
COMMODORE BUSINESS MACHINES, INC.

386DX System (Part #368954-01)

Processor               80386DX
Processor Speed         25/33MHz
Chip Set                PC CHIPS
Max. Onboard DRAM       32MB
SRAM Cache              64/128/256KB
BIOS                    AMI
Dimensions              330mm x 218mm
I/O Options             Floppy drive interface, IDE interface, parallel
                        port, PS/2 mouse port, serial port (2), VGA port
NPU Options             80387/3167

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                  Location

  VGA port                 C1         PS/2 style mouse            C5
                                      port

  Serial port 1            C2         Floppy drive                C6
                                      interface

  Serial port 2            C3         Hard drivve                 C7
                                      interface

  Parallel port            C4         Basic connectors            C8
                                      (pins unknown)

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Combined BIOS enabled                    J7             closed

      Combined BIOS disabled                   J7              open

     Monitor type select color                J14           pins 1 & 2
                                                              closed
                                               J20
                                                             pins 2 & 3
                                                              closed

      Monitor type select color                J14           pins 2 & 3
      disabled                                                closed
                                               J20
                                                             pins 1 & 2
                                                              closed

     Factory configured - do not alter        J17            unknown

     Factory configured - do not alter        J18            unknown

     Factory configured - do not alter        J19            unknown

     Factory configured - do not alter        J31            unknown

     VGA select zero wait states              J23            closed

      VGA select zero wait states              J23             open
      disabled

     Monitor type select monochrome           J30             open

      Monitor type select monochrome           J30            closed
      disabled

     Floppy drive interface (C6)              J41           pins 1 & 2
      enabled                                                 closed

     Floppy drive interface (C6)              J41           pins 2 & 3
      disabled                                                closed

     Hard drive interface (C7) enabled        J43            closed

                                               J44            closed

      Hard drive interface (C7)                J43             open
      disabled
                                               J44             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

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

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

      16MB        (4) 4M x 9         NONE

      17MB        (4) 256K x 9    (4) 4M x 9

      17MB        (4) 4M x 9     (4) 256K x 9

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

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

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

                         SERIAL PORT CONFIGURATION

                Function                     Jumper          Position

     Serial port 1 (C2) enabled at           J27             closed
      interrupt IRQ4

      Serial port 1 (C2) disabled             J27              open

     Serial port 2 (C3) enabled at           J29             closed
      interrupt select IRQ3

      Serial port 2 (C3) disabled             J29              open

                                              J38           pins 1 & 2
                                                              closed
      Serial port 1 (C2) select COM1          J39
                                                            pins 1 & 2
                                              J40             closed

                                                            pins 1 & 2
                                                              closed

                                              J38           pins 1 & 2
                                                              closed
      Serial port 2 (C3) select COM2          J39
                                                            pins 1 & 2
                                              J40             closed

                                                            pins 1 & 2
                                                              closed

                                              J38           pins 1 & 2
                                                              closed
      Serial port 1 (C2) select COM2          J39
                                                            pins 1 & 2
                                              J40             closed

                                                            pins 2 & 3
                                                              closed

                                              J38           pins 1 & 2
                                                              closed
      Serial port 1 (C2) select COM1          J39
                                                            pins 1 & 2
                                              J40             closed

                                                            pins 2 & 3
                                                              closed

                                              J38           pins 2 & 3
                                                              closed
      Serial port 1 (C2) select COM1          J39
                                                            pins 1 & 2
                                              J40             closed

                                                            pins 1 & 2
                                                              closed

                                              J38           pins 2 & 3
                                                              closed
      Serial port 2 (C3) disabled             J39
                                                            pins 1 & 2
                                              J40             closed

                                                            pins 1 & 2
                                                              closed

                                              J38           pins 1 & 2
                                                              closed
      Serial port 1 (C2) disabled             J39
                                                            pins 2 & 3
                                              J40             closed

                                                            pins 2 & 3
                                                              closed

                                              J38           pins 1 & 2
                                                              closed
      Serial port 2 (C3) select COM1          J39
                                                            pins 2 & 3
                                              J40             closed

