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K->FA:
The CK field is used to set and
reset latches in the multiplexor FA
register, singly or in combination.
The
value of the CK field is shown on the E
line of the CLD box.
The PK bit is
necessary and its condition is also
specified on the E line.
If
the CK
field value is 3 and the PK bit is used,
on the E line you will find K=0011 Pl.
K->FE:
TheCK field and the- PK tit
control the set and reset of some multi-
plexor or FE register latches.
This
mnemonic also provides a gate for the
set and reset of other latches.
R
=
vno:
Each half of the R-register is
checked for a valid decimal digit.
Positions
0-3
and
4
through
7
of the
R-register, if valid, contain any digits
from 0 through
.9.
V67=O:
Positions 6 and 7 of the
v-
register are tested.
If both positions
are 0, the X6 position of ROAR is set to
one~
Status:
The bits of the S-register
normally are set and reset to control
specific functions.
so
True or complement.
If SO is a
o
the operation to be executed
is true (used when the CV field
is coded!).
51
A 1050 request will set S1 to
1.
S2
52 is set to a 1 if there is a
bit on the Z bus.
AN5NZ->S2.
53
Carryout from ALU.
This bit is
used with the CC field decoding
4,5,
and
6.
54
55
56
57
High Z bus zero
Low Z bus zero
Miscellaneous
Miscellaneous
PARITY EIT5
•
The PK bit provides odd parity for
the CK or the CA fields.
•
The PA bit provides odd parity on
the ROAR address.
•
The PC bit provides odd parity on
the .control registers.
•
The P5 bit provides odd parity for
the 5ALs.
•
The PN bit provides odd parity for
the CN field.
The PK bit is used with either theCA or
the CK field.
When the CK field is used
as a constant in an arithmetic
statement, the PK bit is not specified
(0).
If K appears in a storage
statement (*KBE->N), or in a statement
which changes the W-register, the PK bit
is used to provide odd parity on the CK
field.
In the expression K->W the CK
field is used to set the W-register.
If
the value in the CK field is 0011 (3)
the PK bit must be a one to maintain odd
parity of the CK field.
If the CA field
is used to set the W-register,
CCA->~,
the PK tit maintains odd parity for the
CA field.
3-51
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