MICRO EQUIPMENT CORPORATION
===========================

   UN-451

   Card Type          Multi I/O card                              
   Chipset/Controller Unknown                                     
   I/O Options        Game port, parallel port, serial ports (2)  
   Maximum DRAM       N/A                                         

<gopher://bitreich.org/I/th99/i/M-O/50489-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |    Purpose    | Location |       Purpose        | Location |
   |---------------+----------+----------------------+----------|
   | Parallel port |   CN1    |    Serial port 1     |  ASYN1   |
   |---------------+----------+----------------------+----------|
   |   Game port   |   CN2    |    Serial port 2     |  ASYN2   |
   |               |          |      (optional)      |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                PARALLEL PORT CONFIGURATION                 |
   |------------------------------------------------------------|
   |    LPT/Address/IRQ     |                JP1                |
   |------------------------+-----------------------------------|
   |>> |   LPT1/378h/IRQ7   |      Pins 5 & 6/2 & 3 closed      |
   |---+--------------------+-----------------------------------|
   |   |   LPT2/278h/IRQ5   |      Pins 4 & 5/1 & 2 closed      |
   |---+--------------------+-----------------------------------|
   |   |      Disable       | Pins 4, 5, & 6/1, 2, & 3 all open |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            SERIAL PORT 1 (ASYN1) CONFIGURATION             |
   |------------------------------------------------------------|
   |  COM/Address/IRQ   |                  JP1                  |
   |--------------------+---------------------------------------|
   |>> | COM1/3F8h/IRQ4 |      Pins 20 & 21/10 & 11 closed      |
   |---+----------------+---------------------------------------|
   |   | COM2/2F8h/IRQ3 |      Pins 16 & 17/11 & 12 closed      |
   |---+----------------+---------------------------------------|
   |   | COM4/2E8h/IRQ3 |      Pins 19 & 20/11 & 12 closed      |
   |---+----------------+---------------------------------------|
   |   |    Disable     |  Pins 16 & 17/19, 20, & 21/10, 11, &  |
   |   |                |              12 all open              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            SERIAL PORT 2 (ASYN2) CONFIGURATION             |
   |------------------------------------------------------------|
   |  COM/Address/IRQ   |                  JP1                  |
   |--------------------+---------------------------------------|
   |>> | COM2/2F8h/IRQ3 |       Pins 17 & 18/8 & 9 closed       |
   |---+----------------+---------------------------------------|
   |   | COM3/3E8h/IRQ4 |       Pins 13 & 14/7 & 8 closed       |
   |---+----------------+---------------------------------------|
   |   | COM4/2E8h/IRQ3 |       Pins 14 & 15/8 & 9 closed       |
   |---+----------------+---------------------------------------|
   |   |    Disable     |  Pins 17 & 18/13, 14, & 15/7, 8, & 9  |
   |   |                |               all open                |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |  Serial port 2 (ASYN2) exists only on model UN451b. Model  |
   |              UN-451a has only one serial port              |
   |------------------------------------------------------------|
   |   The pin numbers for JP1 printed on the actual card are   |
   |  incorrect. Use the numbers depicted on the above diagram  |
   |                 to re-configure the card.                  |
   |------------------------------------------------------------|
   |   The game port can be disabled by cutting a wire on the   |
   |  soldering side of the card. It is located near the edge   |
   |   opposite of the external ports and toward the center.    |
   +------------------------------------------------------------+