MECER CORPORATION
=================

   B-301 (REV. B)

   Card Type     Sound card                                       
   Chipset       ES488                                            
   Controller    
   I/O Options   CD audio in, CD-ROM interface (2), line in, line 
                 out, microphone in (2), speaker out, volume      
   Maximum DRAM  N/A                                              

<gopher://bitreich.org/I/th99/i/M-O/50892-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |     Purpose      | Location |      Purpose      | Location |
   |------------------+----------+-------------------+----------|
   | Speaker out      |    J1    | Mistumi CD-ROM    |  JP105   |
   |                  |          | interface         |          |
   |------------------+----------+-------------------+----------|
   | Microphone in    |    J2    | CD audio in       |  JP109   |
   |------------------+----------+-------------------+----------|
   | Line in          |    J3    | External control  |  JP110   |
   |                  |          | (see table below) |          |
   |------------------+----------+-------------------+----------|
   | Panasonic CD-ROM |    J7    | Sound output      |  JP112   |
   | interface        |          | (left)            |          |
   |------------------+----------+-------------------+----------|
   | External         |  JP101   | Volume            |    VR    |
   | microphone in    |          |                   |          |
   |------------------+----------+-------------------+----------|
   | Sound output     |  JP102   |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             EXTERNAL CONTROL CONNECTION/ JP110             |
   |------------------------------------------------------------|
   |            Purpose            |          Location          |
   |-------------------------------+----------------------------|
   | Active low/read, port 201h    |           Pin 1            |
   |-------------------------------+----------------------------|
   | External microphone in        |           Pin 2            |
   |-------------------------------+----------------------------|
   | Active low/write, port 201h   |           Pin 3            |
   |-------------------------------+----------------------------|
   | FM output                     |           Pin 4            |
   |-------------------------------+----------------------------|
   | Sound out (left)              |           Pin 5            |
   |-------------------------------+----------------------------|
   | Ground                        |           Pin 6            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    INTERRUPT SELECTION                     |
   |------------------------------------------------------------|
   |            IRQ             |              JP1              |
   |----------------------------+-------------------------------|
   |>> |           7            |       Pins 1 & 2 closed       |
   |---+------------------------+-------------------------------|
   |   |           2            |       Pins 7 & 8 closed       |
   |---+------------------------+-------------------------------|
   |   |           3            |       Pins 5 & 6 closed       |
   |---+------------------------+-------------------------------|
   |   |           5            |       Pins 3 & 4 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 BASE I/O ADDRESS SELECTION                 |
   |------------------------------------------------------------|
   |          Address           |              JP4              |
   |----------------------------+-------------------------------|
   |>> |          220h          |   Pins 3 & 7, 4 & 8 closed    |
   |---+------------------------+-------------------------------|
   |   |          240h          |   Pins 1 & 5, 2 & 6 closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       DMA SELECTION                        |
   |------------------------------------------------------------|
   |     Channel      |        JP2         |        JP3         |
   |------------------+--------------------+--------------------|
   |>>  |      1      | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
   |----+-------------+--------------------+--------------------|
   |    |      3      | Pins 3 & 4 closed  | Pins 3 & 4 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CD ROM TYPE SELECTION                    |
   |------------------------------------------------------------|
   |           Type             |              J6               |
   |----------------------------+-------------------------------|
   |>> |       Panasonic        |       Pins 1 & 2 closed       |
   |---+------------------------+-------------------------------|
   |   |        Mitsumi         |       Pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CD-ROM CONFIGURATION                    |
   |------------------------------------------------------------|
   |            Setting              |           JCP2           |
   |---------------------------------+--------------------------|
   |>> |           Enabled           |          Closed          |
   |---+-----------------------------+--------------------------|
   |   |          Disabled           |           Open           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CD ROM ADDRESS SELECTION                  |
   |------------------------------------------------------------|
   |            Address             |           JCP1            |
   |--------------------------------+---------------------------|
   |>>    |          300h           |          Closed           |
   |------+-------------------------+---------------------------|
   |      |          340h           |           Open            |
   +------------------------------------------------------------+