RCA Spectra 70 - Page 24

Notes
(Cont'd)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
D
0
0
0
0
0
1
1
1
1
0
0
0
0
Addressing
Table 2A. Analysis of 70/46 Move Instruction Results
1 st Address
2nd Address
S P
Dis
D
S
A B
C+1
0
A
A B
C+1
0
A
A
B+1
000 0
A
A
B+1
000 0 A
A B
C+1
0 A
B
C+1
0
B
C+1
0
B
C+1
0
B
C+1
0
A B
C+l
0 E
A B
C+l
0
E
A B
C+l
0 E
A
B
C+1
0 E
Legend:
D = Direct Address Bit
S = Segment
P= Page
P Dis
B
C
D C
B
FFF
B
FFF
D
C
B C
D C
B
C
D C
B
C
B
C
D
C
D
C
Translation
Result
(B) =1= (D) C+l =1= 0
(B) =1= (B+1)
(B) = (B+1)
(B) = (D)
(B) = B
(D) =1= B
(B) =1= B
(D) =B
(AB) =1= (EB)
(AB) = (EB)
(AB) = (ED)
(AB) =1= (ED)
Dis = Displacement
(X) = X Translated
Instruction
Result
Fill
Move
Fill
Fill
Move
Fill
Move
Move
Move
Move
Fill
Move
Move
Table 2B. Analysis of Overlapped and Non-Overlapped Fields of
70/46 Move Instruction
Overlapped Fields
(Move four byte field starting at Memory Location 1 into destination field
starting at Memory Location 2.)
Memory Locations
2
3
4
5
Before A B C D
E
1st Operation
A A
C
D
E
2nd
Operation
A A A D E
3rd Operation
A
A A
A E
4th Operation A
A A A
A
After
A A A A
A
Non-Overlapped Fields
(Move four byte field starting at Memory Location 1 into destination field
starting at Memory Location 5.)
Memory Locations
2
3 4
5
6
7 8
Before
A
B
C D
Z Y
X
W
1st Operation
A
B
C D
A
Y
X
W
2nd
Operation A
B
C D
A
B
X
W
3rd Operation
A
B
C D
A
B
C W
4th Operation
A
B
C D
A
B C
D
After
A
B
C D
A
B
C
D
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