IBM 6500 User Manual page 144

Data Polarity
The DATA POLARITY parameter must be set to match the data polarity of your
host computer.
v Standard (the default). Does not expect the host computer to invert the data.
v Inverted. Expects the host computer to invert the data received on the data
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.
v Standard (the default). Does not expect the data strobe signal to be inverted.
v 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.
v Standard (the default). Does not invert the response signal.
v Inverted Inverts the response signal sent to the host computer.
Busy on Strobe
BUSY ON STROBE determines when the Busy signal is asserted.
v Enable (the default). Asserts a busy signal after each character is received.
v 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.
v Leading Edge (the default)
v Trailing Edge
Prime Signal
v Enable (the default). When set and the host asserts the PRIME SIGNAL, the
v Disable. The parallel port will not perform a warm start when the host asserts
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Infoprint 6500 User's Manual
lines. Ones become zeros, and vice–versa.
parallel port will perform a warm start.
the PRIME SIGNAL.