RCA 301 Programmer's Reference Manual page 164

I Sector Write Disc S imultaneous (SWS)
General Description
This instruction writes from a selected HSM location to designated sectors of the Data Disc File. From one to
ten sectors of information may be transferred to the Data Disc File with one instruction. 160 characters are transferred
for each sector written; however, this instruction may be terminated by any other Data Disc File instruction to the
same File when the terminating instruction has the proper B
Format
Operation —I
N — Specifies additional number of sectors to be written.
Additional Sectors
First File
Second File
A Address — HSM Address of the first character to be written. This address must be an even number (left-hand-
end of a diad).
B Address — B — designates the first sector to be written:
0
First Sector to be Written
Will Not Ov erride Any DDF
Simultaneous Instruction
Will Ove rride Any DDF
Simultaneous Instruction
B„ B , B
2 3
Direction of Operation
Left to right in HSM.
Outline of Operation
Initially this instruction is staticized in the Normal Mode. If the Simultaneous Mode is free and the SMDI button
is not on, the contents of the NOR, N, A and B Registers are transferred to the SOR, M, S and T Registers, respec­
tively; and this instruction is executed in the Simultaneous Mode. As soon as the Normal Mode is interruptable,
the contents of the HSM diad specified by the S Register are transferred to the Data Disc File Buffer and from the
buffer to the specified sector. The contents of the S Register are increased by two, and the contents of the diad
specified transferred in a like manner. When the additional number of sectors has been written, according to the
N character, the operation terminates.
The operation may also be terminated by another Data Disc File instruction to the same file when the B„ c haracter
of the overriding instruction ranges from
XII-10
0
0
&
0
0
&
— specifies zone to which data is to be written:
Module
1
2
3
4
to "I" as specified above.
override character.
0
4
2 5
1 3
2 4 5
1 3
B C D E
A
4 5
1 2 3
4 5
1 2
3
D E
A B C
Zone
000 to 107
108 to 215
216 to 323
324 to 431
8
6 7 9
6 7 8 9
I
F G H
6 7 8 9
8 9
6 7
I
G H
F