IBM 1401 - Modifiers For Five-character Branch On Indicator (B) Instruction

Modifiers For Five-character Branch On Indicator (B) Instruction

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BCD Character Unit Meaning
Blank 1401 Unconditional—no word mark needed in next character
1 1009 in run condition
1011 punch in backspace operation
1011 reader parity indicator on
1231 auto select
1285 error
1412 control-check indicator on
1418 late read
1419 document to be read
1428 late read or late reading mode change
1445 printer error
7340 hypertape unusual end
7740 transmission complete with abnormal status
DDC transmission error
2 1009 buffer available
1011 punch ready
1011 reader ready
1231 full buffer
1285 end of line
1412 reader-not-ready signal on
1418 ready to engage
1419 document under read head (PDS 4)
1428 ready to engage
7340 hypertape normal end
7740 transmission complete successfully
DDC transmission ended by GMWM
3 1009 good transmission occurred
1011 punch not ready to receive data
1231 ready to read
1285 reader transporting
1412 read-check indicator on
1418 document under selected read station
1419 valid amount field
1428 document under selected read station
7340 hypertape control unit 7641 busy
7740 receive request
DDC read request
4 1009 reply-bad indicator on
1011 punch not ready to read
1231 empty hopper
1285 marked line
1412 amount-field indicator on
1419 valid process-control field
7340 hypertape attention
7740 7740 attention
DDC write request
5 1009 error reply acknowledgement
1011 punch overextended
1231 read error or overrun
1285 header information
1412 process-control indicator on
1418 document end
1419 valid account-number field
1428 document end
1445 printer busy
6 1009 program attention required
1011 punch supply reel low or chad box full
1231 timing mark check
1285 ready to read a line
1412 account-number indicator on
1418 character on line
1419 valid transit-number field
1428 character on line
1445 carriage busy
DDC write in progress
7 1009 end of message
1285 reader ready
1412 transit-number indicator on
1418 empty hopper and transport (end of file)
1419 valid serial-number field
1428 empty hopper and transport (end of file)
1445 carriage channel 9
DDC read in progress
8 1009 end of file
1285 end of file
1412 document-spacing-check indicator on
1418 ready to read
1419 auto-select
1428 ready to read
1448 carriage channel 12
DDC system A stopped
9 1403 carriage tape channel 9
0 1404 validity error
' or @ 1403 carriage tape channel 12
> 1448 end of block
/ 1401 unequal compare
S 1401 equal compare
T 1401 low compare
U 1401 high compare
V 1301 disk error
1311 disk error
1405 read or write parity check or read back check error
W 1301 wrong-length record
1311 wrong-length record
1405 wrong-length record
X 1301 uniqual-address compare
1311 uniqual-address compare
1405 uniqual-address compare
Y 1301 any disk-unit error condition
1311 any disk-unit error condition
1405 any disk-unit error condition
Z 1401 arithmetic overflow
‡ 1403 printer error (record mark)
( or % 1401 process check with process check switch off
1440 I/O check stop switch off
\ 1301 access busy
1311 access busy
J 1419 I/O channel-busy indicator
TAU tape busy
SIO serial input-output busy
K TAU end of reel (writing) or tape mark (reading)
L TAU tape error
N 1301 access inoperable
1311 access inoperable
1405 access inoperable
P 1403 printer busy
Q 1407 inquiry request
R 1403 carriage busy
! 1402 punch error
* 1407 inquiry clear
+ or & 1442 last card (Reader unit 2)
A 1402 last card if SS A is on
B 1401 SS B
7340 hypertape attention response
C 1401 SS C
D 1401 SS D
E 1401 SS E
7340 hypertape end response
F 1401 SS F
G 1401 SS G
H 1402 reader busy
I 1402 punch busy
? 1402 reader error
< 1448 early warning

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