
LEADING TECHNOLOGY

5500AT

Processor            80286 (Exact location is unknown)
Processor Speed      8/10/12/16/20/25MHz
Chip Set             SIS
Max. Onboard DRAM    5MB
Cache                None
BIOS                 AMI
Dimensions           330mm x 218mm
I/O Options          Floppy drive interface, IDE interface, Joystick port,
                     parallel port,
NPU Options          80287

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Parallel port               CN1      IDE interface               J10

  Joystick port               CN2      Floppy drive interface      J12

  Serial port 2 (25 pin)      CN3      Speaker                     J15

  Serial port 1 (9 pin)       CN4      IDE interface LED           J29

  Function panel              J4       Riser Card                  S1
  connector

  External battery            J9

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch        Position

     Joystick port enabled                  J17              closed

      Joystick port disabled                 J17               open

     IDE interface enabled                  J28               open

      IDE interface disabled                 J28              closed

     Floppy drive interface                 J33              closed
      enabled

      Floppy drive interface                 J33               open
      disabled

     Parity enabled                         J34              closed

      Parity disabled                        J34               open

                      DRAM CONFIGURATION

      Size          Bank 0          Bank 1          Bank 2

      1MB         (8) 441100         NONE            NONE

      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

                         SERIAL PORT CONFIGURATION

  Port 1 (CN4)      Port 2       J20        J22        J25         J26
                    (CN2)

       COM1         COM2      pins 2 &   pins 1 &     Open       Open
                                  3          2

        COM1         COM3      pins 2 &     Open     pins 1 &     Open
                                  3                     2

        COM1         COM4      pins 2 &     Open       Open      pins 1 &
                                  3                                 2

        COM2         COM1      pins 1 &   pins 2 &     Open       Open
                                  2          3

        COM2         COM3        Open     pins 2 &   pins 1 &     Open
                                             3          2

        COM2         COM4        Open     pins 2 &     Open      pins 1 &
                                             3                      2

        COM3         COM1      pins 1 &     Open     pins 2 &     Open
                                  2                     3

        COM3         COM2        Open     pins 1 &   pins 2 &     Open
                                             2          3

        COM3         COM4        Open       Open     pins 2 &    pins 1 &
                                                        3           2

        COM4         COM1      pins 2 &     Open       Open      pins 1 &
                                  3                                 2

        COM4         COM2        Open     pins 1 &     Open      pins 2 &
                                             2                      3

        COM4         COM3        Open       Open     pins 1 &    pins 2 &
                                                        2           3

            Note:Pins designated should be in the closed position.

                       SERIAL PORT IRQ CONFIGURATION

    Port 1 (CN1)       Port 2 (CN2)          J18               J19

         IRQ4             IRQ3           pins 2 & 3        pins 1 & 2
                                           closed             closed

          IRQ3             IRQ4           pins 1 & 2        pins 2 & 3
                                           closed             closed

                        PARALLEL PORT CONFIGURATION

        LPT              IRQ              J16                 J21

          1              7            pins 2 & 3      pins 2 & 3 closed
                                         closed

           1              5            pins 2 & 3      pins 1 & 2 closed
                                         closed

           2              7            pins 1 & 2      pins 2 & 3 closed
                                         closed

           2              5            pins 1 & 2      pins 1 & 2 closed
                                         closed

