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Xerox 7120 Reference Manual page 12

Card readers
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Table 4. Automatic Mode Stacking Action
Order
Stacking Action t
X'06'
X'16'
X'36'
X'OE'
X'lE'
X'3E'
Model
7120
Stack card in normal stacker.
Stack card in alternate stacker 1.
Stack card in alternate stacker
2.
If no validity error or data overrun occurs,
stack card in normal stacker; if validity
error or data overrun occurs, stack card in
alternate stacker
2.
If no validity error or data overrun occurs,
stack card in alternate stacker 1; if validity
error or data overrun occurs, stack card in
alternate stacker 2.
Stack card in alternate stacker 2.
Model
7140
Stack card in normal stacker.
Stack card in alternate stacker.
Stack card in normal stacker.
If neither validity, data overrun, nor read
verify error occurs, stack card in normal
stacker; if error occurs, stack card in alter-
nate stacker.
Stack card in alternate stacker.
Same as 'OE'.
tModels
7121/7122
accept all the above order codes but offer no alternative stacking since they have only one stacker.
READ CARD AUTOMATIC
The orders (hexadecimal code) listed in Table 4 cause the
card reader to feed and read a card in the automatic mode,
with the card being directed to one of the multiple stackers.
To facilitate reading of intermixed EBCDIC and binary card
decks, card column 1 is sensed for the presence of punches
in rows 1 and 2;
if
both are present, the read operation is
automatically forced to the binary read mode and all data,
including column 1, is transmitted as described previously
under "B inary Card Format".
In the EBCDIC card format, 80 bytes are present on a card.
Incorrect length will be signaled if either fewer or more
than 80 bytes are requested for an EBCDIC card. However,
if the binary read mode is invoked automatically, incorrect
length will be signaled if either fewer or more than
120
bytes are requested.
KEY EVENTS
The key events that occur during a card read operation are
described in the following paragraphs.
No chronological
order should be assumed from the order of presentation.
Timing information is discussed under "Programming
Considerations" •
START INPUT/OUTPUT
A card read operation is initiated with the execution of a
START INPUT/OUTPUT instruction by the controlling sys-
tem. If I/O address recognition exists and the reader is in
the "ready" condition with no interrupt pending, the con-
trolling system sets its "I/O address recognition" and
"510
6
Key Events
accepted" indicators.
The card reader advances from the
"ready" to the "busy" condition and, if the reader is in the
"automatic" mode, it requests an order byte from the con-
trolling system. Note that
"510
accepted" does not mean
that the card reader has started to feed and read a card.
"510
accepted" signifies only that a device has accepted
the
510
instruction and the device was in the "ready" con-
dition with no interrupt pending.
UNUSUAL END CONDITIONS
The detection of any of the following during the "busy" con-
dition causes the card reader to return an "unusual end" indi-
cation to the controlling system at the time the condition
occurs:
1.
Invalid order code
2.
Read station malfunction
3.
Transport mechanism malfunction
4.
Absence (or failure) of ac and/or dc power in reader
5.
Operator pressing the RESET switch
6.
The occurrence of a data overrun
7.
lOP Halt (not applicable to Sigma 2)
CHANNEL END CONDITIONS
After receiving an order from the control
I
ing system, the
card reader signals "channel end" to the controlling system
when the end of the card is encountered or an "unusual end"
condition occurs, whichever occurs first.

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