                                                            pins 2 & 3
                                                              closed

                                              J38           pins 1 & 2
                                                              closed
      Serial port 1 (C2) disabled             J39
                                                            pins 2 & 3
                                              J40             closed

                                                            pins 1 & 2
                                                              closed

                                              J38           pins 1 & 2
                                                              closed
      Serial port 2 (C3) select COM2          J39
                                                            pins 2 & 3
                                              J40             closed

                                                            pins 1 & 2
                                                              closed

                                              J38           pins 2 & 3
                                                              closed
      Serial port 1 (C2) select COM2          J39
                                                            pins 1 & 2
                                              J40             closed

                                                            pins 2 & 3
                                                              closed

                                              J38           pins 2 & 3
                                                              closed
      Serial port 2 (C3) disabled             J39
                                                            pins 1 & 2
                                              J40             closed

                                                            pins 2 & 3
                                                              closed

                                              J38           pins 2 & 3
                                                              closed
      Serial port 1 & 2 disabled              J39
                                                            pins 2 & 3
                                              J40             closed

                                                            pins 2 & 3
                                                              closed

                     PARALLEL PORT CONFIGURATION (C4)

                Function                    Jumper           Position

     Parallel port enabled at IRQ7           J28           pins 2 & 3
                                                              closed

      Parallel port enabled at IRQ5           J28           pins 1 & 2
                                                              closed

      Parallel port enable LPT1               J36           pins 2 & 3
                                                              closed
                                              J37
                                                            pins 1 & 2
                                                              closed

      Parallel port enable LPT2               J36           pins 1 & 2
                                                              closed
                                              J37
                                                            pins 1 & 2
                                                              closed

      Parallel port enable LPT3               J36           pins 1 & 2
                                                              closed
                                              J37
                                                            pins 2 & 3
                                                              closed

      Parallel port disabled                  J36           pins 2 & 3
                                                              closed
                                              J37
                                                            pins 2 & 3
                                                              closed

                               SRAM JUMPER CONFIGURATION

   Size      Jumper   Jumper    Jumper    Jumper    Jumper   Jumper   Jumper    Jumper
              J8       J9        J11       J12       J13      J15      J16       J42

  Disabled   closed   pins 1    pins 1     N/A       N/A     open      N/A       N/A
                       & 2       & 2
                     closed    closed

   64KB      closed   pins 2    pins 2    pins 1    pins 1   closed   pins 2    pins 1
                       & 3       & 3       & 2       & 2                & 3       & 2
                     closed    closed    closed    closed             closed    closed

   128KB     closed   pins 2    pins 2    pins 2    pins 1   closed    open     pins 2
                       & 3       & 3       & 3       & 2                          & 3
                     closed    closed    closed    closed                       closed

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

                            SRAM CONFIGURATION

     Size        Cache SRAM      Location      TAG (UAA)      TAG (U11)

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

     128KB      (4) 32K x 8       Bank 0      (1) 32K x 8       NONE

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

                     VIDEO SWITCH CONFIGURATION (SW1)

         Mode           switch     switch    switch    switch    switch 5
                          1          2         3         4

     56Hz vertical       open      open       N/A       N/A        N/A
       refresh

     60Hz vertical       open     closed      N/A       N/A        N/A
       refresh

     72Hz vertical      closed     open       N/A       N/A        N/A
       refresh

  Enable interlaced      N/A        N/A       open      open       N/A

  60Hz non-interlaced    N/A        N/A       open     closed      N/A

  72Hz non-interlaced    N/A        N/A      closed     open       N/A

  31.5KHz horizontal     N/A        N/A       N/A       N/A        open
      scan rate

   40KHz horizontal      N/A        N/A       N/A       N/A       closed
      scan rate

              VRAM CONFIGURATION

      Size           VRAM        SW1/switch 6

     512KB        (2) 256K x 4      closed

      1MB         (4) 256K x 4       open

