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# UNITRON COMPUTER, INC.
3/486 MAINBOARD
Processor 80386DX/CX486DLC/80486SX/80486DX/ODP486SX/80486DX2
Processor 25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set UMC
Max. 32MB
Onboard
DRAM
SRAM Cache 32/64/128/256KB
BIOS AMI/Phoenix
Dimensions 230mm x 218mm
I/O Options 32-bit proprietary local bus slot, 32-bit VESA
local bus slot
NPU Options 80387DX/CX487DLC
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J1 | Speaker | J29 |
|------------------+----------+-------------------+----------|
| Turbo LED | J25 | Power LED & | J30 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Reset switch | J26 | 32-bit local bus | S1 |
| | | slot | |
|------------------+----------+-------------------+----------|
| Turbo switch | J28 | 32-bit VESA local | S2 |
| | | bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Monitor type select color | J6 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | J6 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Parity enabled | J9 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Parity disabled | J9 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J21 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J31 | Open |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 20MB | (4) 4M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Cache | Location | TAG |
|------------+---------------+---------------+---------------|
| 32KB | (8) 8K x 8 | Bank 0 | (1) 8K x8 |
|------------+---------------+---------------+---------------|
| 64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J7 | J8 | J11 | J12 | J13 | J17 | J18 |
| | | | | | & | | |
| | | | | | J19 | | |
|-------+-------+-------+-------+-------+------+------+------|
| 32KB | Open | pins | pins | pins | pins | pins | pins |
| | | 2 & 3 | 1 & 2 | 1 & 2 | 1 & | 1 & | 1 & |
| | | | | | 2 | 2 | 2 |
|-------+-------+-------+-------+-------+------+------+------|
| 64KB | Open | pins | pins | pins | pins | pins | pins |
| | | 1 & 2 | 1 & 2 | 2 & 3 | 1 & | 1 & | 2 & |
| | | | | | 2 | 2 | 3 |
|-------+-------+-------+-------+-------+------+------+------|
| 128KB | pins | pins | pins | pins | pins | pins | pins |
| | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & | 1 & | 2 & |
| | | | | | 3 | 2 | 3 |
|-------+-------+-------+-------+-------+------+------+------|
| 256KB | pins | pins | pins | pins | pins | pins | pins |
| | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 | 2 & | 2 & | 2 & |
| | | | | | 3 | 3 | 3 |
|------------------------------------------------------------|
| Note: Pins designated should in the closed position. |
+------------------------------------------------------------+
.
+------------------------------------------------------------+
| VESA MODE CONFIGURATION |
|------------------------------------------------------------|
| Mode | J22 | J23 | J24 |
|-----------+------------------+--------------+--------------|
| Master | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|-----------+------------------+--------------+--------------|
| Slave | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|------------------------------------------------------------|
| Note: VESA master mode can only be enabled when IC PAL |
| 16R4 is installed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | J10 | J14 | J15 | J16 | J20 |
|---------------+--------+--------+--------+--------+--------|
| 80386DX with | pins 1 | N/A | pins 1 | N/A | N/A |
| NPU | & 2 | | & 2 | | |
|---------------+--------+--------+--------+--------+--------|
| 80386DX w/o | pins 1 | N/A | pins 2 | N/A | N/A |
| NPU | & 2 | | & 3 | | |
|---------------+--------+--------+--------+--------+--------|
| 80486SX PQFP | pins 2 | Open | pins 2 | pins 2 | Open |
| | & 3 | | & 3 | & 3 | |
|---------------+--------+--------+--------+--------+--------|
| 80486SX PGA | pins 2 | Open | pins 2 | pins 2 | pins 2 |
| | & 3 | | & 3 | & 3 | & 3 |
|---------------+--------+--------+--------+--------+--------|
| 80486SX | pins 2 | pins 2 | pins 2 | pins 1 | pins 1 |
| | & 3 | & 3 | & 3 | & 2 | & 2 |
|---------------+--------+--------+--------+--------+--------|
| 80486SX + | pins 2 | pins 1 | pins 2 | pins 1 | pins 2 |
| 487SX OD | & 3 | & 2 | & 3 | & 2, 3 | & 3 |
| | | | | & 4 | |
|---------------+--------+--------+--------+--------+--------|
| 80486SX + | pins 2 | pins 1 | pins 2 | pins 1 | pins 2 |
| 486DX PGA | & 3 | & 2 | & 3 | & 2, 3 | & 3 |
| | | | | & 4 | |
|---------------+--------+--------+--------+--------+--------|
| 80486DX | pins 2 | pins 2 | pins 2 | pins 1 | pins 2 |
| | & 3 | & 3 | & 3 | & 2, 3 | & 3 |
| | | | | & 4 | |
|---------------+--------+--------+--------+--------+--------|
| 80486DX2 | pins 2 | pins 2 | pins 2 | pins 1 | pins 2 |
| | & 3 | & 3 | & 3 | & 2, 3 | & 3 |
| | | | | & 4 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| | ICS2494 ( | |
| | CPU Clock | |
| | Generator) | |
|--------+-------------+-------------------------------------|
| Speed | J2 | J3 | J4 | J5 |
|--------+-------------+------------+------------+-----------|
| 25MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & |
| | closed | closed | closed | 2 closed |
|--------+-------------+------------+------------+-----------|
| 33MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & |
| | closed | closed | closed | 2 closed |
|--------+-------------+------------+------------+-----------|
| 40MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 1 & |
| | closed | closed | closed | 2 closed |
|--------+-------------+------------+------------+-----------|
| 50iMHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & |
| | closed | closed | closed | 2 closed |
|--------+-------------+------------+------------+-----------|
| 50MHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & |
| | closed | closed | closed | 2 closed |
|--------+-------------+------------+------------+-----------|
| 66iMHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & |
| | closed | closed | closed | 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| | IMISC425 ( | |
| | CPU Clock | |
| | Generator) | |
|--------+-------------+-------------------------------------|
| Speed | J2 | J3 | J4 | J5 |
|--------+-------------+------------+------------+-----------|
| 25MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & |
| | closed | closed | closed | 2 closed |
|--------+-------------+------------+------------+-----------|
| 33MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & |
| | closed | closed | closed | 2 closed |
|--------+-------------+------------+------------+-----------|
| 40MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & |
| | closed | closed | closed | 3 closed |
|--------+-------------+------------+------------+-----------|
| 50iMHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & |
| | closed | closed | closed | 2 closed |
|--------+-------------+------------+------------+-----------|
| 50MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 2 & |
| | closed | closed | closed | 3 closed |
|--------+-------------+------------+------------+-----------|
| 66iMHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 2 & |
| | closed | closed | closed | 3 closed |
+------------------------------------------------------------+