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# INFORMTECH INTERNATIONAL, INC.
IT486SMVG MINI VER. 1.1
Processor 80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive
Processor 20/25/33/40(internal)50/50(internal)/66(internal)MHz
Speed
Chip Set FOREX
Max. 64MB
Onboard
DRAM
Cache 64/128/256KB
BIOS AMI
Dimensions 230mm x 218mm
I/O 32-bit VESA local bus slots (3)
Options
NPU None
Options
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Turbo LED | J6 | Reset switch | J10 |
|--------------+----------+-----------------------+----------|
| Speaker | J7 | External battery | JP1 |
|--------------+----------+-----------------------+----------|
| Turbo switch | J8 | 32-bit VESA Local bus | SL1 |
| | | slots | |
|--------------+----------+-----------------------+----------|
| Power LED & | J9 | 32-bit VESA Local bus | SL2 & |
| keylock | | slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-----------------------------------+-----------+------------|
| » | CPU type select - | JP2 | pins 1 & 2 |
| | 486DX/DX2/P24T (PGA) | | closed |
|---+-------------------------------+-----------+------------|
| | CPU type select - 486SX/DX | JP2 | pins 2 & 3 |
| | (PQFP) & 487SX/P23T (PGA) | | closed |
|---+-------------------------------+-----------+------------|
| » | CPU type select -PGA | JP3 & JP4 | pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| | CPU type select -PQFP | JP3 & JP4 | pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| » | PFPQ disabled | JP5 | Closed |
|---+-------------------------------+-----------+------------|
| | PFPQ enabled | JP5 | Open |
|---+-------------------------------+-----------+------------|
| » | CMOS memory normal operation | JP6 | Open |
|---+-------------------------------+-----------+------------|
| | CMOS memory clear | JP6 | Closed |
|---+-------------------------------+-----------+------------|
| » | Factory configured - do not | JP9 | Open |
| | alter | | |
|---+-------------------------------+-----------+------------|
| » | CPU type select - 486CPU | JP12 | pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| | CPU type select - P24T CPU | JP12 | pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-----------+------------|
| » | Factory configured - do not | JP13 | Open |
| | alter | | |
|---+-------------------------------+-----------+------------|
| » | Factory configured - do not | JP14 | Open |
| | alter | | |
|---+-------------------------------+-----------+------------|
| » | Factory configured - do not | JP15 | Open |
| | alter | | |
|---+-------------------------------+-----------+------------|
| » | Factory configured - do not | JP16 | Open |
| | alter | | |
|---+-------------------------------+-----------+------------|
| » | Cyrix CPU type select - | JP20 | Open |
| | CX486DX | | |
|---+-------------------------------+-----------+------------|
| | Cyrix CPU type select - | JP20 | Closed |
| | CX486DX2 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 64MB | (4) 16M x 9 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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: Bank 0 = U31, U32, U33, U34 Bank 1 = U27, U28, U29, |
| U30 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP8A | JP8B | JP8C |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLOCK SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP7A | JP7B | JP7C |
|---------------+--------------+--------------+--------------|
| 20MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 25MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 33MHz | Open | Open | Open |
|---------------+--------------+--------------+--------------|
| 40MHz | Closed | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50MHz | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| 50iMHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE/BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait states | JP10 | JP11 |
|-----------+---------------+-------------------+------------|
| < 33MHz | 0 wait states | pins 1 & 2 closed | pins 1 & 2 |
| | | | closed |
|-----------+---------------+-------------------+------------|
| > 33MHz | 1 wait state | pins 2 & 3 closed | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+