NEC D2246 Maintenance Manual page 74

8-inch winchester disk drive
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(Minimum)
200
ns
(Minimum)
200
ns
r . .
------....,.~I
"A" UNIT SELECT BITS
_
~""0'"%77'~;"",;;,";;7"'"; ,"";;'"<'??:<0'"-;;;'"<~~/""" -------------~
"A" UNIT SELECT TAG
"A" UNIT SELECTED
"A" RESERVED F/F
(INTERNAL STATE)
"A" RESERVED
(INTERNAL STATE)
~ :~x~~um)
I ....
~·~I>--- ~:x~~"m)
_______ I __
~
r _ I
-----------------~I
___________________ _
~600"'
(Maximum)
I
I
100 ns
t-1 -
(Maximum)
"A" RELEASE COMMAND _ _ _ _ _ _ _ _ _ _ _
....JnL. ___________________ _
"S" SEEK END
"B" UNIT SELECT TAG
"B" UNIT SELECTED
"B" RESERVED F/F
(INTERNAL STATE)
"B" RESERVED
(INTERNAL STATE)
I
30",s
~(NOminall
---------------------, U
I
l
I
I
I
"B" RELEASE COMMAND _ _ _ _ _ _ _ _ _
-+ ________
~
_______
....J
"B" BUSY
Figure 8-3 Unit Select Timing for Dual-Port Option
8-5
L
l

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