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# ATC/UNITRON COMPUTERS & COMPUTER PARTS
U6931/G/E/C
Processor CX486M6/80486SX/80487SX/CX486M7/80486DX/80486DX2/80486DX4/
P24D/P24T
Processor 25/33/40/50(internal)/50/66(internal)/75(internal/100(internal)MHz
Speed
Chip Set OPTI
Max. 128MB
Onboard
DRAM
Cache 64/128/256/512KB
BIOS Award
Dimensions 250mm x 220mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | J2 | Speaker | JP38 |
|------------------+----------+-------------------+----------|
| Power LED & | JP22 | Green PC | JP39 |
| keylock | | connector | |
|------------------+----------+-------------------+----------|
| Turbo LED | JP34 | Reset switch | S1 |
|------------------+----------+-------------------+----------|
| Turbo switch | JP36 | 32-bit VESA local | SL1 - |
| | | bus slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| | Monitor type select | JP1 | Open |
| | monochrome/EGA/VGA | | |
|---+----------------------------------+--------+------------|
| | Monitor type select color/CGA | JP1 | Closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP2 | Pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP2 | Pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | Open |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP7 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| | P24D write back enabled | JP19 | Pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | P24D write through enabled | JP19 | Pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU type select any CPU except | JP22 | Open |
| | CX486M7 2x | | |
|---+----------------------------------+--------+------------|
| | CPU type select CX486M7 2x only | JP22 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP31 | Pins 2 & 3 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP41 | N/A |
| | alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+---------------+-----------+----------|
| 2MB | (4) 256K x | (1) 256K x 36 | None | None |
| | 9 | | | |
|-------+-------------+---------------+-----------+----------|
| 2MB | None | (1) 512K x 36 | None | None |
|-------+-------------+---------------+-----------+----------|
| 4MB | (4) 1M x 9 | None | None | None |
|-------+-------------+---------------+-----------+----------|
| 4MB | None | (1) 1M x 36 | None | None |
|-------+-------------+---------------+-----------+----------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | None | None |
|-------+-------------+---------------+-----------+----------|
| 8MB | None | (1) 2M x 36 | None | None |
|-------+-------------+---------------+-----------+----------|
| 16MB | (4) 4M x 9 | None | None | None |
|-------+-------------+---------------+-----------+----------|
| 16MB | None | (1) 4M x 36 | None | None |
|-------+-------------+---------------+-----------+----------|
| 16MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|-------+-------------+---------------+-----------+----------|
| 16MB | None | (1) 2M x 36 | (1) 2M x | None |
| | | | 36 | |
|-------+-------------+---------------+-----------+----------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 | None | None |
|-------+-------------+---------------+-----------+----------|
| 32MB | None | (1) 4M x 36 | (1) 4M x | None |
| | | | 36 | |
|-------+-------------+---------------+-----------+----------|
| 64MB | None | (1) 16M x 36 | None | None |
|-------+-------------+---------------+-----------+----------|
| 64MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|-------+-------------+---------------+-----------+----------|
| 128MB | None | (1) 16M x 36 | (1) 16M x | None |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP5 |
|-------------------------------+----------------------------|
| 30-pin SIMM as Bank 0 | Pins 2 & 3 closed |
|-------------------------------+----------------------------|
| 72-pin SIMM as Bank 0 | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-------------+---------------+---------------+--------------|
| 64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 128KB | (4) 32K x 8 | None | (1) 8K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8 |
|-------------+---------------+---------------+--------------|
| 256KB (B) | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|-------------+---------------+---------------+--------------|
| 512KB | (4) 128K x 8 | None | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP27 | JP28 | JP43 | JP44 |
