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1401
COMPATIBILITY
Special Features
The
1410
is not compatible with a
1401
program that makes use
of the following special features:
1.
Column Binary Feature
2.
Compressed Tape Feature
3. Punch Feed Read Feature
4.
The Serial 1/0 Adapter, including provisions for attaching
the following units:
a.
IBM
1009
Data Transmission Unit
b.
IBM
1011
Paper Tape Reader
c.
IBM
1012
Paper Tape Punch
d.
IBM
1412
Magnetic Character Reader
e.
IBM
1419
Magnetic Character Reader
Read and Write Tape Operations
(with word marks)
When writing tape in the load mode, if a word separator charac-
ter is encountered in core storage, the 1401 will write one word
separator on tape while the
1410
will write two word separator
characters on tape.
When reading tape in the load mode on the
1401,
any number
(one or more) of word separator characters read in succession
from tape are eliminated and a word mark is placed over the
first non-word separator character that follows the word sepa-
rator characters.
When reading tape in the load mode on the
1410,
a pair of ad-
jacient word separator characters on tape are read into core
storage as one word separator character and no word mark is
placed over the next non-word separator character.
When reading in
1401
Mode,
if
an IRG is encountered before a
GMWM is encountered, a GMWM i's inserted at that point.
Carriage Controls
A
1401
system will not execute an immediate skip to channel X
when the carriage is already at that channel, but a
1410
operating
in the
1401
mode will execute the instruction.
B-Address Register
At the completion of a card or print operation, the setting of the
B-address register will be different on the
1401
and a
1410
operating in the
1401
mode. The following chart shows a com-
parison of the B-address register contents at the completion of
the specific operation.
Operation
B-Add Reg
1401
081
2
*333
3
081
4
181
181
181
181
*
=
335
for an unbuffered printer
52
B-Add Reg
1410 (1401
Mode)
082
335
082
183
183
183
183
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