Connector Pin Assignments A-9
DISKETTE DRIVE INTERFACE PIN ASSIGNMENTS
Table A-9 provides the pin assignments for the diskette drive interface.
A-9 Diskette Drive Connector Pin Assignments
Ground Pin
Signal Pin
I/O
Signal Name
1
2
O
FDHDIN
3
4
Not used
5*
6
FDEDIN
7
8
INDEX
9
10
MOTEN1
11
12
O
DS2
13
14
O
DS1
15
16
O
MOTEN2
17
18
O
DIR
19
20
O
STEP
21
22
O
WRT DATA
23
24
O
WRT EN GATE
25
26
I
TRK0
27
28
I
WRT PROT
29
30
I
READ DATA
31
32
O
HS SEL
33
34
I
DSKT CHG
*Pin 5 is reserved for connector polarization.
IDE INTERFACE CONNECTORS
All signal levels in the IDE interface are TTL compatible. A logic 1 is a signal whose
voltage level is between 2.0 and 5.0 V. A logic 0 is a signal measuring between 0.00 V and
0.70 V.
The two system board IDE connectors are physically identical. Electrically the primary
IDE/PCI bus IDE connector is faster and the secondary IDE/PCI connector is slower. Table
A-10 provides the IDE pin assignments. All signals on the Host interface have the prefix
HOST. All negatively active signals are further prefixed with a “-” designation. All
positively active signals are prefixed with a “+” designation.
