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# CHICONY, INC.
CH-471A
Processor CX486S/80486SX/SL80486SX/CX486S2/CX486DX/AM486DXL/80486DX/ SL80486DX/
AM486DXL2/80486DX2/SL80486DX2/P24D/80486DX4/Pentium Overdrive
Processor 20/25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set SIS
Max. 128MB
Onboard
DRAM
Cache 32/64/128/256/512/1024KB
BIOS Award
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (3), green PC connector
Options
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------+----------+-----------------------+----------|
| Reset switch | J3 | Speaker | J8 |
|--------------+----------+-----------------------+----------|
| Green PC | J4 | External battery | JP19 |
| connector | | | |
|--------------+----------+-----------------------+----------|
| Turbo switch | J5 | Green PC connector | JP38 |
|--------------+----------+-----------------------+----------|
| Turbo LED | J6 | Green PC connector | JP39 |
|--------------+----------+-----------------------+----------|
| Power LED & | J7 | 32-bit VESA local bus | SL1 - |
| keylock | | slots | SL3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CPU clock down control select | JP6 | pins 1 & 2 |
| | STPCLK | | closed |
|---+----------------------------------+--------+------------|
| | CPU clock down control select | JP6 | pins 2 & 3 |
| | SMOUT0 | | closed |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP7 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP7 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP17 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| | CPU type select all CPU types | JP22 | Open |
|---+----------------------------------+--------+------------|
| | CPU type select CX486S2 only | JP22 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP37 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Address strobe type select | JP40 | pins 1 & 2 |
| | normal | | closed |
|---+----------------------------------+--------+------------|
| | Address strobe type select | JP40 | pins 2 & 3 |
| | delayed | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP45 | N/A |
| | alter | | |
|------------------------------------------------------------|
| Note: The location of JP40 is unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+---------------+-------------+------------+----------|
| 1MB | (1) 256K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 256K x 36 | (1) 256K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 512K x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 512K x 36 | (1) 512K x | NONE | NONE |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 1M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 5MB | (1) 256K x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 6MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 6MB | (1) 512K x 36 | (1) 1M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 256K x 36 | (1) 256K x | (1) 512K x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 8MB | (1) 512K x 36 | (1) 512K x | (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 |
|------+---------------+-------------+------------+----------|
| 10MB | (1) 256K x 36 | (1) 256K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 12MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 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 | (1) 2M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 16MB | (1) 4M x 36 | NONE | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 17MB | (1) 256K x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 18MB | (1) 256K x 36 | (1) 256K x | (1) 4M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 18MB | (1) 512K x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 20MB | (1) 512K x 36 | (1) 512K x | (1) 4M x | NONE |
| | | 36 | 36 | |
|------+---------------+-------------+------------+----------|
| 20MB | (1) 1M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 512K x 36 | (1) 512K x | (1) 1M x | (1) 4M x |
| | | 36 | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 24MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | NONE |
| | | | 36 | |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x | (1) 2M x |
| | | | 36 | 36 |
|------+---------------+-------------+------------+----------|
