2–10
Principles of Operation
P9212 Architectures
The physical configuration of the P9212 is determined by the type of
processor board and interface it uses. Printers that use the Common
Controller Board (CCB) are PROM–based machines. Printers that use the
LMI print engine are floppy–based machines. CT and CTHI models use
translation interfaces that enable them to emulate IBM printers.
The P9212 Line Matrix Printer has four basic equipment configurations.
P9212 (CCB, Triple I/O)
This is the standard model P9212 printer:
♦ It uses the Common Controller Board (CCB) as the print engine. System,
font, and emulation software are stored in PROMs on the CCB.
♦ It processes three kinds of computer input: Centronics parallel,
DataProducts parallel, and RS–232 serial data. This is termed “triple
I/O” because all three interfaces are carried on a common circuit board
assembly and all are processed directly by the CCB.
P9212–CT
This is a P9212 printer that emulates IBM coax and twinax printers:
♦ It uses the Common Controller Board (CCB) as the print engine. System,
font, and emulation software are stored in PROMs on the CCB.
♦ When configured for twinax operation, it emulates IBM 5225 Models 1,
2, 3, and 4 printers, and IBM 4234 Model 2 printers.
♦ When configured for coax operation, it emulates IBM 4234 Model 1 and
IBM 3287 Models 1 and 2 printers.
♦ The printer is equipped with a coaxial/twinaxial integrated interface
assembly, referred to as the CT. The CT board converts IBM’s EBCDIC
to an expanded ASCII character set and sends the data to the CCB for
further processing.
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