RCA Spectra 70 Training Manual

LOAD AN D STORE REGISTER
There are two instructions that enable the program-
mer to address registers so that he may either load
a value in the register(s) selected, or store the con-
tents of the register(s) in memory.
The four-byte memory locations used for either
storing or loading registers must be word-oriented.
LOAD MULTIPLE
This instruction places designated value(s) into one
or more consecutively numbered general registers.
The following instruction:
NAME
OPERATION
OPERAND
LM
3,3, ALPHA
loads General Register 3 with the value stored in the
word-oriented four-byte addresses by ALPHA.
The instruction below loads General Registers 2, 3,
4, 5, 6, and 7 with the values stored in the word-
oriented 24 bytes addressed by ALPHA.
NAME
OPERATION
OPERAND
Example:
HSM BEFORE
AND AFTER
EXECUTION
LM
GENERAL REGISTERS 1-8
BEFORE EXECUTION
ASSEMBLY
INSTRUCTION
NAME
2,7, ALPHA
1
I
0000
10
3
I
8192
10
5
I 16384
10
7
I 24576
10
OPERATION
LM
2
I 4096
10
4
I 12288
10
6
I 20480
10
8
I 28672
10
OPERAND
2,7, ALPHA
41
OP
B2
GENERATED
INSTRUCTION
1
98
16 2
10
\7 10 \110 \2400
16
1
GENERAL REGISTER 1 = 0000
10
(AS ABOVE)
GENERAL REGISTERS 1-8 1 2
FOLLOWING EXEOUTION
I
000010
1000
10
3 4
I
2000
10
3000
10
5 6
I
5000
10
6000
10
7 8
I
7000
10
28672
10
STORE MULTIPLE
This instruction places the contents of one or more
consecutively numbered general registers into mem-
ory. The locations that store the register(s) must
be word-oriented. A full word is used for the storage
of the contents of each register.
The Operand format is the same as for the LOAD
MULTIPLE instruction.
Example:
GENERAL REGISTERS 1-8
1
BEFORE AND AFTER
I
0000
10
EXECUTION
3
I
2000
10
5
5000
10
7
I
7000
10
HSM BEFORE
EXECUTION
ASSEMBLY
INSTRUCTION
GENERATED OP
Rl R3
B2 D2
INSTRUCTION
1
9011
;
I
2
10
7
10
1
10
240°10
GENERAL REGISTER 1 ~ 0000
10
(AS ABOVE)
HS;\1 AFTER
EXECUTION
2
I
1000
10
4
I
3000
10
6
I
6000
10
8
I
28672
10

RCA Spectra 70 Specifications

General

Manufacturer	RCA
Model	Spectra 70
Category	Computer Hardware
Word Size	32 bits
Memory	Up to 512 KB
Predecessor	RCA 3301
Successor	RCA Series