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External Disk Connector
Pin
2
3-7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
'1
•
Name
IRDY
•
11
IDKRD
GND
"
•
IMTRXD
ISEL2B
/DRESB
ICHNG
+5
ISIDEB
IWPRO
rrKO
IDKWE
IDKWD
ISTEPB
DIRB
ISEL3B
ISELIB
IINDEX
+
12
•
10
~
1
•
•
'I
•
x
~()
19
• •
•
7
IX
•
• •
()
)
17
•
•
~
I
f>
I
)
• •
Description
•
1
•
,
1.1
•
Disk
Ready-Active
Low
Disk Ready
Data-
Active Low
Ground
Disk Motor
Control-Active
Low
Select Drive
2-Active
Low
Disk
RESET-
Active Low
Disk has been Removed
from
Latched Low
5
VDC Supply
Drive-
Select
Disk
Side--O
=
Upper
I
=
Lower
Disk is Write Protected-Active Low
Drive Head Position
over
Track
O-Active
Low
Disk Write
Enable-Active
Low
Disk Write
Data-
Active
Low
Step the
Head- Pulse,
First Low then High
Select Head Direction--O
=
Inner I
=
Outer
Select Drive
3-Active
Low
Select Drive I-Active Low
Disk Index Pulse-Active Low
12 VDC Supply
Technical
Reference
A-
9
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