IBM 6400 Setup Manual page 149

Data Polarity
The DATA POLARITY parameter must be set to match the data polarity of
your host computer.
•
STANDARD (the default) does not expect the host computer to invert the
data.
•
INVERTED expects the host computer to invert the data received on the
data lines. Ones become zeros, and vice–versa.
Strobe Polarity
The STROBE POLARITY must be set to match the data strobe polarity of
your host computer. When the host computer sends a data strobe signal to
the printer, this enables the printer to read the data bus.
•
STANDARD (the default) does not expect the data strobe signal to be
inverted.
•
INVERTED expects the host computer to invert the data strobe signal.
Response Polarity
The RESPONSE POLARITY parameter must be set to match the response
polarity of your host computer.
•
STANDARD (the default) does not invert the response signal.
•
INVERTED inverts the response signal sent to the host computer.
Busy on Strobe
BUSY ON STROBE determines when the Busy signal is asserted.
•
ENABLE (the default) asserts a busy signal after each character is
received.
•
DISABLE asserts a busy signal only when the print buffers are full.
Latch Data On
The LATCH DATA ON parameter specifies whether the data is read on the
leading or trailing edge of the data strobe signal.
•
LEADING EDGE (the default)
•
TRAILING EDGE
Prime Signal
•
ENABLE (the default). When set and the host asserts the PRIME
SIGNAL, the parallel port will perform a warm start.
•
DISABLE. The parallel port will not perform a warm start when the host
asserts the PRIME SIGNAL.
PC Parallel Menu
149