Xerox 7240 Reference Manual page 26

Removable disk storage system
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Set byte count
equa I to zero.
Increment address register
by
one sec tor.
Request byte from Fast
Access Memory (FAM).
Write heoder byte
into storage device.
yes
Increment byte count.
Set sector
unavailable Flag,
Set
H~ader
Write
error flag.
Set sector
unavai I able Flag.
Figure 9. Header Write Order
18
Programming Considerations
yes
Write a byte
of a 11 zeros.
Write header
parity bytes.
,,...
"
(
\
\ U.Ei
>--------
U. E.
t-----~
,,,,,,
,..

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