TEXT View Source
# UNITRON COMPUTER, INC.
486SX SYSTEM
Processor 80486SX/80486DX
Processor Speed 25/33MHz
Chip Set UMC
Max. Onboard 32MB
DRAM
SRAM Cache 32/128KB
BIOS Phoenix
Dimensions 346mm x 218mm
I/O Options Floppy drive interface, game port, IDE
interface, modem interface, parallel port,
serial port (2), VGA port
NPU Options 4167 (location unverified)
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Game port | C1 | IDE interface | J22 |
|---------------+----------+----------------------+----------|
| VGA port | C2 | Modem interface | J23 |
|---------------+----------+----------------------+----------|
| Parallel port | C3 | Turbo LED | J26 |
|---------------+----------+----------------------+----------|
| Serial port 2 | C4 | Power LED | J28 |
|---------------+----------+----------------------+----------|
| Serial port 1 | C5 | Floppy drive | J31 |
| | | interface | |
|---------------+----------+----------------------+----------|
| Fan power | J3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Serial port 1 (CN5) enabled | J18 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Serial port 1 (CN5) disabled | J18 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Serial port 1 (CN5) select COM1 | J19 | pins 1 & 2 |
| | (I/O address 3F8-3FFh) | | closed |
|---+----------------------------------+--------+------------|
| | Serial port 1 (CN5) select COM3 | J19 | pins 2 & 3 |
| | (I/O address 3E8-3EFh) | | closed |
|---+----------------------------------+--------+------------|
| » | Parallel port (C3) select LPT1 | J20 | pins 1 & 2 |
| | interrupt IRQ7 at 378-37F | | closed |
|---+----------------------------------+--------+------------|
| | Parallel port (C3) select LPT2 | J20 | pins 2 & 3 |
| | interrupt IRQ5 at 278-27F | | closed |
|---+----------------------------------+--------+------------|
| » | Parallel port (CN3) enabled | J21 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Parallel port (CN3) disabled | J21 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | IDE interface (J22) enabled | J25 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | IDE interface (J22) disabled | J25 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Floppy drive interface (J31) | J27 | pins 1 & 2 |
| | enabled | | closed |
|---+----------------------------------+--------+------------|
| | Floppy drive interface (J31) | J27 | pins 2 & 3 |
| | disabled | | closed |
|---+----------------------------------+--------+------------|
| » | Serial port 2 (CN4) select COM2 | J29 | pins 1 & 2 |
| | (I/O address 2F8-2FFh) | | closed |
|---+----------------------------------+--------+------------|
| | Serial port 2 (CN4) select COM4 | J29 | pins 2 & 3 |
| | (I/O address 2E8-2EFh) | | closed |
|---+----------------------------------+--------+------------|
| » | Serial port 2 (CN4) enabled | J30 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Serial port 2 (CN4) disabled | J30 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (1) 256K x 36 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (1) 256K x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 3MB | (1) 512K x 36 | (1) 256K x 36 |
|------------------+--------------------+--------------------|
| 4MB | (1) 1M x 36 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 12MB | (1) 2M x 36 | (1) 1M x 36 |
|------------------+--------------------+--------------------|
| 16MB | (1) 2M x 36 | (1) 2M x 36 |
|------------------+--------------------+--------------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU | JP1 | JP2 |
|----------+-------------------+-----------------------------|
| 80486DX | pins 1 & 2 closed | pins 1 & 2 and 3 & 4 closed |
|----------+-------------------+-----------------------------|
| 80486SX | open | pins 2 & 3 closed |
|------------------------------------------------------------|
| Note:The location of jumpers JP1 and JP2 is unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J7 | J10 | J11 | J13 | J14 |
|-------+--------+----------+----------+----------+----------|
| 32KB | open | pins 1 & | pins 1 & | pins 1 & | pins 1 & |
| | | 2 | 2 | 2 | 2 |
|-------+--------+----------+----------+----------+----------|
| 128KB | closed | pins 2 & | pins 2 & | pins 2 & | pins 2 & |
| | | 3 | 3 | 3 | 3 |
|------------------------------------------------------------|
| Note:Pins designated should be in the closed postion. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache SRAM | Location | TAG |
|------------+---------------+---------------+---------------|
| 32KB | (4) 8K x 8 | CACHE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | CACHE | (1) 32K x 8 |
|------------------------------------------------------------|
| Note:This configuartion is unverified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | VRAM | Location |
|-----------------+--------------------+---------------------|
| 256KB | (2) 44256 | Bank 0 |
|-----------------+--------------------+---------------------|
| 512KB | (4) 44256 | Banks 0 & 1 |
|-----------------+--------------------+---------------------|
| 1MB | (8) 44256 | Banks 0, 1, 2 and 3 |
+------------------------------------------------------------+