User`s manual
SYSTEM
CONTROL REGISTER
(SCR)
77
5000
15
14 13
12
11
10
09
08
07
06 05
04
03
02
01
00
NPR
STATUS INT.
OVFLOW INT.
NPR
OVFLOW
REC.INT
RECVR.INT
ROM
DATA
ROM
SINGLE
15
SOURCE
STEP
EN.
I
NT
SERViCE
ENABLE
COMPLETE
NPR
INTERRUPT
MASTER
BIT
15 RECVR.
EXTENDED
ADDRESS
ROM BRANCH
DISABLE
14
ENABLE
CLEAR
WRITE
ENABLE
INTERRUPT
DITt'"
gl
I
~
RECEIVER
INTERRUPT
CHARACTER REGISTER
(RI
C)
775002
(
ALL
BITS
ARE
READ
ONLY)
LIN
E
CONTROL
REGI
STER
(LCR)
775004
(FOR SYNCHRONOUS
LIN
E CARDS)
13
12
11
10
09
08
07
06
05
04 03
02
01
~PROC
GO
11-2684
11-2685
00
RECEIVER~SYNC
AI
STROBE
ENABLE
!
SYNC
B CLOCK
BiTS
MAINTENANCE
MAINTENANCE
TRANSMITTER
MAINT
BIT
DATA MODE
DI
SABLE
WINDOW
"-;>6
Sf'
LINE
CONTROL REGISTER
(lCR)
775004
(FOR
ASYNCHRONOUS
LINE
CARDS)
15
14
13
12
1 1
10
09
08
07
06
05
04
03
02
01
00
I
W W
I
W
I
w
I
w
1
w
I
w
I
X
X
X
R
I
R
I
X
X
I
R
I
R
~
J~
~
~
CONTROL
ASYNCHRONOUS
REGISTER
EXTENDED
BRANCH
STROBE
II
NE
CARD
SELECTION
ADDRESS
TRUE
REGISTERS
CODE
BITS
11-4407
SECONDARY REGISTER SELECTION REGISTER
(SRS)
775006
15
14
13
12
11
10
09
08
07
06 05
04
03
02
01
00
'---
__
---.,""~-
__
--J"'_
____
~
..-
____
-"''-
___
--...,.._------J)''-----_..
.-
____
.J
UNUSED
REGISTER
SELECT
UNUSED
LINE
SELECT
11-2687
SECONDARY REGISTER ACCESS REGISTER (SAR)
775010
11-2688
Figure 3-3
DVll
Primary Registers (Sheet 1
of
3)
3-9