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Buffer Selector Instructions
There are six buffer selector instructions.
The register transfer FROM R, and the register
transfer TO T have already been covered.
Mnemonic
LDT
LOAD T.
EXTERNAL FUNCTION DRIVERS
DEF
DRIVE EXTERNAL FUNCTION.
BBC
DEF 1
A
2
B
3
c
4
D
5
E
6
NU
7
NU
8
NU
9
NU
0
NU
Operand
M
I
CBC
A
B
c
D
NU
NU
NU
NU
F
G
Word Times
2
The contents of M are sent to the transmit
data drivers and from there to whichever channel
has been preselected by the contents of the C-
counter.
The contents of M are unchanged
(used only with the CIU-930).
1
A signal will be sent to those external function
drivers which correspond to l's in I.
The
signal(s) will actually get to only the buffer
unit which has been preselected by the C-
counter.
The meaning of each driver varies
witq the particular input/output device.
WBC
RPU
A
""'
B
c
D
NU
NU
)
NU
NU
NU
NU
~
[ID&1J&~~1rc:J ~@------------
II-25
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