
ZENITH DATA SYSTEMS

Z-2500 SERIES

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             330mm x 218mm
I/O Options            None
NPU Options            80287

[Image]

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not          J101              Open
      alter

     NPU clock mode select mode /3        J103             Closed
      for 80287, /2 for 80C287

      NPU clock mode select direct         J103              Open
      mode

      Parallel printer decode              J106          Unidentified

     ROM DMA blocked                      J113        Pins 1 & 2 closed

      ROM DMA not blocked                  J113        Pins 2 & 3 closed

     Speaker enabled                      J114             Closed

      Speaker disabled                     J114              Open

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       None

      3MB         (4) 256K x 9    (2) 1M x 9

      6MB         (4) 1M x 9      (2) 1M x 9

               DRAM TYPE SELECTION

          Type                     J102

   256K x 9 in Bank 0       Pins 2 & 3 closed

  1M x 9 in Banks 0 & 1     Pins 1 & 2 closed

                            SCP SPEED SELECTION

                 Speed                                 P113

                  7.16MHz                       Pins 1 & 2 closed

                   8MHz                        Pins 5 & 6 closed

                   12MHz                        Pins 3 & 4 closed

                            NPU SPEED SELECTION

     Clock speed           80287            80C287             P113

           8MHz            2.7MHz            4MHz           Pins 9 & 10
                                                              closed

         16MHz            5.3MHz            8MHz          Pins 13 & 14
                                                              closed

          24MHz             8MHz             12Hz           Pins 7 & 8
                                                              closed

  Note: See also J103 setting.

                              POACH SELECTION

            Setting                     J115                  J116

       POACH 1 chip installed    Pins 2 & 3 closed    Pins 2 & 3 closed
               in U169

        POACH 7 chip installed    Pins 1 & 2 closed    Pins 1 & 2 closed
               in U169


