IBM 5150 Hardware Reference Manual page 128

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5-1/4" Diskette Drive Adapter
External Interface Specifications
REAR PANEL
37 PIN '0' SHELL
CONNECTOR
o
1 •
• 20 •
•
• •
•
•
•
•
• •
• •
• • 37
o
AT STANDARD TTL LEVELS
Pin no.
Unused 1 ·5
Index
6
..
..
I...
Motor Enable C
7
1""1"
I...
Drive Select 0
8
....
...
Drive Select C
9
I""'"
Motor Enable 0
10
-
.....
I...
Direction (Stepper Motod 11
5%" Diskette
External
.....
...
Step Pulse
12 Drive
Drives
....
Adapter
...
Select Head 1 13
~
...
Write Enable 14 ...
Track 0 15
..
. .
Write Protect
16
. .
..
Read Data 17
. .
-
Write Data
18
~-..
.... ­
Ground 20·37
2-109