S100 Computers

Home S-100 Boards History New Boards Software Boards For Sale
Forum Other Web Sites News Index    
PMMI  Bell 212A  Modem
This was the next generation modem supplied by PMMI after their successful MM-103 modem.

PMMI 212A Modem

The PMMI Bel 212A was IEEE-696 compatible. It had auto answer and auto dial capability and ran at two different rates. 45.5-300 baud and at 1200 baud. It had full and half duplex capability.  As with the MM-103 it utilized four consecutive IO ports on the bus.  It could also be setup to utilize the interrupt lines .

As for other PNMI and Hayes boards, while some simple software was provided with the board. The vast majority utilized public domain CP/M programs like Modem 5 or 7 with this board.

I do not yet have a manual for this board.  If you have one please let me know.
The PMMI brochure can be obtained here.

Note on Bell 212 A Protocol
Bell 212A: Synchronous/ asynchronous data transmission, full-duplex operation over 2-wire leased or dialup lines; 1200-bps data rate. This versatile standard provides for efficient full-duplex operation over 2-wire dialup lines. If you add a leased line, however, you can still use Bell 212A. Comparable to ITU V.22


Other PMMI  S-100 Boards
MM-103 Modem    Bell 212A Modem     VT1 Modem


This page was last modified on 10/25/2013