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3.4.9
Sector count switch (DIP switches)
The number of bytes per sector in Fixed Sector Format is determined by the
switches according to the following figure and example.
Byte
Counter
....
......
........
......
....
....
....
....
'-
8
A
,,"
r-----~~----~
Figure 3.4.4
Sector count switches
Example; 9 Sectors/Track
Bytes/Sector
= sBy~es/~~ackk = 40,~60
=
4,551.11
ec ors
rac
"
"
"
"
/
If the above calculation results in a remainder, round it up to the next
integer, i.e., Bytes/Sector
=
4,552
"
" "
Set this figure minus one with jumper plugs to allow the Byte Counter to start
counting from zero.
4,552-1
=
4,551
=
4,096
+
256
+
128
+
64
+
4
+
2
+
1
B
A
Therefore, set 4 and 8 of the B-dip switch and 1, 2, 6, 7 and 8 of the A-dip
switch on, and all the rest of the switches off.
In this case, the number of bytes in the last sector is calculated as follows.
40,960 - 8 x 4,552
=
4,544
Namely, the last sector is eight bytes shorter than the others.
Refer to Table 3.4.4 for the settings of DIP switches.
3 - 12
B03P-4825-0002A •.•
Ol
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