
UNITRON COMPUTER, INC.

3/486 MAINBOARD

Processor     80386DX/CX486DLC/80486SX/80486DX/ODP486SX/80486DX2
Processor     25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set      UMC
Max. Onboard  32MB
DRAM
SRAM Cache    32/64/128/256KB
BIOS          AMI/Phoenix
Dimensions    230mm x 218mm
I/O Options   32-bit proprietary local bus slot, 32-bit VESA local bus slot
NPU Options   80387DX/CX487DLC

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  External battery            J1       Speaker                    J29

  Turbo LED                  J25       Power LED & keylock        J30

  Reset switch               J26       32-bit local bus slot       S1

  Turbo switch               J28       32-bit VESA local bus       S2
                                       slot

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color                J6            pins 2 & 3
                                                              closed

      Monitor type select monochrome           J6            pins 1 & 2
                                                              closed

     Parity enabled                           J9            pins 2 & 3
                                                              closed

      Parity disabled                          J9            pins 1 & 2
                                                              closed

     Factory configured - do not alter        J21             Open

     Factory configured - do not alter        J31             Open

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      20MB        (4) 4M x 9      (4) 1M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                    SRAM CONFIGURATION

     Size          Cache         Location         TAG

     32KB        (8) 8K x 8       Bank 0       (1) 8K x8

     64KB        (8) 8K x 8    Banks 0 & 1    (1) 8K x 8

     128KB      (4) 32K x 8       Bank 0      (1) 8K x 8

     256KB      (8) 32K x 8    Banks 0 & 1    (1) 32K x 8

                         SRAM JUMPER CONFIGURATION

   Size       J7       J8      J11      J12      J13 &    J17       J18
                                                 J19

   32KB      Open    pins 2   pins 1   pins 1   pins 1   pins 1    pins 1
                      & 3      & 2      & 2      & 2      & 2       & 2

   64KB      Open    pins 1   pins 1   pins 2   pins 1   pins 1    pins 2
                      & 2      & 2      & 3      & 2      & 2       & 3

  128KB     pins 1   pins 2   pins 1   pins 2   pins 2   pins 1    pins 2
             & 2      & 3      & 2      & 3      & 3      & 2       & 3

  256KB     pins 2   pins 1   pins 2   pins 2   pins 2   pins 2    pins 2
             & 3      & 2      & 3      & 3      & 3      & 3       & 3

  Note: Pins designated should in the closed position.

                                                                         .

                          VESA MODE CONFIGURATION

       Mode              J22                J23                J24

      Master          pins 1 & 2         pins 2 & 3         pins 1 & 2
                        closed            closed             closed

      Slave           pins 2 & 3         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

  Note: VESA master mode can only be enabled when IC PAL 16R4 is
  installed.

                          CPU TYPE CONFIGURATION

     CPU Type         J10        J14        J15        J16         J20

   80386DX with     pins 1 &     N/A      pins 1 &     N/A         N/A
       NPU             2                     2

  80386DX w/o NPU   pins 1 &     N/A      pins 2 &     N/A         N/A
                       2                     3

   80486SX PQFP     pins 2 &    Open      pins 2 &   pins 2 &      Open
                       3                     3          3

   80486SX PGA      pins 2 &    Open      pins 2 &   pins 2 &    pins 2 &
                       3                     3          3           3

     80486SX        pins 2 &   pins 2 &   pins 2 &   pins 1 &    pins 1 &
                       3          3          3          2           2

  80486SX + 487SX   pins 2 &   pins 1 &   pins 2 &   pins 1 &    pins 2 &
        OD             3          2          3       2, 3 & 4       3

  80486SX + 486DX   pins 2 &   pins 1 &   pins 2 &   pins 1 &    pins 2 &
       PGA             3          2          3       2, 3 & 4       3

     80486DX        pins 2 &   pins 2 &   pins 2 &   pins 1 &    pins 2 &
                       3          3          3       2, 3 & 4       3

     80486DX2       pins 2 &   pins 2 &   pins 2 &   pins 1 &    pins 2 &
                       3          3          3       2, 3 & 4       3

                          CPU SPEED CONFIGURATION

              ICS2494 ( CPU Clock
                  Generator)

   Speed              J2                 J3           J4           J5

   25MHz       pins 1 & 2 closed      pins 2 &     pins 2 &    pins 1 & 2
                                      3 closed     3 closed      closed

   33MHz       pins 1 & 2 closed      pins 1 &     pins 2 &    pins 1 & 2
                                      2 closed     3 closed      closed

   40MHz       pins 2 & 3 closed      pins 2 &     pins 1 &    pins 1 & 2
                                      3 closed     2 closed      closed

  50iMHz       pins 1 & 2 closed      pins 2 &     pins 2 &    pins 1 & 2
                                      3 closed     3 closed      closed

   50MHz       pins 2 & 3 closed      pins 2 &     pins 2 &    pins 1 & 2
                                      3 closed     3 closed      closed

  66iMHz       pins 2 & 3 closed      pins 1 &     pins 2 &    pins 1 & 2
                                      2 closed     3 closed      closed

                          CPU SPEED CONFIGURATION

              IMISC425 ( CPU Clock
                  Generator)

   Speed              J2                 J3           J4           J5

   25MHz       pins 2 & 3 closed      pins 1 & 2  pins 1 & 2   pins 1 & 2
                                       closed       closed       closed

   33MHz       pins 1 & 2 closed      pins 2 & 3  pins 1 & 2   pins 1 & 2
                                       closed       closed       closed

   40MHz       pins 1 & 2 closed      pins 2 & 3  pins 2 & 3   pins 2 & 3
                                       closed       closed       closed

  50iMHz       pins 2 & 3 closed      pins 1 & 2  pins 1 & 2   pins 1 & 2
                                       closed       closed       closed

   50MHz       pins 2 & 3 closed      pins 1 & 2  pins 1 & 2   pins 2 & 3
                                       closed       closed       closed

  66iMHz       pins 1 & 2 closed      pins 1 & 2  pins 2 & 3   pins 2 & 3
                                       closed       closed       closed

