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Step-by-step guide to installing the Zebra RS-232 circuit board inside the TS2050 modem case with a 3PDT switch for selecting between modem and RS-232 modes. Includes wiring diagrams, pin assignments for a Xerox Memorywriter connection, and BASIC software for driving the printer via the RS-232 port. Uses DS14C88/DS14C89 CMOS driver chips to reduce heat.