| 32MB | (1) 8M x 36 | NONE | NONE | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 512K x | (1) 512K x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 36MB | (1) 1M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 48MB | (1) 4M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 16M x | NONE | NONE | NONE |
| | 36 | | | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 36 | (1) 8M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 65MB | (1) 256K x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 1M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 68MB | (1) 1M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 1M x 36 | (1) 1M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 72MB | (1) 1M x 36 | (1) 1M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 4M x 36 | (1) 16M x | NONE | NONE |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 80MB | (1) 4M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 36 | (1) 4M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 96MB | (1) 4M x 36 | (1) 4M x | (1) 16M x | NONE |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 8M x 36 | (1) 8M x | (1) 8M x | (1) 8M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 128MB | (1) 16M x | (1) 16M x | NONE | NONE |
| | 36 | 36 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 32KB | (4) 8K x 8 | NONE | (1) 8K x 8 |
|------------+---------------+---------------+---------------|
| 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) 16K x 8 |
|------------+---------------+---------------+---------------|
| 512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 128K x 8 | (4) 128K x 8 | (1) 64K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP1 | JP2 | JP3 | JP4 | JP5 | JP14 | JP16 |
|--------+---------+-------+-----+-----+-----+-------+-------|
| 32KB | 1 & 2, | 2 & 3 | 1 & | 1 & | 1 & | 1 & 2 | 1 & 2 |
| | 3 & 4 | | 2 | 2 | 2 | | |
|--------+---------+-------+-----+-----+-----+-------+-------|
| 64KB | 2 & 3, | 1 & 2 | 1 & | 2 & | 1 & | 1 & 2 | 1 & 2 |
| | 4 & 5 | | 2 | 3 | 2 | | |
|--------+---------+-------+-----+-----+-----+-------+-------|
| 128KB | 1 & 2, | 2 & 3 | 2 & | 2 & | 1 & | 1 & 2 | 2 & 3 |
| | 3 & 4 | | 3 | 3 | 2 | | |
|--------+---------+-------+-----+-----+-----+-------+-------|
| 256KB | 2 & 3, | 1 & 2 | 2 & | 2 & | 2 & | 1 & 2 | 2 & 3 |
| | 4 & 5 | | 3 | 3 | 3 | | |
|--------+---------+-------+-----+-----+-----+-------+-------|
| 512KB | 1 & 2, | 2 & 3 | 2 & | 2 & | 2 & | 2 & 3 | 2 & 3 |
| | 3 & 4 | | 3 | 3 | 3 | | |
|--------+---------+-------+-----+-----+-----+-------+-------|
| 1MB | 2 & 3, | 1 & 2 | 2 & | 2 & | 2 & | 2 & 3 | 2 & 3 |
| | 4 & 5 | | 3 | 3 | 3 | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP10 | JP11 | JP20 | JP21 | JP23 |
|-------------+---------+---------+---------+--------+-------|
| CX486S | 2 & 3 | 1 & 2 | 2 & 3 | Open | Open |
|-------------+---------+---------+---------+--------+-------|
| 80486SX | 1 & 2 | 2 & 3 | 2 & 3 | Open | Open |
|-------------+---------+---------+---------+--------+-------|
| SL80486SX | 1 & 2 | 2 & 3 | 2 & 3 | Open | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| CX486DX | 2 & 3 | 1 & 2 | 1 & 2 | Closed | Open |
|-------------+---------+---------+---------+--------+-------|
| AM486DXL | 1 & 2 | 2 & 3 | 1 & 2 | Closed | Open |
|-------------+---------+---------+---------+--------+-------|
| 80486DX | 1 & 2 | 2 & 3 | 1 & 2 | Closed | Open |
|-------------+---------+---------+---------+--------+-------|
| SL80486DX | 1 & 2 | 2 & 3 | 1 & 2 | Closed | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| CX486DX2 | 2 & 3 | 1 & 2 | 1 & 2 | Closed | Open |
|-------------+---------+---------+---------+--------+-------|
| AM486DXL2 | 1 & 2 | 2 & 3 | 1 & 2 | Closed | Open |
|-------------+---------+---------+---------+--------+-------|
| SL80486DX2 | 1 & 2 | 2 & 3 | 1 & 2 | Closed | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| P24D | 1 & 2 | 2 & 3 | 1 & 2 | Closed | 2 & 3 |
|-------------+---------+---------+---------+--------+-------|
| 80486DX4 | 1 & 2 | 2 & 3 | 1 & 2 | Closed | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| P24T | 1 & 2 | 1 & 2 | 1 & 2 | Closed | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP24 | JP25 | JP26 | JP27 | JP28 |
|------------+-------+----------+----------+--------+--------|
