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# COMMODORE BUSINESS MACHINES, INC.
386DX System (Part #368954-01)
Processor 80386DX
Processor Speed 25/33MHz
Chip Set PC CHIPS
Max. Onboard 32MB
DRAM
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
(IMG) IMG 1
+------------------------------------------------------------+
| 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 | J17 | unknown |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J18 | unknown |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J19 | unknown |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J31 | unknown |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | 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) | J43 | closed |
| | enabled | | |
| | | 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) 8K x 8 | (1) 8K x 8 |
| | | 1 | | |
|-------+-------------+------------+------------+------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 32K x | NONE |
| | | | 8 | |
|-------+-------------+------------+------------+------------|
| 256KB | (8) 32K x 8 | Banks 0 & | (1) 32K x | (1) 32K x |
| | | 1 | 8 | 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO SWITCH CONFIGURATION (SW1) |
|------------------------------------------------------------|
| Mode |switch 1|switch 2|switch 3|switch 4|switch |
| | | | | | 5 |
|----------------+--------+--------+--------+--------+-------|
| 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 | N/A | N/A | open | open | N/A |
| interlaced | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 60Hz | N/A | N/A | open | closed | N/A |
| non-interlaced | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 72Hz | N/A | N/A | closed | open | N/A |
| non-interlaced | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 31.5KHz | N/A | N/A | N/A | N/A | open |
|horizontal 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 |
+------------------------------------------------------------+