RCA 301, Programmer'S Reference Manual

Page: 56 / 235

N Transfer Data Right (DR)
Re pea table
General Description
This instruction transfers a specified number of consecutive characters from one HSM area to another. It may
be used to transfer from one to forty-four characters in memory.
Format
Operation — N
N —0-44 characters to be transferred. (See Appendix F-I.)
A Address — HSM location of rightmost character to be transferred.
B Address — Destination address of first character.
Direction of Operation
Right to left.
Outline of Operation
This instruction operates in the following cycle:
The contents of the N Register are examined. If zero, the instruction terminates. If other than zero, the character
specified by the A Register is transferred to the HSM location specified by the B Register. The contents of the
A and B Registers are decremented by one, the contents of the N Register are decremented by one, and the cycle
is repeated. The A address and the B address will be staticized although N may equal zero.
Final Register Contents
( A )
f
= A d d r e s s o f l o c a t i o n o n e t o t h e l e f t o f t h e l a s t c h a r a c t e r t r a n s f e r r e d .
(B)
r
= Address of location one to the left of the last destination location.
Timing
Total time in microseconds.
= I4n + 35, where n equals the number of characters transferred.
Example
Instruction:
Operation N A Address B Address
N
4 1003 1009
HSM before Instruction is Executed:
1000
1001
1002 1003
1004 1005
1006 1007
1008
1009
B
0 0 K
—
— —
— —
—
HSM after nstruction is Executed:
1000 1001
1002
1003 1004
1005
1006 1007
1008
1009
B
0
0 K
—
—
B
0 0
K
Final Register Settings:
(A), = 0999
(B)
f
- 1005
Time:
(4 x 14) + 35 = 91 fxs.
V-10