IBM System/370 145 Manual page 153

Table 20.30.3. 3505 reader, 3525 punch, and 2540 reader/punch feature comparison
Feature
Type of unit
systems to which units
attach
Models and speeds
Card reading
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card feed retry
after misfeed
Read or punch checking
Automatic punch retry
after error
File feed capacity
Stackers
3505 Card Reader
Card reader and fully
buffered control unit
combined. Attaches to
any Ghannel. Operates
independently of 3525,
if the latter is
attachede
All System/370 models
and Systeml360
Model 195
B1 - 800-cpm read
B2 - 1200-cpm read
(combines with any
3525 model>
optical - serial by
column
~r~c~~on feeding with
vacuum-assist.
Yes" up to three times
Each column read four
times. Impulses
checked for valid
data or no-data
indications.
3000 cards
One 3500-card-capacity
logical stacker is
standard (automatic
alternate stacking
in two 1750-card
stackers). One
additional 1750-
card-capacity stacker
is optional.
2540 Card Read Punch
(read features)
Combined reader and
punch unit. Requires
2821 control unit for
attachment to any
channel. Read and punch
operations are indepen-
dent and fully buffered.
All System/370 models
and System/360 Models
22 and up
1000-cpm read
(one model only)
Eighty read brushes
parallel by row
Picker XU1ves and mUlti-
toothed clutch
No
Cards are read at two
successive stations and
hole counts are
compared.
3100 cards
Two 1350-card-capacity
dedicated read stackers
are standard. Third
1350-card-capacity
stacker is also standard
and can
be
used
by
either read or punch
side.
3525 Card Punch 2540 Card Read Punch
(punch features)
Card punch unit See read features column.
attaches to channel
via 3505. Additional
control added to 3505
provides fully buffered
operations independent
from those of the
reader.
Same as 3505
P1 - 100-cpm punch
P2 - 200-cpm punch
P3 - 300-cpm punch
(combines with any
3505 model)
Card Read option
required. Optical
reading, parallel
by row.
Picker knives and
multi toothed clutch
No
Punch checking done
at punch station.
Data from sensors
attached to punches
compared with data
sent to
be
punched.
Prepunched cards
should not
be
used
unless Card Read
feature is present.
Standard hardware
feature (for' punch-
only and punch/print
operations).
1200 cards
TWo 1200-card-
capacity stackers
standard.
Same as read features column
300-cpm punch
(one model only)
Punch Feed Read optional
feature required. Read
brushes for parallel
reading by row.
Picker knives and multi-
toothed clutch
No
Punch checking done at 80-
brush read station after
punch station, as for read
checking,. Prepunched cards
cannot
be
used unless
Punch Feed Read feature is
present.
Not provided by hardware.
(Offered as an option by
OS and OOS data management.)
1350 cards
Two
1350-card-capacity
dedicated punch stackers
are standard. Third 1350-
card-capacity stacker is
also standard and can be
used by either punch or
read side.