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B.4.2 Digital output register (3F2H Write)
Bit
7
I
6
5
4
3
2
,
0
Not used
MONB
MONA
IDEN
FRST
DSL1
OSLO
+ MONB
When this bit is
"1",
motor of the drive B is
on.
+
MONA
When this bit is
"1",
motor of the drive A is
on.
+ IDEN
When this bit is
"1",
IRQ and DRQ are
enabled.
- FRST
When this bit is "0", the FDC (TC8565F) is
reset.
+ DSLI
&
+DSLO
+ IDEN
When both of these bits are "0", the drive A
is selected.
When DSLI is "0" and OSLO is "1", the drive B
is selected.
When this bit is "1", the following signals
are enabled.
TCO, DACK20, DRQ2l, IRQ6l
B.4.3 X-Rate register (3F7H Write)
Bit
3
2
,I
Rat~-1
1
Ra~.o
I
5
J
4
6
Not used
X-Rate - 1
X-Rate - 0
0
0
360rpm, 500 kb/s, MFM
0
1
360rpm, 300 kb/s, MFM
1
0
300rpm, 250 kb/s, MFM
1
1
Not used
B - 9
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