P9212 Lmi (Quad I/O); P9212 Cthi - Printronix

P9212 Maintenance Manual

P9212 LMI (Quad I/O)

This is a P9212 printer with a diskette drive and a different controller
scheme:
♦
It uses the Line Matrix Impact (LMI) print engine and disk controller
board.
♦
The 030 microprocessor board plugs into the LMI print engine board.
♦
The LMI/030 board combination plugs into the Feature Backplane board.
♦
It has a floppy diskette drive controlled by the LMI via the Feature
Backplane board.
♦
System, emulation, and font software are loaded into printer memory via
diskette.
♦
The printer uses the "Quad I/O," an interface assembly with Centronics
parallel, DataProducts parallel, RS–232 serial data connectors, and a
9–pin RS–232 diagnostics port.

P9212 CTHI

This is a P9212 LMI printer capable of emulating IPDS IBM printers:
♦
It uses the Line Matrix Impact (LMI) print engine and disk controller
board.
♦
The 030 microprocessor board plugs into the LMI print engine board.
♦
The LMI/030 board combination plugs into the Feature Backplane board.
♦
It has a floppy diskette drive controlled by the LMI via the Feature
Backplane board.
♦
System, emulation, and font software are loaded into printer memory via
diskette, enabling the P9212 to emulate an IBM 4234 Model 011 (coax)
and Model 012 (twinax) IPDS printer.
♦
The printer is equipped with the Coax/Twinax Host Interface (CTHI)
board, which converts IBM protocols into an expanded ASCII character
set and sends the data to the LMI for further processing.
Principles of Operation 2–11