IBM 2025 Maintenance Manual page 37

Sequence of Operation for Combination Operations Is Print, Read, and Punch
1400
Operation
Read(!)
Starts as 21, and during read ending routine (LRDR) is changed to 20. In case of error
(and the 1/0 Stop switch is on,) the code remains 21 and display stop occurs.
Print(£)
Starts as 22 and is reset to 00 at the end of the normal print routine (MPRT)
before return to LOPD and ICYC.
Print, Read
(;i)
Starts as 23 and is changed to 21 at end of the print routine. Routine branches back
to ICYC VALADR 0, is decoded as a 1 Op and executed.
Punch(~
Starts as 24 and is changed to 20 during punch ending routine (LPCH).
Punch Col Bin (4C) In case of error, code remains 24 and a display stop occurs.
Read, Punch (§.)
Starts as 25 and is changed to 24 at read ending (LRDR). In case of error (with 1/0
Stop switch on) code remains 25 and display stop occurs. No error routine branches
back to LOPD, performs punch op and is changed to 20.
Print, Punch (§) Starts as 26 and is changed to 24 at end of Print routine. Routine branches back to
ICYC VALADR 0 and is decoded as a punch op. Operation is then the same as a
4 op and is changed to 20 at the ending.
Print, Read,
Starts as 27, changes to 25 at end of print operation. 25 causes a read op, at end of
Punch
(1) read op code changes to 24 and causes a punch op. At end of punch op, code
changes to 20. All error limitations for the various operations apply.
Punch Feed Starts as 24. The d-modifier causes the op code to change to A4, then a normal
Read (iR) punch routine is started. At the end of the punch routine the code is changed to
28 and a punch feed read operation is performed. At end op code changes to 20.
Read Column
Starts as 21. Changes to 20 during read ending routine (RDREND). Error handling
Binary (lC) same as for Read op. (Validity not checked.)
Figure 1-28. Op-Code Information (1400 Compatibility)
WITH WORDMARK NO WORDMARK WITH WORDMARK
NO WORDMARK
4567 0123___..
+
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
0000
Blank & Blank &
--
?
I
*
0 ? I
:j:
0
0001
I I
A
J 1
A
J
1
0010 B
K
s
2 B
K
s
2
0011
c
L T 3
c
L
T
3
0100 D M
u
4 D M
u
4
0101 E N
v
5 E N
v
5
0110 F 0
w
6
F
0
w
6
0111 G
p x
7 G
p x
7
1000 H Q
y
8
H
Q
y
8
1001 I
R
z
9
I
R
z
9
1010
1)
{>
1011
$
#
$
#
1100 J:I *
%
@ J:I *
% @
1101
[ J
v
:
~
]_
v
:
1110
<
;
\
>
<
;
\
>
1111 * /::,. #t
~
t
/::,.
ti+- ~
Figure 1-29. 1400 Defined Characters
2025 FEMM (7/69) 1-27