1/4" Diskette Drive Adapter Internal Interface Specifications; Specifications - IBM 5150 Hardware Reference Manual

5-1/4" Diskette Drive Adapter
Internal Interface Specifications
34 PIN KEYED
EDGE CONNECTOR
NOTE: LANDS 1-33 ARE ON THE BACKSIDE
OF THE BOARD, LANDS 2-34 ARE ON THE
FRONT, OR COMPONENT SIDE.
COMPONENT
SIDE
AT STANDARD TTL LEVELS
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"' "
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IBM 5 1/4"
"' "
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Diskette
"' "
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Drives
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"' "
Ground-Odd Numbers
Unused
Index
Motor Enable A
Drive Select B
Drive Select A
Motor Enable B
Direction (Stepper Motor!
18
Step Pulse
Write Data
Write Enable
Track 0
Write Protect
Read Data
Select Head 1
Unused
Land No.
1-33
2,4,6
8
---..
...
10
12
14
16 5 1/4" Diskett
e
Drive
Adapter
20
22
24
26
. .
...
28
... . .
30
...
...
32
34
2-108