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appendix
A
Pin
1 2 3 4 5 6
CONNECTOR PIN ASSIGNMENTS
This appendix contains the pin assignments for all external connectors. Some of the connectors may not be used on the computer being serviced.
Enhanced Keyboard
Connector and Icon Signal
Data Unused Ground +5 VDC Clock Unused
6 4
KEY
5 3 2 1
Mouse
Connector and Icon Pin
1 2 3 4 5 6
Signal
Data Unused Ground +5 VDC Clock Unused
6 4
KEY
5 3 2 1
Ethernet BNC
Connector and Icon Pin
1 (Inside) 2 (Outside)
Signal
Data Ground
Compaq Deskpro EN Series of Personal Computers
A-1
Parallel Interface
Connector and Icon Pin
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18-25
Signal
Strobe Data Bit 0 Data Bit 1 Data Bit 2 Data Bit 3 Data Bit 4 Data Bit 5 Data Bit 6 Data Bit 7 Acknowledge Busy Paper End Select Auto Linefeed Error Initialize Printer Select IN Signal Ground
13 12 11 10
9
8
7
6
5
4
3
2
1
25 24 23 22 21 20 19 18 17 16 15 14
Serial Interface
Connector and Icon Pin
1 2 3 4 5 6 7 8 9
Signal
Carrier Detect Receive Data Transmit Data Data Terminal Ready Signal Ground Data Set Ready Request to Send Clear to Send Ring Indicator
1 6
2 7
3 8
4 9
5
Microphone Connector
Connector and Icon (1/8" miniphone) Pin
1 (Inside) 2 (Outside)
Signal
Data Ground
Headphone Connector
Connector and Icon (1/8" miniphone) Pin
1 (Inside) 2 (Outside)
Signal
Data Ground
A-2
Connector Pin Assignments
Compaq Deskpro EN Series of Personal Computers
A-3
Monitor
Connector Pin
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Signal
Red Analog Green Analog Blue Analog Monitor ID Bit2 Ground Ground Analog Ground Analog Ground Analog Not Connected Ground Monitor ID Bit 0 Bidirectional Data (SDA)* Horizontal Sync Vertical Sync Data Clock (SCL)*
4 3 2 1 10 9 8 7 6 15 14 13 12 11
5
* For DDC support (I2C monitors)
Ethernet AUI
Connector and Icon
8 15 7 14 6 13 5 12 4 11 3 10 2 9 1
Pin
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Signal
Ground Negative AUI Differential Collision Positive AUI Differential Collision Negative AUI Differential Transmit Positive AUI Differential Transmit Ground Ground Negative AUI Differential Receive Positive AUI Differential Receive +12V Ground Ground Not Used Not Used Not Used Not Used
A-4
Connector Pin Assignments
Ethernet RJ-45
Connector and Icon Pin
1 2 3 4 5 6 7 8
Signal
(+) Transmit Data (-) Transmit Data (+) Receive Data Unused Unused (-) Receive Data Unused Unused
1 3 5 7 2 4 6 8
USB Connector
Connector and Icon Pin
1 2 3 4
Signal
VCC - Data + Data Ground
1
2
3
4
External Infrared Transceiver
Connector and Icon Pin
1 2
8 5 2 7 4 1 6 3
Signal
Transmit Receive Ground 5V Mode Not Used Not Used Not used
3 4 5 6 7 8
Compaq Deskpro EN Series of Personal Computers
A-5
IDE/EIDE Drive Cable
39 40 1 2
Pin
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Signal
RESET GROUND DD7 DD8 DD6 DD9 DD5 DD10 DD4 DD11 DD3 DD12 DD2 DD13
Pin
15 16 17 18 19 20 21 22 23 24 25 26 27 28
Signal
DD1 DD14 DD0 DD15 GROUND (KEY) DMARQ GROUND DIOW Ground DIOR GROUND IORDY CSEL
Pin
29 30 31 32 33 34 35 36 37 38 39 40
