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