AST RESEARCH, INC.

PREMIUM SE 486/50 (MODEL 202377-002)

Processor               80486DX (on external CPU/Memory module)
Processor Speed         50MHz
Chip Set                AST
Max. Onboard DRAM       None (32MB on external CPU/Memory module)
Cache                   None (256KB on external CPU/Memory module)
BIOS                    AST
Dimensions              355mm x 266mm
I/O Options             32-bit external CPU/Memory module slot

                        32-bit external Memory module slot (2)

                        bus mouse port, floppy drive interface

                        IDE interface, parallel port, serial port (2)
NPU Options             None

[Image]

                                CONNECTIONS

  Purpose                Location     Purpose                  Location

  Bus mouse port           CN1        External battery           P14

  Speaker                  J12        Serial port 1 (COM1)       P17

  Parallel port            J19        Serial port 2 (COM2)       P18

  Floppy drive             J20        32-bit external             S1
  interface (A: and                   CPU/Memory module
  B:)

  Third floppy drive       J21        32-bit external          S2 & S3
  interface                           Memory module slots

  IDE interface            J22        Optional ROM (even)         U7

  IDE interface LED        J23        Optional ROM (odd)          U8

  Front panel              P11
  switches & LEDs

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not alter        E1              open

  »   Password check enabled                   E2            pins 2 & 3
                                                              closed

      Password check disabled                  E2            pins 1 & 2
                                                              closed

  »   Factory configured - do not alter        E3              open

  »   Factory configured - do not alter        E4             closed

  »   Factory configured - do not alter        E5             closed

  »   Factory configured - do not alter        E6              open

[Image]

              CONNECTIONS

  Purpose                    Location

  Reserved for future use       EXP

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

  »   Parity check enabled                    E1              closed

      Parity check disabled                   E1               open

  »   Cache enabled                           E2              closed

      Cache disabled                          E2               open

  Note:AST CPU/Memory module part number is 202465-005.

                            DRAM CONFIGURATION

           Size                                Bank 0

           16MB                              (4) 4M x 9

           32MB                              (4) 8M x 9

  Notes:256KB of SRAM Cache is included as a module on the CPU/Memory
  module.

  384KB of DRAM is reserved for System and VGA BIOS shadowing and cannot
  be disabled.

  Up to two of the following memory boards may be installed in addition
  to the CPU/Memory

  module: AST part numbers 202275-004, 202275-006, 202387-001, 202387-004

  or 202387-005.