|------------+---------+----------+---------+--------+-------|
| 64KB | 2 & 3 | Open | Open | Open | 1 & 2 |
|------------+---------+----------+---------+--------+-------|
| 128KB | 1 & 2 | Closed | Open | Open | 1 & 2 |
|------------+---------+----------+---------+--------+-------|
| 256KB (A) | 2 & 3 | Closed | Closed | Open | 2 & 3 |
|------------+---------+----------+---------+--------+-------|
| 256KB (B) | 2 & 3 | Closed | Closed | Open | 1 & 2 |
|------------+---------+----------+---------+--------+-------|
| 512KB | 1 & 2 | Closed | Closed | Closed | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP9 | JP11 | JP12 | JP13 | JP15 | JP23 | JP32 |
|---------+-------+------+------+------+------+-------+------|
| CX486M6 |Closed |2 & 3 |2 & 3 | Open | Open | 2 & 3 |1 & 2 |
|---------+-------+------+------+------+------+-------+------|
| 80486SX | Open |1 & 2 | Open | Open | Open | 2 & 3 | Open |
|---------+-------+------+------+------+------+-------+------|
| 80487SX | Open |1 & 2 | Open |2 & 3 | Open |1 & 2, | Open |
| | | | | | | 3 & 4 | |
|---------+-------+------+------+------+------+-------+------|
| CX486M7 |Closed |2 & 3 |2 & 3 |1 & 2 | Open |1 & 2, | Open |
| | | | | | | 3 & 4 | |
|---------+-------+------+------+------+------+-------+------|
| 80486DX | Open |1 & 2 | Open |1 & 2 | Open |1 & 2, | Open |
| | | | | | | 3 & 4 | |
|---------+-------+------+------+------+------+-------+------|
|80486DX2 | Open |1 & 2 | Open |1 & 2 | Open |1 & 2, | Open |
| | | | | | | 3 & 4 | |
|---------+-------+------+------+------+------+-------+------|
| P24D | Open |2 & 3 | Open |1 & 2 |Closed|1 & 2, |2 & 3 |
| | | | | | | 3 & 4 | |
|---------+-------+------+------+------+------+-------+------|
|80486DX4 | N/A |1 & 2 |1 & 2 |1 & 2 | N/A |1 & 2, | Open |
| | | | | | | 3 & 4 | |
|---------+-------+------+------+------+------+-------+------|
| P24T | Open |2 & 3 | Open |1 & 2 |Closed|1 & 2, |2 & 3 |
| | | | | | | 3 & 4 | |
|------------------------------------------------------------|
|Note: Pins designated should be in the closed position. See |
|also JP19 & JP22 in User Configurable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP10 | JP12 | JP20 | JP21 |
|-----------------+--------+---------------+--------+--------|
| Non SL-enhanced | Open | Open | Open | Open |
|-----------------+--------+---------------+--------+--------|
| SL-enhanced | Closed | Pins 1 & 2 | Closed | Closed |
| | | closed | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP16 | JP17 | JP18 |
|---------------+-------------+---------------+--------------|
| 25MHz | Open | Open | Open |
|---------------+-------------+---------------+--------------|
| 33MHz | Open | Closed | Closed |
|---------------+-------------+---------------+--------------|
| 40MHz | Open | Closed | Open |
|---------------+-------------+---------------+--------------|
| 50iMHz | Open | Open | Open |
|---------------+-------------+---------------+--------------|
| 50MHz | Open | Open | Closed |
|---------------+-------------+---------------+--------------|
| 66iMHz | Open | Closed | Closed |
|---------------+-------------+---------------+--------------|
| 75iMHz | Open | Open | Open |
|---------------+-------------+---------------+--------------|
| 100iMHz | Open | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP30 |
|----------------------------+-------------------------------|
| 2x | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 2.5x | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 3x | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP29 |
|----------------------------+-------------------------------|
| 3.45v | Pins 3 & 5, 4 & 6 closed |
|----------------------------+-------------------------------|
| 5v | Pins 1 & 3, 2 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP35 |
|-------------------------------+----------------------------|
| 0 wait states | Open |
|-------------------------------+----------------------------|
| 1 wait state | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP33 | JP37 |
|--------------------+--------------------+------------------|
| <= 33MHz | Pins 2 & 3 closed | Open |
|--------------------+--------------------+------------------|
| > 33MHz | Pins 1 & 2 closed | Closed |
+------------------------------------------------------------+