Intel INTELLEC Hardware Reference Manual page 97

Double density, diskette operating system
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INPUT DRIVE
READY STATUS
NEW
STATUS
OLD
STATUS
UPDATE
STATUS
COMMAND
PENDING
SET STATUS
CHANGE INTERRUPT
INDEX
PULSE
TIME
TO UNLOAD
HEAD
7
UNLOAD
HEAD
JUMP TO COMMAND
(MAL.STIO.RR)
Figure 6-2
MAINLINE
6-3

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