RCA 301, Programmer'S Reference Manual

Page: 58 / 235

P Transfer Data By Symbol Right (DSR)
Repeatable
General Description
This instruction transfers data terminated by a selected symbol from one HSM location to another.
Format
Operation — P
N — Selected symbol on which to stop transferring.
A Address — HSM location of rightmost character to be transferred.
B Address — Destination address of first character.
Direction of Operation Standard Location
Right to left. STA (0212-0215)
Outline of Operation
This instruction operates in the following cycle:
The contents of the HSM location specified by the A Register are compared with the contents of the N Register.
The character specified by the A Register is transferred to the HSM location specified by the B Register and the
contents of the A and B Registers are decremented by one. If the comparison proved equal, the instruction terminates.
If the comparison proved unequal, the cycle is repeated.
Final Register Contents
(A), = HSM address of location one to the left of the specified symbol in the original area.
(B)
f
= HSM address of location one to the left of the symbol in the destination area.
Timing
Total time in microseconds
= I4n + 49, where n equals the number of characters being transferred.
Example
Instruction:
Operation N A Address B Address
P " 3008 3003
HSM before Instruction is Executed:
2999
3000 3001 3002
3003 3004 3005 3006 3007
3008
— — — —
—
> >
$
4
3 2
HSM after Instruction is Executed:
2999 3000 3001
3002 3003 3004 3005
3006 3007
3008
> >
$
4
3
2 ft
$ 4
3
2
Final Register Contents:
(A)
f
= 3003
(B)
f
= 2998
Time:
(5 x 14) + 49 = 119 [is.
V-12