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RCA Spectra 70 User Manual

RCA Spectra 70
260 pages
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logical
(ClR) (Cl)
(CLI)
(ClC)
General Description
Format
(RR)
(RX)
(51)
(55)
Condition Code
Interrupt
Action
Notes
Logical
Instructions
The operand specified
by
the
first
address
is logically compared
with
the
operand specified
by
the
second address
(RR
format:
Rl to R
2
;
RX
format:
Rl to X
2
/BdD
2
;
SI
format:
Bt/Dl
to 1
2
; SS
format:
Bt/Dl
to
BdD
2
).
The
result
of
the
comparison determines
the
condition code. These
instruc-
tions process all bits
as
part
of
an
unsigned
binary
quantity.
All codes
are
valid
and
the
instruction
is
terminated
on inequality
or
when
the
operand
bytes have been exhausted.
I
(CLR)
15 I
Rl
I
R2
I
0 7
8 11 12 15
(CL)
55
I
Rl
I
X
2
I
B2
D2
0
7 8
11 12 15
16 19
20
31
I
(CLI)
95 I
12
I
Bl
I
Dl
o 7 8
15 16 19
20
31
I
(CLC)
D5 I
L
I
Bl
I
Dl
B2
o 7 8
15 16 19
20
31 32 35 36
0 -
the
operands
are
equal.
1 -
the
first operand is less
than
the
second operand.
2 -
the
first operand is
greater
than
the
second operand.
3
-not
used.
Address
error:
Addressing (RX, SI, SS
only).
Specification
(RX
only).
1. Both operands
are
unaltered.
D2
47
2.
In
the
SI
format,
the
immediate
byte
in
the
12
field
of
the
instruction
being executed is
the
second operand.
3. Processing is
from
left
to
right
and
can
extend
to
field
lengths
of
256 bytes.
4.
The operation
can
be used
for
alphanumeric comparisons.
174

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RCA Spectra 70 Specifications

General IconGeneral
ManufacturerRCA
ModelSpectra 70
CategoryComputer Hardware
Word Size32 bits
MemoryUp to 512 KB
PredecessorRCA 3301
SuccessorRCA Series

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