	Ground Power
22	Ground Power
23	Ground Power
24	Ground Power
25	Ground Power

Serial Port:

Pin	Signal Name	I/O
1	Data Carrier Detect	I
2	Receive Data	I
3	Transmit Data	O
4	Data Terminal Ready	O
5	Signal Ground
6	Data Set Ready	I
7	Request To Send	O
8	Clear To Send	I
9	Ring Indicator	I

Mouse:

Pin	Signal Name	I/O
1	Data	I/O
2	No Connection
3	Ground	Power
4	+ 5 V dc	Power
5	Clock	I/O
6	No Connection

Keyboard:

Pin	Signal Name	I/O
1	Data	I/O
2	No Connection
3	Ground Power
4	+ 5 V dc Power
5	Clock	I/O
6	No Connection

Diskette:

Pin	Signal Name	I/O
1	Drive	2
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
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.

Hard Disk:

Pin	Signal Name	I/O
1	Host Reset	O
2	Ground
3	Host Data 7	I/O
4	Host Data 8	I/O
5	Host Data 6	I/O
6	Host Data 9	I/O
7	Host Data 5	I/O
8	Host Data 10	I/O
9	Host Data 4	I/O
10	Host Data 11	I/O
11	Host Data 3	I/O
12	Host Data 12	I/O
13	Host Data 2	I/O
14	Host Data 13	I/O
15	Host Data 1	I/O
16	Host Data 14	I/O
17	Host Data 0	I/O
18	Host Data 15	I/O
19	Ground Power
20	No Connection
21	No Connection
22	Ground
23	Host IOW	O
24	Ground Power
25	Host IOR	O
26	Ground Power
27	No Connection
28	Host ALE	O
29	No Connection
30	Ground Power
31	Host IRQ	I
32	Host IOCS 16	O
33	Host A1	O
34	No Connection
35	Host A0	O
36	Host A2	O
37	Host CS0	O
38	Host CS1	O
39	Host Active	O
40	Ground Power

Figure 14. Hard Disk

AT Bus Riser Connector:

Pin	Signal Name	I/O
1	+ 12 V dc
2	+ 5 V dc
3	Ground
4	Ground
5	Reset Drv	O
6	+ 5 V dc
7	IRQ 9	I
8	- 5 V dc
9	DRQ2	I
10	- 12 V dc
11	OWS
12	+ 12 V dc
13	Ground
14	SMEMW	O
15	SMEMR	O
16	IOW	I/O
17	IOR	I/O
18	DACK 3	O
19	DRQ 3	I
20	DACK 1	O
21	DRQ 1	I
22	Refresh	I/O
23	Computer Clock	O
24	IRQ 7	I
25	IRQ 6	I
26	IRQ 5	I
27	IRQ 4	I
28	IRQ 3	I
29	DACK 2	O
30	T/C	O
31	BALE	O
32	+ 5 V dc
33	OSC	I
34	Ground
35	Ground
36	+ 5 V dc
37	+ 5 V dc
38	MEMCS 16	I
39	IOCS 16	I
40	IRQ 10	I
41	IRQ 11	I
42	Power Good	I
43	IRQ 15	I
44	IRQ 14	I
45	DACK 0	O
46	DRQ 0	I
47	DACK 5	O
48	DRQ 5	I
49	DACK 6	O
50	DRQ 6	I
51	DACK 7	O
52	DRQ 7	I
53	+ 5 V dc
54	MASTER	I
55	Ground
56	Ground
57	Ground
58	+ 5 V dc
59	+ 5 V dc
60	+ 5 V dc
61	+ 12 V dc
62	Ground
63	Ground
64	I/O Check	I
65	SD 7	I/O
66	SD 6	I/O
67	SD 5	I/O
68	SD 4	I/O
69	SD 3	I/O
70	SD 2	I/O
71	SD 1	I/O
72	SD 0	I/O
73	I/O CH Ready	I
74	AEN	O
75	SA 19	O
76	SA 18	O
77	SA 17	O
78	SA 16	O
79	SA 15	O
80	SA 14	O
81	SA 13	O
82	SA 12	O
83	SA 11	O
84	SA 10	O
85	SA 9	O
86	SA 8	O
87	SA 7	O
88	SA 6	O
89	SA 5	O
90	SA 4	O
91	SA 3	O
92	SA 2	O
93	SA 1	O
94	SA 0	O
95	Ground
96	Ground
97	+ 5 V dc
98	SBHE	I/O
99	LA23	I/O
100	LA22	I/O
101	LA21	I/O
102	LA20	I/O
103	LA19	I/O
104	LA18	I/O
105	LA17	I/O
106	MEMR	I/O
107	MEMW	I/O
108	SD 8	I/O
109	SD 9	I/O
110	SD 10	I/O
111	SD 11	I/O
112	SD 12	I/O
113	SD 13	I/O
114	SD 14	I/O
115	SD 15	I/O
116	Ground
117	Ground
118	Ground
119	+ 5 V dc
120	+ 5 V dc

