IBM 6400 Setup Guide

4–51
Chapter 4. Configuration Menus
Data Bit 8
The DATA BIT 8 parameter allows access to the extended ASCII character
set. This parameter is enabled by default. When this parameter is disabled,
the printer interprets bit 8 of each incoming data character as a zero,
regardless of its actual setting.
PI Ignored
The PI (Paper Instruction) signal is used to control vertical paper motion.
• ENABLE (the default) ignores the PI signal and treats the the data as
characters or control codes.
• DISABLE causes the printer to interpret the eight data lines as VFU
commands when the PI signal is true.
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.
Data Request Polarity
The DATA REQUEST POLARITY parameter must be set to match the data
request polarity of your host computer.
• STANDARD (the default) does not invert the request signal.
• INVERTED inverts the request signal sent to the host computer.
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.

IBM 6400 Specifications

General

Brand	IBM
Model	6400
Category	Printer
Language	English