88-2SIOR1

88-2SIO Drop-In Replacement Board

A redesigned drop-in replacement for the Altair 88-2SIO serial interface board
  • Two serial ports that are software and hardware compatible with the MITS 88-2SIO
  • Baud rates up for 76.8K for faster data transfers – works great with Serial CP/M
  • Connectors for DTE and DCE communications with standard IDC ribbon cables – no more breakout boxes or null-modem cables
  • Mirror RTS signal on DTR without a breakout box or special cable
  • Send and receive without having to connect CTS and DCD input signals
  • TXD and RXD status LEDs
  • All settings are easily configured with switches instead of the confusing maze of wiring options on the original 88-2SIO
88-2SIOR1

The Details...

The serial ports are designed around the Motorola 68B50 ACIA. The data rate for each serial port is set by a DIP switch, allowing communication from 110 baud through 76.8K baud. For comparison, the original 88-2SIO has a maximum baud rate of 9600 baud.

The serial ports on the 88-2SIOR1 are RS-232 only. They do not support Teletype (20 mA current loop) or TTL communication.
The 88-2SIOR1 has DTE and DCE 10-pin IDC headers for each serial port that allows use of an off-the-shelf DE-9 and DB-25 ribbon cable assemblies.

Ordering Information

The 88-2SIOJP is designed and sold by Deltec Enterprises. The board comes fully-assembled with one DE-9 female cable.

The price is $135 including shipping to a US address. To purchase, contact Deltec Enterprises by email at 2sio followed by ASCII 0x40 followed by mitsaltair.com.

For more information, see the "Resources" section at the bottom of this page.

Resources

Links to Manuals, Software, and More

Mobirise
Telephone

(972) 429-0947
Mike Douglas

Email

deramp5113 followed by ASCII 0x40 followed by the Yahoo domain name.

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