
COMMODORE BUSINESS MACHINES, INC.

386SX

Processor               80386SX
Processor Speed         16/20/25MHz
Chip Set                Unknown
Max. Onboard DRAM       16MB
Cache                   None
BIOS                    Commodore
Dimensions              254mm x 218mm
I/O Options             16-bit riser card slot, bus mouse port, floppy
                        drive interface, game port, IDE interface,
                        parallel port, serial ports (2), VGA interface
NPU Options             80387SX

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  16-bit riser card           CN1      Turbo LED                   J3

  VGA port                    CN2      Turbo switch                J4

  Serial port 2               CN3      Reset switch                J5

  Serial port 1               CN4      IDE interface               J9

  Parallel port               CN5      Floppy drive interface      J10

  Bus mouse port              CN6      Game port                   J12

  Power LED & keylock         J1       External battery            J15

  IDE interface LED           J2

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color                J6             Closed

      Monitor type select monochrome           J6              Open

     IDE interface enabled                 J7 and J8         Closed

      IDE interface disabled                J7 and J8          Open

     Battery type select internal             J14           pins 1 & 2
                                                              closed

      Battery type select external             J14           pins 2 & 3
                                                              closed

     VGA port wait states select one          J16             Open

      VGA port wait states select zero         J16            Closed

     VGA port enabled                         J17            Closed

      VGA port disabled                        J17             Open

     Floppy interface enabled                 J23           pins 1 & 2
                                                              closed

      Floppy interface disabled                J23           pins 2 & 3
                                                              closed

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1        Bank 2         Bank 3

      1MB        (2) 256K x     (2) 256K x       NONE           NONE
                     9              9

     1.5MB       (2) 256K x     (2) 256K x     (2) 256K x       NONE
                     9              9              9

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

      2MB        (2) 1M x 9        NONE          NONE           NONE

      3MB        (2) 256K x     (2) 256K x    (2) 1M x 9        NONE
                     9              9

      4MB        (2) 1M x 9     (2) 1M x 9       NONE           NONE

      5MB        (2) 256K x     (2) 256K x    (2) 1M x 9     (2) 1M x 9
                     9              9

      6MB        (2) 1M x 9     (2) 1M x 9    (2) 1M x 9        NONE

      8MB        (2) 1M x 9     (2) 1M x 9    (2) 1M x 9     (2) 1M x 9

     12MB        (2) 1M x 9     (2) 1M x 9    (2) 4M x 9        NONE

     16MB        (2) 4M x 9     (2) 4M x 9       NONE           NONE

                        PARALLEL PORT CONFIGURATION

  Parallel port      IRQ          J13             J18            J19

       LPT1           5        pins 3 & 4        Open          Closed
                                 closed

       LPT1           7        pins 1 & 2        Open          Closed
                                 closed

       LPT2           5        pins 3 & 4       Closed         Closed
                                 closed

       LPT2           7        pins 1 & 2       Closed         Closed
                                 closed

       LPT3           5        pins 3 & 4       Closed          Open
                                 closed

       LPT3           7        pins 1 & 2       Closed          Open
                                 closed

     Disabled        N/A          N/A            Open           Open

                         SERIAL PORT CONFIGURATION

     UART1          UART2           J20           J21            J22

     COM1            COM2        pins 1 & 2    pins 1 & 2     pins 1 & 2
                                  closed         closed         closed

     COM1          Disabled      pins 1 & 2    pins 2 & 3     pins 1 & 2
                                  closed         closed         closed

     COM2            COM1        pins 1 & 2    pins 1 & 2     pins 2 & 3
                                  closed         closed         closed

   Disabled          COM1        pins 2 & 3    pins 1 & 2     pins 2 & 3
                                  closed         closed         closed

   Disabled          COM2        pins 2 & 3    pins 1 & 2     pins 1 & 2
                                  closed         closed         closed

     COM2          Disabled      pins 1 & 2    pins 2 & 3     pins 2 & 3
                                  closed         closed         closed

   Disabled        Disabled      pins 2 & 3    pins 2 & 3        N/A
                                  closed         closed

