Compaq 4000N User Manual
Page 99
Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
5-9
The 50-pin connector is intended for a CD-ROM drive that operates as a slave on the secondary
IDE interface. This interface includes power and audio signals. The 50-pin connector is
illustrated below followed by the pinout.
Figure 5–1. 50-Pin IDE Connector.
Table 5–6. 40-Pin IDE Connector Pinout
Table 5-5.
50-Pin IDE Connector Pinout
Pin
Signal
Description
Pin
Signal
Description
1
RESDRV-
Reset
26
GND
Ground
2
GND
Ground
27
CHRDY
I/O Channel Ready
3
SHD07
Data Bit <7>
28
ALE
Cable Select [1]
4
SHD08
Data Bit <8>
29
DAK-
DMA Acknowledge
5
SHD06
Data Bit <6>
30
GND
Ground
6
SHD09
Data Bit <9>
31
IRQ
Interrupt Request [1]
7
SHD05
Data Bit <5>
32
IO16-
16-bit I/O
8
SHD10
Data Bit <10>
33
A1
Address 1
9
SHD04
Data Bit <4>
34
PDIAG-
Pass Diagnostics
10
SHD11
Data Bit <11>
35
A0
Address 0
11
SHD03
Data Bit <3>
36
A2
Address 2
12
SHD12
Data Bit <12>
37
CS1FX-
Chip Select
13
SHD02
Data Bit <2>
38
CS3FX-
Chip Select
14
SHD13
Data Bit <13>
39
DASF-
Drive Active
15
SHD01
Data Bit <1>
40
GND
Ground
16
SHD14
Data Bit <14>
41
AUD L
Left Channel Audio
17
SHD00
Data Bit <0>
42
AUD R
Right Channel Audio
18
SHD15
Data Bit <15>
43
AUD R RTN
Right Channel Audio Return
19
GND
Ground
44
AUD L RTN
Left Channel Audio Return
20
--
(Key Space)
45
+5 VDC
Motor Power
21
DRQ
DMA Request
46
+5 VDC
Motor Power
22
GND
Ground
47
+5 VDC
Motor Power
23
IOW-
I/O Write
48
+5 VDC
Motor Power
24
GND
Ground
49
+5 VDC
Log Power
25
IOR-
I/O Read
50
+5 VDC
Log Power
NOTES:
[1] Pin is left floating to make CD-ROM always slave.
P1
P49
P50
P2