ZENITH DATA SYSTEMS

Z-157 MODEL 2/MODEL 3

Processor         8088
Processor Speed   4.77MHz
Chip Set          Unidentified
Max. Onboard DRAM 640KB
Cache             None
BIOS              Unidentified
Dimensions        254mm x 218mm
I/O Options       Parallel port/keyboard slot
NPU Options       8087

[Image]

                                CONNECTIONS

  Purpose                                            Location

  Propietary parallel port/keyboard                     S1
  slot

                        USER CONFIGURABLE SETTINGS

                Function                     Switch          Position

  »   RAM parity checking enabled            SW1/2              On

      RAM parity checking disabled           SW1/2             Off

  »   RAM over 256KB on mother board         SW1/3              On

      RAM over 256KB on external             SW1/3             Off
      memory card

  »   Parallel port enabled                  SW1/6              On

      Parallel port disabled                 SW1/6             Off

  »   Floppy controller enabled              SW1/7              On

      Floppy controller disabled             SW1/7             Off

                DRAM CONFIGURATION

    Size        Bank 0       Bank 1      Bank 2

    512KB     (9) 41256    (9) 41256      NONE

    640KB     (9) 41256    (9) 41256    (9) 4164

                         BOOT CONFIGURATION

        Setting                SW1/0                  SW1/1

  MFM-150 Monitor RAM           Off                    Off

  MFM-150 Monitor RAM            On                     On

      Floppy disk               Off                     On

      Hard Drive                 On                    Off

          MONITOR CONFIGURATION

   Setting        SW1/4        SW1/5

  Monochrome       Off          Off

     CGA           On           Off

     EGA           On            On

        MISCELLANEOUS TECHNICAL NOTE

  Note: Position 1 on SW1 is unidentified.