AT Bus Riser Connector (Extension):

Pin	Signal Name	I/O
1A	DAT01	I/O
2A	DAT03	I/O
3A	Ground
4A	DAT05	I/O
5A	DAT07	I/O
6A	DAT09	I/O
7A	DAT11	I/O
8A	DAT13	I/O
9A	DAT15	I/O
10A	Ground
11A	DAT17	I/O
12A	+ 5 V dc	I/O
13A	DAT19	I/O
14A	DAT21	I/O
15A	DAT23	I/O
16A	DAT25	I/O
17A	Ground
18A	DAT27	I/O
19A	DAT29	I/O
20A	DAT31	I/O
21A	ADR30	I/O
22A	ADR28	I/O
23A	ADR26	I/O
24A	Ground
25A	ADR24	I/O
26A	ADR22	I/O
27A	+ 5 V dc	I/O
28A	ADR20	I/O
29A	ADR18	I/O
30A	ADR16	I/O
31A	ADR14	I/O
32A	ADR12	I/O
33A	ADR10	I/O
34A	ADR08	I/O
35A	Ground
36A	ADR06	I/O
37A	ADR04	I/O
38A	WBACK	O
39A	BE0	I/O
40A	+ 5 V dc	I/O
41A	BE1	I/O
42A	BE2	I/O
43A	Ground
44A	BE3	I/O
45A	ADS	I/O
46A	Not Used	I/O
47A	Not Used	I/O
48A	LRDY	I
49A	LDEV	I
50A	LREQ	I
51A	Ground
52A	LGNT	O
53A	+ 5 V dc	I/O
54A	ID2	O
55A	ID3	O
56A	ID4	O
57A	LKEN	O
58A	LEADS	I/O
1B	DAT00	I/O
2B	DAT02	I/O
3B	DAT04	I/O
4B	DAT06	I/O
5B	DAT08	I/O
6B	Ground
7B	DAT10	I/O
8B	DAT12	I/O
9B	+ 5 V dc	I/O
10B	DAT14	I/O
11B	DAT16	I/O
12B	DAT18	I/O
13B	DAT20	I/O
14B	Ground
15B	DAT22	I/O
16B	DAT24	I/O
17B	DAT26	I/O
18B	DAT28	I/O
19B	DAT30	I/O
20B	+ 5 V dc	I/O
21B	ADR31	I/O
22B	Ground
23B	ADR29	I/O
24B	ADR27	I/O
25B	ADR25	I/O
26B	ADR23	I/O
27B	ADR21	I/O
28B	ADR19	I/O
29B	Ground
30B	ADR17	I/O
31B	ADR15	I/O
32B	+ 5 V dc	I/O
33B	ADR13	I/O
34B	ADR11	I/O
35B	ADR09	I/O
36B	ADR07	I/O
37B	ADR05	I/O
38B	Ground
39B	ADR03	I/O
40B	ADR02	I/O
41B	(not used)	I/O
42B	RESET	O
43B	D/C	I/O
44B	M/IO	I/O
45B	W/R	I/O
46B	Not Used	I/O
47B	Not Used	I/O
48B	RDYRTN	O
49B	Ground
50B	IRQ9	I
51B	BRDY	I/O
52B	BLAST	I/O
53B	ID0	O
54B	ID1	O
55B	Ground
56B	LCLK	O
57B	+ 5 V dc	I/O
58B	LBS16	I/O

Video Feature:

