Xerox 4215 Operator's Manual page 393

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paper jam
parallel interface
parallel/serial ports
parity
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When paper gets stuck somewhere along
the paper path, this is referred to as
a paper jam.
A type of interface in which data is
transmitted and received in bytes
rather than bits.
printing over short distances (10
meters or less).
The printer comes with two interface
connectors, serial and parallel,
located on the lower part of the back
panel. The cable that attaches your
computer and printer is connected
here.
Parity is the addition of one or more
redundant bits of information used to
verify data accuracy.
ASCII code, seven bits are used to
represent the value of a character and
the eighth bit is for parity.
parity is to be used, there must be an
even number of 1 bits in the
character; thus, if the information
bits contain an odd number of 1 bits,
the parity bit is set at 1, otherwise,
it is left as 0.
the transmission of data, both the
computer and the printer must
calculate parity in the same way.
printer receiving information compares
its parity calculations with those
transmitted by the sending computer.
XEROX 4219/MRP Mid Range Systems Printer
XEROX 4215/MRP Mid Range Systems Printer
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Operator Guide
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