IBM System/370 Manual page 72

• Table 20.25.2.
3420, 2420, and 2401 Magnetic Tape Unit characteristics (continued)
r-
3420 Tape Units 2420 Ta 2401
Tape Un
it
s
Model
J
~haracteri
stic---, ___ M_od_€!l 3 M_od_e_l __
5 _ _ _
M_o_d_e_l_7-L ___ M_o_d_e_I __ 5 _ _ _ _ _ _ _
.....L. _ _
M_O_d_e_l_2 __ Model 3 Model 5
R.ecording
technique
NRZT
IBG size (ins.) .75
Translator Standard
Data Converter Standard
Dual Density
feature
(800/1600 BPI)
Optional
Data rate (KB) 60
at 800 BPI
Recording NRZI
technique at
800 BPI
IBG size at 800 .6
BPI (inches)
NRZI
.75
Standard
Standard
Optional
100
NRZI
.6
Control Unit 3803 Same as
Tape switching
Two-Channel
Switch
with Model 3
optional
Seve'n-Track
or Dual
Dens:ity
feat.ure
(not. both).
Read while
wri t.e ( RWW)
capability is:
not provided.
2
x 16 Same as
3 x 16 Model 3
4 x 16
(SWitching
features in
3803 control
units)
Optional Optional
NRZI
.75
Standard
Standard
Optional
160
NRZI
.6
Same as
Model 3
Same as
Model 3
Optional
NRZI NRZI
.75 .75
Standard Standard
Optional Optional
Not
available
Not Not Not
available available available
2803 Same as
Model 2. Model 5
2420 units
can be
mixed with
2401 Models
1 to 6 if
required
attach-
ments are
present
on 2803
2 x 16 Same as
3 x 16 Model 5
4 x 16
(Requires
one or two
2816 units)
Not Not
available available
2803, 2804 Same as
(RWW) Model Model 2
1 with
optional
Seven-
Track Com-
patibility
feature
2803, 2804
Model 2
with optional
Seven-Track,
Nine-Track,
or Seven-
and Nine-Track
compatibility
feature
Same as Same
2420 2420
as
Optional on Same as
2803 Model Model 2
1
for Model
67 and MP65
systems only
Optional Optional
60 90
NRZI NRZI
.6 .6
2803, 2804 Same as
(RWW) Model Model 5
2 with
optional
Seven-Track,
Nine-Track,
or Seven-
and. Nine-
Track Com-
patibility
feature
Same as
2420
Not
available
Same as
2420
Not
available