Pin	Signal Name	I/O
1	Pixel Data 0	I
2	Ground
3	Pixel Data 1	I
4	Ground
5	Pixel Data 2	I
6	Ground
7	Pixel Data 3	I
8	Enable Ext Pixel Data	O
9	Pixel Data 4	I
10	Enable Ext Sync	O
11	Pixel Data 5	I
12	Enable Ext Pixel Clock	O
13	Pixel Data 6	I
14	No Connection
15	Pixel Data 7	I
16	Ground
17	Pixel Clock	I/O
18	Ground
19	Blanking
20	Ground
21	Horizontal Sync
22	Ground
23	Vertical Sync
24	No Connection
25	Ground
26	No Connection

Video Feature (486SX):

Pin	Signal Name	I/O
1	Ground	I
2	Pixel Data	0
3	Ground	I
4	Pixel Data	2
5	Pixel Data 1	I
6	Pixel Data 3
7	Ground	I
8	Pixel Data 4	O
9	Enable Ext Sync	I
10	Enable Ext Pixel Data	O
11	Enable Ext Pixel Clock	I
12	Pixel Data 5	O
13	No Connection	I
14	Pixel Data	6
15	Ground	I
16	Pixel Data 7
17	Ground	I/O
18	Pixel Clock
19	Ground
20	Blanking
21	Ground
22	Horizontal Sync
23	No Connection
24	Vertical Sync
25	No Connection
26	Ground

Memory Module-30 Pin:

Pin	Signal Name	I/O
1	+ 5 V dc	I
2	CAS	O
3	D0	I/O
4	A0	O
5	A1	O
6	D1	I/O
7	A2	O
8	A3	O
9	Ground
10	D2	I/O
11	A4	O
12	A5	O
13	D3	I/O
14	A6	O
15	A7	O
16	D4	I/O
17	A8	O
18	A9	O
19	A10	O
20	D5	I/O
21	WE	O
22	Ground
23	D6	I/O
24	No Connection
25	D7	I/O
26	DP Out	I
27	RAS	O
28	CASP	O
29	DP In	O
30	+ 5 V dc	I

Memory Module - 72 Pin:

Pin	Signal Name	I/O
1	Ground
2	SIMMD0	I/O
3	SIMMD0	I/O
4	SIMMD1	I/O
5	SIMMD1	I/O
6	SIMMD2	I/O
7	SIMMD2	I/O
8	SIMMD3	I/O
9	SIMMD3	I/O
10	+ 5 V dc	I
11	CASP	I
12	MA0	I
13	MA1	I
14	MA2	I
15	MA3	I
16	MA4	I
17	MA5	I
18	MA6	I
19	MA10	I
20	SIMMD4	I/O
21	SIMMD4	I/O
22	SIMMD5	I/O
23	SIMMD5	I/O
24	SIMMD6	I/O
25	SIMMD6	I/O
26	SIMMD7	I/O
27	SIMMD7	I/O
28	MA7	I
29	BS0	I
30	+ 5 V dc	I
31	MA8	I
32	MA9	I
33	RAS5	I
34	RAS4	I
35	DP0	I
36	DP0	I
37	DP1	I
38	DP1	I
39	Ground	I
40	BCAS0	I
41	BCAS2	I
42	BCAS3	I
43	BCAS1	I
44	RAS4	I
45	RAS5	I
46	BS1	I
47	AWE	I
48	Open
49	SIMMD8	I/O
50	SIMMD8	I/O
51	SIMMD9	I/O
52	SIMMD9	I/O
53	SIMMD10	I/O
54	SIMMD10	I/O
55	SIMMD11	I/O
56	SIMMD11	I/O
57	SIMMD12	I/O
58	SIMMD12	I/O
59	+ 5 V dcI
60	SIMMD13	I/O
61	SIMMD13	I/O
62	SIMMD14	I/O
63	SIMMD14	I/O
64	SIMMD15	I/O
65	SIMMD15	I/O
66	BS2	I
67	PD1	O
68	PD2	O
69	PD3	O
70	PD4	I
71	BS3	I
72	Ground

	Search Keywords
	Hint Category	Hardware Maintenance Information
	Date Created	18-12-96
	Last Updated	08-05-98
	Revision Date	30-04-99
	Brand	IBM PC
	Product Family	ValuePoint
	Machine Type	6381, 6382, 6384, 6387
	Model	all
	TypeModel
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