GE DATANET-30 Programming Reference Manual page 73

Indexing
During indirect addressing, the first operand address can be indexed by any one of A-, B-, or C-
registers by specifying which register in the pointer. Bits 16-17 of the indirect address word
specify which register to be used for indexing as follows:
Pseudo-
Bits ~18-17-16~ Function QEeration
000
No indexing
IND
001
Index by A INA Base address indexed by contents of A
010
Index by B
INB Base address indexed by contents of B
011
Index by C INC
Base address indexed by contents of C
The pseudo-operations IND, INA, INB, and INC are used by the General Assembly Program
to automatically add these bits as required.
_!&£__
INSTRUCTION
04000 601100
04001
404400
-.
04400
204401
04401 000054
04402 000056
04403 000046
04404
000002
05100 000002
04000 201100
04001 104400
10000
010200
10001
010300
10002
010400
10003 010500
OPR OPERAND
ORG 2048
~~
*
Convert Octal digit to baudot
*
LDB DIGIT
LDA BAUD OT
x
*
~~ BAUDOT CONVERSION TABLE
*
BAUDOT INB *+l
OCT 54
OCT 56
OCT 46
OCT 02
DIGIT OCT 000002
*
~~ Branch to switch table
*
Depending on contents of c-register
~~
ORG
2048
LDC DIGIT
BRU $POINT
x
ORG 4096
$POINT IND
ENTER 0
IND
ENTER 1
IND
ENTER 2
IND
ENTER 3
111-6
REMARI{S
Pick up octal digit
Convert
Octal to Baudot Conv Table
Baudot Char 0
1
2
3
Pick up value in C-reg
GO TO ENTER 0 IF C 0
"
1 1
2 2
"
3 3