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Principles of Operation
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.
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