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TRANSMIT-WORD BUFFER-EXAMPLE
Location
Instruction
Symbol
OPR
Operand
x
Remarks
-
07640
ORG
4000
ORIGIN LOCATION 4000
07640
011032
PIC
WBCHN
PUT WORD BUFFER ADDRESS IN C
07641
062004
TRC
O,B
TRANSFER ALL l's TO B
07642
022002
NES
2
TRANSMIT FLAG SET
07643
121642
BZE
*-1
NO, GO BACK
07644
060401
TRA
B,T
YES, TRANSFER WORD TO BUFFER
07645
026010
DEF
4
SET TRANSMIT MODE
07646
605655
LOOP
LDB
NEXTWD
x
LOAD NEXT WORD TO GO
07647
022002
NES
2
TRANSMIT FLAG SET
07648
121647
BZE
~'<'-1
NO, GO BACK
07649
060401
TRA
B,T
YES, TRANSFER WORD TO BUFFER
07650
341655
ADO
NEXTWD
ADD ONE TO OUTPUT AREA ADDRESS
07651
351654
SBO
WDCNT
SUBTRACT ONE FROM WORD COUNT
07652
131646
BNZ
LOOP
BRANCH TO TRANSMIT NEXT WORD
07653
106000
BRU
0
x
BRANCH LOCATION 0
07654
WDCNT
DEC
50
NUMBER OF WORDS TO GO
07655
NEXTWD
IND
6000
OUTPUT AREA INDIRECT ADDRESS
WBCHN
EQU
26
The Receive Parallel Unit (RPU)
The receive parallel unit (RPU) is a 14-channel, parallel-receive-only unit attached to tlie
buffer selector.
Each RPU has an address plug, but no timing plug. Data is received asynchro-
nously at the rate of transmission of the transmitting device.
RECEIYE PAl.ALLEL UNIT INSTRVCTIONS
External Function (DEF) Lines
All 10 DEF lines from the DATANET-30 are brought into the RPU. The line names given apply
to the Bell System's DATA-PHONE Data Set 402B. However, these lines may perform other
functions for other digital subset interfaces.
Mnemonic
Operand
DEF
DRIVE EXTERNAL FUNCTION
I
DEF 1
Reset Character Ready
DEF 2
Reset Answer Back A and B
DEF 3
Reset Answer Back Mode
DEF 4
Set Answer Back Mode
DEF 5
Answer Back A
DEF 6
Auxiliary Function (Set Transit Mode)
DEF 7
Auxiliary Function (Reset Transmit Mode)
DEF 8
Answer Back B
DEF 9
Answer Incoming Call
DEF 10
Disconnect Call
Word Times
1
1
1
1
1
1
1
1
1
1
1
@&u&~~uc:J ~@------------
V-31
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