Signal
DMAK GROUND INTRQ IOCS16 DA1 PDIAG (80-pin cable detect) DA0 DA2 CS1FX CS3FX DASP GROUND
A-6
Connector Pin Assignments
Slimline CD-ROM Adapter
Pin
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Signal
RESDRV_ GROUND DO7 D08 D06 D09 D05 D10 D04 D11 D03 D12 D02 D13 D01 D14 D00
Pin
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
Signal
D15 GROUND (KEY) DRQ GROUND IOW GROUND IOR GROUND IOCHRDY CABLE SELECT DAK GROUND IRQ IO16 A1 PDIAG
Pin
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Signal
A0 A2 CS1FX CS3FX DASP GROUND +5VMLOG +5VMOT GROUND AUDIO_L A_GROUND_R A_GROUND_L AUDIO_R FP01 FP02 FP03 FP04
Pin
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
Signal
FP05 FP06 FP07 FP08 FP09 FP10 FP11 FP12 FP13 FP14 FP15 FP16 FP17 FP18 FP19 FP20 FP21
Line-In Audio
Connector and Icon (1/8" miniphone) Pin
1 (inside 2 (outside)
Signal
Data Ground
Line-Out Audio
Connector and Icon (1/8" miniphone) Pin
1 (inside 2 (outside)
Signal
Data Ground
Compaq Deskpro EN Series of Personal Computers
A-7
AGP Connector
Pin
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Signal A
+12 V d dc Spare Reserved* USBGround INTA# RST# GNT# VCC3.3 ST1 Reserved PIPE# Ground Spare SBA1 VCC 3.3 SBA3 Reserved Ground SBA5 SBA7 Key
Signal B
Spare + 5V dc + 5V dc USB+ Ground INTB# CLK REQ# VCC3.3 ST0 ST2 RBF# Ground Spare SBA0 VCC 3.3 SBA2 SB_STB Ground SBA4 SBA6 Key
Pin
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
Signal A
Key Key Key AD30 AD28 VCC 3.3 AD26 AD24 Ground Reserved C/BE3# Vddq 3.3 AD22 AD20 Ground AD18 AD16 Vddq 3.3 FRAME# Spare Ground Spare
Signal B
Key Key Key AD31 AD29 VCC 3.3 AD27 AD25 Ground AD STB1 AD23 Vddq 3.3 AD21 AD19 Ground AD17 C/BE2# Vddq 3.3 IRDY# Spare Ground Spare
Pin
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 6
Signal A
VCC 3.3 TRDY# STOP# Spare Ground PAR AD15 Vddq 3.3 AD13 AD11 Ground AD9 C/BEO# Vddq 3.3 Reserved AD6 Ground AD4 AD2 Vddq 3.3 AD0 SMB1
Signal B
VCC 3.3 DEVSEL# Vddq 3.3 PERR# Ground SERR# C/BE1# Vddq 3.3 AD14 AD12 Ground AD10 AD8 Vddq 3.3 AD STB0 AD7 Ground AD5 AD3 Vddq 3.3 AD1 SMB0
A-8
Connector Pin Assignments
Ultra SCSI
Connector and Icon
Pin 1-11 12 13 14 15-25 26 27 28 29 30
Signal Ground Reserved Open Reserved Ground DB0 DB1 DB2 DB3 DB5
Pin 31 32 33 34 35 36 37 38 39 40
Signal DB5 DB6 DB7 DBP Ground Ground Reserved TERMPWR Reserved Ground
Pin 41 42 43 44 45 46 47 48 49 50
Signal ATN # Ground BSY # ACK # RST # MSG # SEL # C/D REQ # Input/Output
IDE CD-ROM Cable
49 50 1 2
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13
Signal RESDRV_ D06 D04 D02 D00 DREQ IOR DAK A1 CS1FX AUDIO_R +5VMOT1 +5VMLOG1
Pin 14 15 16 17 18 19 20 21 22 23 24 25 26
Signal GROUND D09 D11 D13 D15 GROUND GROUND GROUND PDIAG CS3FX AUDIO_L +5VMOT2 +5VMLOG2
Pin 27 28 29 30 31 32 33 34 35 36 37 38 39
Signal D07 D05 D03 D01 GROUND IOW OCHRDY IRQ A0 DASP A_GND_R +5VMOT3 DASP
Pin 40 41 42 43 44 45 46 47 48 48 49 50
Signal D08 D10 D12 D14 (KEY) GROUND CABLE SELECT IO16 A2 GROUND A_GND_L +5VMOT4
Compaq Deskpro EN Series of Personal Computers
A-9