LASER COMPUTER, INC.

LASER 486 MODULAR EISA

Processor       80486SX/80487SX/80486DX/80486DX2
Processor Speed 16/20/25/33/50(internal)/66(internal)MHz
Chip Set        Unidentified
Max. Onboard    96MB (with two memory cards installed)
DRAM
Cache           64/128KB
BIOS            Unidentified
Dimensions      330mm x 220mm
I/O Options     External memory cards (2), external CPU card, PS/2 mouse
                port
NPU Options     4167

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  PS/2 mouse connector        J7       Diagnostic connector       J32

  Speaker                     J9       External memory cards    SL1 & SL2

  Front panel connector      J10       External CPU card          SL3

  External battery           J12

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   EISA bus controller speed select        JP1             Closed
      25MHz

      EISA bus controller speed select        JP1              Open
      33MHz

  »   BIOS type select 27512                  JP2             Closed

      BIOS type select 27010                  JP2              Open

  »   Battery type select internal            JP3           pins 2 & 3
                                                              closed

      Battery type select external            JP3           pins 1 & 2
                                                              closed

  »   Real time clock select MC146818A        JP4             Closed

      Real time clock select MC146818         JP4              Open
      or HD146818

  »   Parity check enabled                    JP5             Closed

      Parity check disabled                   JP5              Open

[Image]

                      DRAM CONFIGURATION

      Size          Bank 0          Bank 1          Bank 2

      1MB        (4) 256K x 9        NONE            NONE

      2MB        (4) 256K x 9    (4) 256K x 9        NONE

      3MB        (4) 256K x 9    (4) 256K x 9    (4) 256K x 9

      4MB         (4) 1M x 9         NONE            NONE

      5MB        (4) 256K x 9     (4) 1M x 9         NONE

      8MB         (4) 1M x 9      (4) 1M x 9         NONE

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

      12MB        (4) 1M x 9      (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE            NONE

      16MB        (4) 4M x 9         NONE            NONE

      17MB       (4) 256K x 9     (4) 4M x 9         NONE

      20MB        (4) 1M x 9      (4) 4M x 9         NONE

      20MB        (4) 4M x 9      (4) 1M x 9         NONE

      24MB        (4) 4M x 9      (4) 1M x 9      (4) 1M x 9

      32MB        (4) 4M x 9      (4) 4M x 9         NONE

                  DRAM CONFIGURATION (CON’T)

      Size          Bank 0          Bank 1          Bank 2

      33MB       (4) 256K x 9     (4) 4M x 9      (4) 4M x 9

      36MB        (4) 1M x 9      (4) 4M x 9      (4) 4M x 9

      48MB        (4) 4M x 9      (4) 4M x 9      (4) 4M x 9

  Note: In order to have 96MB, use two memory cards.

[Image]

               CONNECTIONS

       Purpose             Location

  Chassis fan power           J2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Factory configured - do not             JP2              N/A
      alter

                      CACHE CONFIGURATION

        Size                Bank 0               Bank 1

        64KB              (4) 8K x 8           (4) 8K x 8

        128KB            (4) 32K x 8              NONE

  Note: The orientation of the cache banks are unidentified.

                        CPU TYPE CONFIGURATION

               Type                               JP1

              80486SX                      pins 5 & 6 closed

              80487SX               pins 2 & 3, 4 & 5, 6 & 7 closed

              80486DX               pins 1 & 2, 4 & 5, 6 & 7 closed

             80486DX2               pins 1 & 2, 4 & 5, 6 & 7 closed

         CPU SPEED CONFIGURATION

  Speed      JP3        JP4       JP5

  16MHz     Closed    Closed    Closed

  20MHz     Closed    Closed     Open

  25MHz     Closed     Open     Closed

  33MHz     Closed     Open      Open

  50iMHz    Closed     Open     Closed

  66iMHz    Closed     Open      Open