Control Data 3100 Reference Manual page 137

23
18 17 16 00
73
11~
23 21 20 18 17 16 00
ch 0
IINT~
23
00
Reject Instruction
ch
=
I/O channel designator, 0-3
I NT
= "1" for interrupt upon completion
(Approximate execution time: 7.0
p.sec.
+
response time.)
Instruction Description: This instruction transfers a 6-bit character from an external equip-
ment into the lower six bits of the A register. A is cleared prior to loading, and the upper 18
bits remain cleared.
Comments: Bits 00-16 at P and P
+
1 should be loaded with zeros.
1/0 OPERATION WITH A
INSTRUCTION SEQUENCE
LOAD
START
(P)---+F
(FCN REG)
REQUEST
BLOCK
CONTROL
f
READ
(P
+
1)
CHANNEL
BUSY?
(P
+
1 )---+Zo
(P) ---+ Zl
I~
Rev. B
/
WAIT FOR BLOCK CONTROL
THEN S BUS PRIORITY.
ACTIVATE READJ STORE Zo (P+ 1)
WRITE ON 1/0 .. IN ONE REGISTER
CHANNEL 0 ---+ 3
(00 ---+ 03)
OPERATION NO
1---'*
WITH A?
RNI
FROM
P+3
YES
3
YES
STORE Zl (P)
.. IN ONE REGISTER
(10---+ 13)
7-80
REJECT
TO
P+2
RELEASE BLOCK
.. CONTROL AND
SCANNER
~