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Op
OCode
Operand 1
Code
DA
M
N
0
7 8
11 12
13
15 16
31
Direct addressing-Operand 1
=
2 bytes
71
Indexed by X R-1 -Operand 1
=
1 byte
Bl
Indexed by XR-2-0perand 1
=
1 byte
0011
Device address SIOC (3)
0
Must be zero
001
Load 1/0 function register
SIOC
010
Load SIOC length count register
100
Load SIOC data address register
101
Load data transfer register
Note: All other N codes invalid.
0001
Device address £_rinter keyboard ( 1)
5471
1
Select printer must
Storage address can be one
Printer
be a 1, 0 is invalid.
byte or two bytes (direct
Key·
000
Load EBCDIC
addressed, or indexed).
character to be
The character to be printed
board
is loaded from the first
printed (N code
operand address - 1. All
must be zero.)
other N codes invalid.
1000
Device address BSCA (8)
0
Must be zero
001
Stop address register
BSCA
010
Transition address re_gjster
100
Current address register
110
Current address register (not subject to busy)
Note: All other N codes invalid.
0101
Device address 1442 (5)
0
Must be zero
1442
000
Load punch LCR
100
Load 1442 DAR
Note: All other N codes invalid.
Figure 1-6. (Part 2 of 2) Load 1/0 (LIO) Instruction
1-8
(1/71)
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