Programming Example - GE DATANET-30 Programming Reference Manual

T for T for
Inst.
Y1
Yz
Command Command
Handler Number Word 1 Word 3
WTD
0 2
WTB
2
3
0
0 1
.RTD
0
4
1
0
2
RTB
2 5
2
0 4
RBD 1
4
3
1 0
RBB
3
5
4
2
1
RWD 2 0
5
2 2
WEF 0
2
6
2 4
BKW
1 6
7
3
0
The above tables can be used when setting up the three command words. Before issuing the
command words to the tape controller, the command words are first transferred to memory
locations 3, 4, and 5. A SEL instruction executes the transfer of the command words to the
magnetic tape controller. When the command word instructions are coded, the above octal
coding is used as the operand.
Programming Example
The following example shows how to write 64-word records on magnetic tape handler 2 out of ,
location 500:
Symbol OPR Operand
Remarks
WTB
CSR 1 GET STATUS tINES
NBZ READY TAPE READY?
BZE
*-2
NO, GO BACK
LDB lSTWD GET COMMAND WORD 1
STB 3 STORE IN LOCATION 3
LDD WD2,3 GET WORDS 2 AND 3
STD
4
STORE IN LOCATIONS 4 AND 5
SEL
SELECT PERIPHERAL
NIS
7
SELECT DONE?
BZE
~~-1
NO GO, WAIT
BRU
WTB
READY OCT 000001 BIT 1 TO TEST READY
lSTWD OCT 000201 COMMAND WORD 1
WD2,3 OCT 300500 COMMAND WORD 2
OCT 200100
COMMAND WORD 3
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