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generate a Read Station Empty Status (43-B04-l7), satisfy AND gate
(!)
(which
sends a Stop signal to the reader, causing mechanical movement to stop)
and
sets the Alarm FF (page 41).
LOST DATA
If the computer does not accept data from the Data Register before the next
column enters the read station and the Clock pulse is generated, data in the
Data Register will be lost.
At time 1 of the Timing Chain, the Lost Data FF
would set causing:
(1)
The Alarm FF (page 41) to set, giving an Alarm status and enabling
an Interrupt on Alarm.
(2)
The Data FF (page 41) to clear, removing data status.
(3)
The Motion FF (page 41) to clear so that the next card to enter the
read station stops on column 1.
When Lost Data occurs, the card continues to move through the card reader but
signals from the reader have no effect upon the controller logic.
When the
next card enters the read station, the RSE signal clears the Lost Data FF and
removes Lost Data Status.
The Alarm status remains until cleared by the proper
Function code (or Master Clear).
A normal read can now be performed on the card
presently in the read station.
START MOTION DURING CARD READ
If a Start Motion function is requested while a card is moving through the read
station, logic gate
[£J ,
Z30 module, page 41, outputs a logical 1.
This will
set the FF whose cleared output is
~
, near the top of the module.
When this
FF sets, the set input to the Data FF becomes disabled preventing Data Status.
5-8
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