Character Buffer Channel (Cbc - GE DATANET-30 Programming Reference Manual

Location Instruction Symbol
OPR Operand
x
Remarks
REM SAMPLE PROGRAM INTERRUPT EXECUTIVE
00000 ORG 0000 ORIGIN OF SUBROUTINE LINK
00000
000000
PIE IND 0 LOCATION ZERO
00001 017500
IND
P!El
LOCATION ONE
17500 ORG
8000
ORIGIN OF PIE SUBROUTINE
17500 361514 P!El STF PIEF STORE FLIP-FLOPS
17501 231515 LDQ PIEQ LOAD Q-COUNTER
17502 301511 STC PIEC
STORE C-COUNTER
17503 311512 STD PIED STORE A- AND B-REGISTERS
17504 030001 SCN 1 SCAN BIT BUFFERS
17505
211512 LDD PIED LOAD A- AND B-REGISTERS
17506 201511 LDC PIEC LOAD C-COUNTER
17507
261514 LDF PIEF LOAD FLIP-FLOPS
17510 106000 BRU PIE
x
BRANCH BACK TO EXIT POINT
17511
000000 PIEC DEC
0
TEMPORARY STORAGE FOR C-COUNTER
17512
000000 PIED DEC
0
STORAGE FOR A-REGISTER
17513
000000 DEC 0 STORAGE FOR B-REGISTER
17514 000000 PIEF DEC 0 FLIP-FLOP STORAGE
17515 003554
PIEQ DEC
1900
Q-COUNTER STORAGE (CONSTANT)
Character Buffer Channel (CBC)
The character buffer channel provides the interface to a half-duplex transmission line. The
standard bit stream lengths are 5, 6, 7, and 8 bits. The character buffers should be used on
lines operating at 300 bits per second or greater.
CHARACTER BUFFER INSTRUCTIONS
Mnemonic Operand
Word Times
Register Transfer ,T
{TRA from to T)
DEF
DEF 1
DEF 2
DEF 3
DEF 4
DEF 5-8
DEF 9
DEF 0
---
The least significant 5, 6, 7, or 8 bits of the
Z drivers are sent to the transmit data buffer
and the transmit flag is reset.
I
Reset receive flag and data register.
Reset transmit flag and data register.
Set receive mode (turn carrier off).
Set transmit mode (turn carrier on).
Not used.
Answer incoming call.
Disconnect call.
1
[ID!A\1f
&~~1f CJ~@------------
V-21