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Appendix A System Interface Description
A-10
3. Shared Operation
In shared operation the interface buffer capacity is reduced by 256 bytes.
After Power-ON both the serial and the parallel interfaces are available for data
transfer.
If a byte is first recognized by the serial interface the parallel interface is imme-
diately disabled by the BUSY signal. The serial interface is now active and will
operate, using the installed protocols.
If a byte is first recognized by the parallel interface either the DTR signal of the
serial interface is set to OFF or XOFF is sent, depending on the protocol.
If the serial interface starts to receive data while the parallel interface is active, it
is possible to receive 256 bytes of serial data. Any additional serial data will be
lost.
When the interface buffer is completely empty of serial data, and no new data
has been received by the serial interface for more than 10 seconds, both
interfaces are available for data transfer again.
When the interface buffer is completely empty of parallel data and no data has
been received by the parallel interface for more than 60 seconds, the 256 bytes
of serial data will be processed. Afterwards, both interfaces are available for
data transfer again.