ZENITH DATA SYSTEMS
===================

   Z-248/12

   Processor              80286                                   
   Processor Speed        12MHz                                   
   Chip Set               Unidentified                            
   Video Chip Set         None                                    
   Maximum Onboard Memory 6MB                                     
   Maximum Video Memory   None                                    
   Cache                  None                                    
   BIOS                   Unidentified                            
   Dimensions             355mm x 304mm                           
   I/O Options            None                                    
   NPU Options            80287                                   

<gopher://bitreich.org/I/th99/m/U-Z/34127-1.png>
   

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Label |   Position   |
   |-------------------------------------+-------+--------------|
   |>> | Factory configured - do not     | J101  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | NPU clock mode select /3        | J103  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | NPU clock mode select direct    | J103  |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | J106  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | J113  |  Pins 1 & 2  |
   |   | alter                           |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Speaker enabled                 | J114  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | Speaker disabled                | J114  |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | Chip at U-169 is Poach 7        | J115  |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | Chip at U-169 is Poach 1        | J115  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | J116  |  Pins 2 & 3  |
   |   | alter                           |       |    closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0     |    Bank 1     |    Bank 2     |
   |------------+---------------+---------------+---------------|
   |    1MB     | (2) 256K x 9  | (2) 256K x 9  |     None      |
   |------------+---------------+---------------+---------------|
   |    3MB     | (2) 256K x 9  | (2) 256K x 9  |  (2) 1M x 9   |
   |------------+---------------+---------------+---------------|
   |    6MB     |  (2) 1M x 9   |  (2) 1M x 9   |  (2) 1M x 9   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   |            Size            |             J102              |
   |----------------------------+-------------------------------|
   |            1MB             |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |            3MB             |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |            6MB             |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    NPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |       Speed       |       Type       |        P113         |
   |-------------------+------------------+---------------------|
   |       6MHz        |      80287       | Pins 13 & 14 closed |
   |-------------------+------------------+---------------------|
   |       8MHz        |      80C87       | Pins 13 & 14 closed |
   |-------------------+------------------+---------------------|
   |       8MHz        |      80287       |  Pins 7 & 8 closed  |
   |-------------------+------------------+---------------------|
   |       12MHz       |      80C87       |  Pins 7 & 8 closed  |
   +------------------------------------------------------------+