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Input Lines (From Tape Control)
dc Voltage
Rise or Fall Time
Pulse Width
Level
Line Name
(Maximum)
(Minimum)
UP DOWN
Select
0.25 usec
NS*
+2.5 +1.0
Backward
0.25 usec
9.5 usec
+2.5 +1.0
Go
0.25 usec
NS
+2.5 +1.0
Set Read Status
0.25 usec
10.5 usec
-#2.5 +1.0
Set Write Status
0.25 usec
7.9 usec
+2.5 +1.0
Rewind
NS*
NS*
+2.5 +1.0
Rewind-Unload
NS*
NS*
+2.5 +1.0
Metering Out
NS*
NS*
+2.5 +1.0
Write Bus
NS*
NS*
+0.6 +0.3
Command
Response
Rewind
Not Ready or Select & at LP
Rewind-Unload
Not Ready
Backward
Backward Status
Set Read Status
Select and Read Status
Set Write Status
(Not) Select and Read Status
*NS-not specified
Output Lines (To Tape Control)
Maximum
dc Voltage
Rise or Fall Time
Response Time
Level
Line Name
(Maximum)
(from Select)
UP
DOWN
Model 1, 2, 3
1 usec
2.0 usec
+2.5 +1.5
Select
&
T I Off
1 usec
6.8 usec
+2.5 +1.5
Select
&
at LP
1 usec
6.2 usec
+2.5 +1.5
Select
&
Read Status
1 usec
6.2 usec
+2.5 +1.5
Select
&
NS*
6.2 usec
+2.5 +1.5
Not File Protect
Backward
NS*
6.2 usec
+2.5 +1.5
Write Inhibit
See Note
See Note
+2.5 +1.5
Not Ready
NS*
NS*
+1.9 +1.0
Read Bus
NS*
NS*
0.1 vp/p@
180KC
Note: Determined by interblock gap (IBG) length
and the time necessary to reach full tape speed.
*NS- not specified
Figure 2. Interface Lines: Specifications
4
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