| CX486S | 2 & 3 | 2 & 3, 4 | 1 & 2, 3 | Open | Open |
| | | & 5 | & 4 | | |
|------------+-------+----------+----------+--------+--------|
| 80486SX | Open | Open | Open | Open | Open |
|------------+-------+----------+----------+--------+--------|
| SL80486SX | 4 & 5 | 3 & 4 | 2 & 3 | Open | Open |
|------------+-------+----------+----------+--------+--------|
| CX486DX | 2 & 3 | 2 & 3 | 1 & 2, 3 | Open | Open |
| | | | & 4 | | |
|------------+-------+----------+----------+--------+--------|
| AM486DXL | Open | Open | Open | Open | Open |
|------------+-------+----------+----------+--------+--------|
| 80486DX | Open | Open | Open | Open | Open |
|------------+-------+----------+----------+--------+--------|
| SL80486DX | 4 & 5 | 3 & 4 | 2 & 3 | Open | Open |
|------------+-------+----------+----------+--------+--------|
| CX486DX2 | 2 & 3 | 2 & 3 | 1 & 2, 3 | Open | Open |
| | | | & 4 | | |
|------------+-------+----------+----------+--------+--------|
| AM486DXL2 | Open | Open | Open | Open | Open |
|------------+-------+----------+----------+--------+--------|
| SL80486DX2 | 4 & 5 | 3 & 4 | 2 & 3 | Open | Open |
|------------+-------+----------+----------+--------+--------|
| P24D | 4 & 5 | 1 & 2, 3 | 2 & 3 | Closed | Closed |
| | | & 4 | | | |
|------------+-------+----------+----------+--------+--------|
| 80486DX4 | 4 & 5 | 3 & 4 | 2 & 3 | Open | Open |
|------------+-------+----------+----------+--------+--------|
| P24T | 1 & 2 | 3 & 4 | 2 & 3 | Open | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP29 | JP30 | JP31 | JP33 | JP36 |
|-------------+---------+---------+---------+--------+-------|
| CX486S | 2 & 3 | 2 & 3 | Open | 2 & 3 | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| 80486SX | 2 & 3 | Open | Open | Open | Open |
|-------------+---------+---------+---------+--------+-------|
| SL80486SX | 2 & 3 | Open | Open | Open | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| CX486DX | 2 & 3 | 2 & 3 | 3 & 4 | 2 & 3 | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| AM486DXL | 2 & 3 | 3 & 4 | 1 & 2 | Open | 2 & 3 |
|-------------+---------+---------+---------+--------+-------|
| 80486DX | 2 & 3 | Open | 3 & 4 | Open | Open |
|-------------+---------+---------+---------+--------+-------|
| SL80486DX | 2 & 3 | Open | 3 & 4 | Open | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| CX486DX2 | 2 & 3 | 2 & 3 | 3 & 4 | 2 & 3 | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| AM486DXL2 | 2 & 3 | 3 & 4 | 1 & 2 | Open | 2 & 3 |
|-------------+---------+---------+---------+--------+-------|
| SL80486DX2 | 2 & 3 | Open | 3 & 4 | Open | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| P24D | 1 & 2 | Open | 3 & 4 | Open | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| 80486DX4 | 2 & 3 | Open | 3 & 4 | Open | 1 & 2 |
|-------------+---------+---------+---------+--------+-------|
| P24T | 1 & 2 | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP8 | JP12 | JP13 |
|---------------+--------------+--------------+--------------|
| 20MHz | Open | Open | Open |
|---------------+--------------+--------------+--------------|
| 25MHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 33MHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 40MHz | Open | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 50iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 50MHz | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| 66iMHz | Closed | Closed | Closed |
|---------------+--------------+--------------+--------------|
| 75iMHz | Open | Open | Closed |
|---------------+--------------+--------------+--------------|
| 100iMHz | Closed | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP32 | JP34 | JP35 |
|---------+----------------+----------------+----------------|
| 3.3v | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|---------+----------------+----------------+----------------|
| 5v | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP44 |
|----------------------------+-------------------------------|
| 0 wait states | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP47 |
|----------------------------+-------------------------------|
| <= 33MHz | pins 1 & 2 closed |
|----------------------------+-------------------------------|
| > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+