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# MITAC INTERNATIONAL CORPORATION
IH4077D
Processor 80486SX/CXM7/80486DX/80486DX2/80486DX4/P23N/P24D/Pentium Overdrive
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set EFAR
Max. 64MB
Onboard
DRAM
Cache 64/128/256KB
BIOS Award
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (2), floppy drive interface, IDE
Options interface, parallel port, serial ports (2)
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| IDE interface | CN1 | Turbo switch | JP45 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN2 | Reset switch | JP46 |
| interface | | | |
|-------------------+----------+------------------+----------|
| Serial port 2 | J9 | Power LED & | JP49 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| Serial port 1 | J10 | Speaker | JP50 |
|-------------------+----------+------------------+----------|
| Parallel port | J11 | IDE interface | JP51 |
| | | LED | |
|-------------------+----------+------------------+----------|
| External battery | JP7 | D/D board | JP200 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Turbo LED | JP21 | 32-bit VESA | SL1 & |
| | | local bus slots | SL2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | Factory configured - do not | JP1 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP2 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP3 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP4 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP4 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP5 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP6 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Parallel port IRQ select IRQ7 | JP13 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Parallel port IRQ select IRQ5 | JP13 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP14 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP15 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP23 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP33 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP48 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | BIOS type select normal | JP130 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | BIOS type select flash | JP130 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 1MB | (1) 256K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 256K x | (1) 256K x | NONE | NONE |
| | 36 | 36 | | |
|------+-------------+-------------+------------+------------|
| 2MB | (1) 512K x | NONE | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 3MB | (1) 256K x | (1) 256K x | (1) 256K x | NONE |
| | 36 | 36 | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 512K x | NONE | (1) 512K x | NONE |
| | 36 | | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 256K x | (1) 1M x 36 | NONE | NONE |
| | 36 | | | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 512K x | NONE | (1) 1M x | NONE |
| | 36 | | 36 | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 2M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | NONE | (1) 2M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 8M x 36 | NONE | NONE | NONE |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x | (1) 4M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 8M x 36 | NONE | (1) 8M x | NONE |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|------------------------------------------------------------|
| Note: The orientation of the banks is unidentified. |
| Bank 0 = U23, 25, 27, & 29. Bank 1 = U24, 26, 28, & |
| 30. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8 | JP9 | JP10 | JP11 | JP12 |
|-------+--------+--------+--------+------------+------------|
| 64KB | Open | Open | Open | pins 1 & 2 | pins 1 & 2 |
| | | | | closed | closed |
|-------+--------+--------+--------+------------+------------|
| 128KB | Closed | Closed | Open | pins 2 & 3 | pins 2 & 3 |
| | | | | closed | closed |
|-------+--------+--------+--------+------------+------------|
| 256KB | Closed | Closed | Closed | pins 1 & 2 | pins 1 & 2 |
| | | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP16 | JP18 | JP24 | JP27 | JP28 | JP29 |
|--------+--------+--------+--------+--------+-------+-------|
|80486SX | Closed | Open | Open | Open |Closed | Open |
|--------+--------+--------+--------+--------+-------+-------|
| CX M7 | Open | Closed | Closed | Closed | Open |Closed |
|--------+--------+--------+--------+--------+-------+-------|
|80486DX | Closed | Open | Open | Open |Closed | Open |
|--------+--------+--------+--------+--------+-------+-------|
|80486DX2| Closed | Open | Open | Open |Closed | Open |
|--------+--------+--------+--------+--------+-------+-------|
|80486DX4| Closed | Open | Open | Open |Closed | Open |
|--------+--------+--------+--------+--------+-------+-------|
| P23N | Closed | Open | Open | Open |Closed | Open |
|--------+--------+--------+--------+--------+-------+-------|
| P24D | Open | Closed | Closed | Open |Closed | Open |
|--------+--------+--------+--------+--------+-------+-------|
| P24T | Open | Closed | Closed | Open |Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP34 | JP35 | JP38 | JP39 | JP40 | JP41 |
|----------+--------+--------+--------+--------+------+------|
| 80486SX | Closed | Closed | Closed | Open | Open | 2 & |
| | | | | | | 3 |
|----------+--------+--------+--------+--------+------+------|
| CX M7 | Open | Open | Open | Closed | 2 & | 1 & |
| | | | | | 3 | 2 |
|----------+--------+--------+--------+--------+------+------|
| 80486DX | Closed | Closed | Closed | Closed | 2 & | 1 & |
| | | | | | 3 | 2 |
|----------+--------+--------+--------+--------+------+------|
| 80486DX2 | Closed | Closed | Closed | Closed | 2 & | 1 & |
| | | | | | 3 | 2 |
|----------+--------+--------+--------+--------+------+------|
| 80486DX4 | Closed | Closed | Closed | Closed | 2 & | 1 & |
| | | | | | 3 | 2 |
|----------+--------+--------+--------+--------+------+------|
| P23N | Closed | Closed | Closed | Closed | 1 & | 1 & |
| | | | | | 2 | 2 |
|----------+--------+--------+--------+--------+------+------|
| P24D | Open | Open | Open | Closed | 2 & | 1 & |
| | | | | | 3 | 2 |
|----------+--------+--------+--------+--------+------+------|
| P24T | Open | Open | Open | Closed | 1 & | 1 & |
| | | | | | 2 | 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Type | JP42 | JP43 | JP44 | JP47 | JP110 |
|-----------+---------+---------+---------+---------+--------|
| 80486SX | 2 & 3 | 2 & 3 | 2 & 3 | Open | Open |
|-----------+---------+---------+---------+---------+--------|
| CX M7 | 1 & 2 | 1 & 2 | 1 & 2 | Closed | Closed |
|-----------+---------+---------+---------+---------+--------|
| 80486DX | 2 & 3 | 2 & 3 | 2 & 3 | Open | Open |
|-----------+---------+---------+---------+---------+--------|
| 80486DX2 | 2 & 3 | 2 & 3 | 2 & 3 | Open | Open |
|-----------+---------+---------+---------+---------+--------|
| 80486DX4 | 2 & 3 | 2 & 3 | 2 & 3 | Open | Open |
|-----------+---------+---------+---------+---------+--------|
| P23N | 2 & 3 | 2 & 3 | 2 & 3 | Open | Open |
|-----------+---------+---------+---------+---------+--------|
| P24D | 2 & 3 | 2 & 3 | 2 & 3 | Closed | Open |
|-----------+---------+---------+---------+---------+--------|
| P24T | 2 & 3 | 2 & 3 | 2 & 3 | Open | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CX M7 ONLY) |
|------------------------------------------------------------|
| Type | JP25 |
|-------------------------------+----------------------------|
| CX486DX | Open |
|-------------------------------+----------------------------|
| CX486DX2 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP30 | JP31 | JP32 |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 40MHZ | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 50MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 75iMHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 100iMHz | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION (80486DX4 ONLY) |
|------------------------------------------------------------|
| Speed | JP22 | JP26 |
|--------------------+-------------------+-------------------|
| 1x | N/A | Open |
|--------------------+-------------------+-------------------|
| 2x | Closed | N/A |
|--------------------+-------------------+-------------------|
| 2.5x | N/A | N/A |
|--------------------+-------------------+-------------------|
| 3x | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP37 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP36 |
|----------------------------+-------------------------------|
| <= 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+