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  · myoldmac.net · Vintage Apple Macintosh Computer ·

Apple Super Serial Card II
670-8020-B - 1981

The Apple II Super Serial Card, commonly abbreviated SSC, provides the Apple ][, ][+, and //e computers with an RS-232-C serial interface for printers, modems, terminals, and other devices. It will also work in a IIgs, although the IIgs has two built-in seral ports. The SSC replaced the earlier Communications Card and Serial Interface Cards from Apple.

The Super Serial Card will work in slots 1 through 7, but is usually placed in slot 1 for use with a printer, slot 2 for use with a modem, or slot 3 for used with a teminal. These are the slot assignments expected by Apple Pascal and most other Apple II software.

A jumper block near the rear of the card is used to select whether a modem or terminal device is attached to the SSC. The triangle printed on the block should point up toward MODEM if a modem is attached, and down toward TERMINAL if a printer or remote terminal is attached. When the jumper block is set to TERMINAL, it alters the signals at the DB25 connector to provide the function of a "null modem adapter" or "modem eliminator."

Two sets of DIP switches are used to control baud rate, data format, parity, linefeeds, etc. Detailed instructions for setting these switches are in the manual. A Reference Card was included with the switch settings and commands for using the card in Communications Mode and Printer Mode.

The SSC was desigend for speeds from 50 to 19,200 bits per second, though it's been reported that 115,200 bits per second can be achieved by some cards by writing a $10 into memory location $C0AB.

Related Links : wikipedia.org - lowendmac.com

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