IBM System/370 145 Manual page 130

Table 20.25.2. 3420 and 2401 Magnetic Tape Unit characteristics (continued)
Characteristic
Data rate (KB)
800 BPI
556 BPI
200 BPI
IBG size
(inches)
Translator
Data Converter
Dual Density
feature
(800/1600 BPI)
Data rate
(KB)
at 800 BPI
Recording
technique at
800 BPI
Model "3
60
41.7
.75
Standard
Standard
Optional
60
NRZI
3420 Ta e Units
Model 5 Model 7
100
69.5
.75
standard
Standard
Optional
100
NRZI
160
111.2
.75
Standard
Standard
Optional
160
NRZI
IBG size at 800 .6
BPI (inches)
.6
.6
Control unit
Tape switching
Two-Channel
Switch
3803 Same as
with Model 3
optional
Seven Track
or Dual
Density
feature
(not both).
Read while
write (RW)
capability is
not provided
2 x 16 Same as
3
x
16 Model 3
4 x 16
(Switching
features in
3803)
Optional Optional
Same as
Model 3
Same as
Model 3
Optional
Modell
30
20.8
7.5
.75
Standard
Optional
Model 2
60
41.7
15
.75
Standard
Optional
2401 Ta e Units
Model 3 Model 4
90
62.5
22.5
.15
Standard
Optional
Model 5
Not
available
Not Not Optional Optional
available available
2803. 2804 Same as
(RW) Model Model 1
1 with
optional
Seven-Track
compatibil-
ity feature.
2803. 2804
Model 2 with
optional
Seven-Track.
Nine-Track, -
or Seven-
and Nine-
Track
Compatibil-
ity feature.
2 x 16 Same as
3
x
16 Model 1
4 x 16
(Requires
one or two
2816 units)
Optional Same as
on 2803 Model 1
Model 1 for
Models 67 and
MP65 systems
only.
Same as
Model 1
Same as
Model 1
Same as
Model 1
30
60
NRZI NRZI
.6 .6
2803, 2804 Same as
(RW) Model Model
4
2 with
optional
Seven-Track,
Nine-Track,
or Seven-
and Nine-
Track
Compatibil-
ity feature.
Same as Same as
Model 1 Model 1
Not Not
Available Available
Model 6
Optional
90
NRZI
.6
Same as
Model
4
Same as
Model 1
Not
Available