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The 400 usec time delay insures that data transfer into the Holding Register
occurs during that time when the punched data holes are positioned directly
over the read station photo diodes.
After the 400 usec time delay, a Delayed
Feedhole signal sets the Feed 2 FF (page 31).
When the Feed 2 FF sets, a logical "0" appears 29-A14-13 which:
(1)
disables the first 40 msec time delay (29-A12-2)
(2)
sets the Data Ready FF if the following conditions are met:
(Reader
Ready) (Feed 1) (Lost Data).
Setting of the Data Ready FF (page 29) will:
(1)
provide a Data status bit (3l-A16-23) if the Start FF is still set
and one of the following conditions are met:
(Reid)
+
(Protect Fault).
(2)
Enables a Data interrupt to the computer if the Data Interrupt FF
(page 31) is set.
(3)
set Lost Data FF (page 29) if the Feed 1 FF is still set.
(4)
Disable the set input to the Clutch FF (page 31).
(5)
Clear the Clutch FF upon the trailing edge of the feedhole signal if
a Data Interrupt has not been selected.
This will cause paper motion
to stop.
(6)
Enable the clear input to the Feed 1 FF (page 31)
(7)
Clear the Feed 1 FF (page 31) if the feed 2 FF is set.
When the feedhole passes the read station, the Feedhole signal drops, enabling
several operations to occur:
(1)
Stop tape motion if a Data Interrupt has not been selected.
This
allows reading one frame and stopping until the information is
tev.
A
3-4
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