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H
Sector Write Disc Normal (SWN)
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.
Format
Operation — FI
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 O verride Any DDF
Simultaneous Instruction
Will Ov erride Any DDF
Simultaneous Instruction
Bj, B
, B
2
3
Direction of Operation
Left to right in HSM.
Outline of Operation
The contents of the HSM diad specified by the A Address are transferred to the Data Disc File Buffer and from
the buffer to the specified sector. The contents of the A Register are incremented by two, and the contents of the
next diad are then transferred. When the additional number of sectors has been written, according to the N character
the operation terminates.
If this instruction contains a bit in the B
Mode, the Simultaneous Instruction being performed will be terminated on the next transfer of data to or from the
file. The new instruction will then be executed in the normal manner.
Final Register Contents
(A)
= Address of HSM location one to the right of the last character written.
f
(B)
= (B)
{
t
XII-8
0
0
&
0
0
&
— specify zone to which data is to be written:
Module
1
2
3
4
position and the selected Data Disc File is busy in the Simultaneous
2*
0
2
4
5
1
3
2
4
5
1
3
C
D
E
A
B
2
4
5
1
3
4
1
2
5
3
E
A
B
C
D
Zone
000 to 107
108 to 215
216 to 323
324 to 431
6
7
8
9
6
7
8
9
G
H
I
F
6
8
7
9
6
7
8
9
H
I
F
G
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- The Rca 301 Code
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