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2.4.2 Control Mode Switch Assembly
The control mode switch assembly (shown in Figure 2-8) configures the D2246 to
communicate with the disk controller and enables certain optional drive features.
Segment 1 is set to 1.
Segments 2 and 3 are set to O.
Segment 4 enables the Address Mark function.
Segment 5 enables the Read Sector function. When segments 5 and 7 of the control mode
switch assembly are set to 1, Tag 4 can be used with bus bits 8 and 9 to request the current
sector address. The D2246 issues the current sector address across the sense lines.
Segment 6 enables the Format Write Release Option used with some controllers.
Segment 7 enables the Tag 4 line.
Segment 8 enables the controller interface.
SETTO 1
SET TO 0
1--_.1..-1
1 ON
OOFF
INTERFACE ENABLE
TAG 4 ENABLE
ON LINE
OFF LINE
L..-_ _ .....
FORMAT WRITE RELEASE ENABLE
ADDRESS MARK ENABLE 1 - - - - -......
~----f
READ SECTOR ENABLE
Figure 2-8 Control Mode DIP Switch
2-6
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