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# CHICONY, INC.
CH-471A (VER. 3)
Processor CX486S/80486SX/SL80486SX/80486SX2/SL80486SX2/UMCU5S/
CX486DX/AM486DX/80486DX/SL80486DX/CX486DX2/CX486DX2V/
AM486DX2/80486DX2/SL80486DX2/AM486DX4/80486DX4/P24D/ P24T/CXM9
Processor 20/25/33/40/50(internal)/50/66(internal)/75(internal)/83(internal)/
Speed 100(internal)MHz
Chip Set SIS
Video Chip None
Set
Maximum 128MB
Onboard
Memory
Maximum None
Video
Memory
Cache 32/64/128/256/512/1024KB
BIOS Award
Dimensions 254mm x 218mm
I/O 32-bit VESA local bus slots (3), green PC connectors (2)
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 | PC1 - |
| keylock | | bus slots | PC3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|---------------------------------------+-------+------------|
| | Clock down control by STOPCLK | JP6 | Pins 1 & 2 |
| | control (80486DX4) | | closed |
|---+-----------------------------------+-------+------------|
| | Clock down control by SMOUT0 | JP6 | Pins 2 & 3 |
| | control (all other CPUs) | | closed |
|---+-----------------------------------+-------+------------|
| » | CMOS memory normal operation | JP7 | Pins 1 & 2 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | CMOS memory clear | JP7 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| | Monitor type select color | JP45 | Closed |
|---+-----------------------------------+-------+------------|
| | Monitor type select monochrome | JP45 | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+---------------+-------------+------------+----------|
| 1MB | (1) 256K x 36 | None | None | None |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 512K x 36 | None | None | None |
|------+---------------+-------------+------------+----------|
| 2MB | (1) 256K x 36 | (1) 256K x | None | None |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 1M x 36 | None | None | None |
|------+---------------+-------------+------------+----------|
| 4MB | (1) 512K x 36 | (1) 512K x | None | None |
| | | 36 | | |
|------+---------------+-------------+------------+----------|
| 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 |
|------+---------------+-------------+------------+----------|
| 18MB | (1) 256K x 36 | (1) 256K x | (1) 4M x | None |
| | | 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) 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 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 24MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | None |
| | | 36 | 36 | |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 4M x 36 | (1) 4M x | None | None |
| | | 36 | | |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 2M x 36 | (1) 2M x | (1) 2M x | (1) 2M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 32MB | (1) 8M x 36 | None | None | None |
|-------+-------------+------------+------------+------------|
| 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 | | |
|-------+-------------+------------+------------+------------|
| 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 & 3 | 1 & | 1 & | 1 & | 1 & 2 | 1 & 2 |
| | 2, 3 | | 2 | 2 | 2 | | |
| | & 4 | | | | | | |
|-------+-------+-------+------+------+------+-------+-------|
| 64KB | 2 & | 1 & 2 | 1 & | 2 & | 1 & | 1 & 2 | 1 & 2 |
| | 3, 4 | | 2 | 3 | 2 | | |
| | & 5 | | | | | | |
|-------+-------+-------+------+------+------+-------+-------|
| 128KB | 1 & | 2 & 3 | 2 & | 2 & | 1 & | 1 & 2 | 2 & 3 |
| | 2, 3 | | 3 | 3 | 2 | | |
| | & 4 | | | | | | |
|-------+-------+-------+------+------+------+-------+-------|
| 256KB | 2 & | 1 & 2 | 2 & | 2 & | 2 & | 1 & 2 | 2 & 3 |
| | 3, 4 | | 3 | 3 | 3 | | |
| | & 5 | | | | | | |
|-------+-------+-------+------+------+------+-------+-------|
| 512KB | 1 & | 2 & 3 | 2 & | 2 & | 2 & | 2 & 3 | 2 & 3 |
| | 2, 3 | | 3 | 3 | 3 | | |
| | & 4 | | | | | | |
|-------+-------+-------+------+------+------+-------+-------|
| 1MB | 2 & | 1 & 2 | 2 & | 2 & | 2 & | 2 & 3 | 2 & 3 |
| | 3, 4 | | 3 | 3 | 3 | | |
| | & 5 | | | | | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP8 | JP12 | JP13 | JP17 |
|----------+---------+---------+---------+-------------------|
| 20MHz | Open | Open | Open | Pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 25MHz | Open | Open | Closed | Pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 33MHz | Closed | Closed | Closed | Pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 40MHz | Open | Closed | Closed | Pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 50iMHz | Open | Open | Closed | Pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 50MHz | Closed | Open | Open | Pins 2 & 3 closed |
|----------+---------+---------+---------+-------------------|
| 66iMHz | Closed | Closed | Closed | Pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 75iMHz | Open | Open | Closed | Pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 83iMHz | Closed | Closed | Closed | Pins 1 & 2 closed |
|----------+---------+---------+---------+-------------------|
| 100iMHz | Closed | Closed | Closed | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP10 | JP11 | JP18 |
|---------------+----------+----------+----------------------|
| CX486S | 2 & 3 | 1 & 2 | Open |
|---------------+----------+----------+----------------------|
| 80486SX | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| SL80486SX | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| 80486SX2 | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| SL80486SX2 | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| UMC U5S | 2 & 3 | 1 & 2 | 1 & 2, 3 & 4, 5 & 6 |
|---------------+----------+----------+----------------------|
| CX486DX | 2 & 3 | 1 & 2 | Open |
|---------------+----------+----------+----------------------|
| AM486DX | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| 80486DX | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| SL80486DX | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| CX486DX2 | 2 & 3 | 1 & 2 | Open |
|---------------+----------+----------+----------------------|
| CX486DX2-V | 2 & 3 | 1 & 2 | Open |
|---------------+----------+----------+----------------------|
| AM486DX2 | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| 80486DX2 | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| SL80486DX2 | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| AM486DX4 | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| 80486DX4 | 1 & 2 | 2 & 3 | Open |
|---------------+----------+----------+----------------------|
| P24D | 1 & 2 | 1 & 2 | Open |
|---------------+----------+----------+----------------------|
| P24T | 1 & 2 | 1 & 2 | Open |
|---------------+----------+----------+----------------------|
| CX M9 | 2 & 3 | 1 & 2 | Open |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP20 | JP25 |
|------------+-------+---------------------------------------|
| CX486S | Open | Open |
|------------+-------+---------------------------------------|
| 80486SX | Open | Open |
|------------+-------+---------------------------------------|
| SL80486SX | Open | 1 & 2, 3 & 4, 9 & 10, 11 & 12 |
|------------+-------+---------------------------------------|
| 80486SX2 | Open | Open |
|------------+-------+---------------------------------------|
| SL80486SX2 | Open | 1 & 2, 3 & 4, 9 & 10, 11 & 12 |
|------------+-------+---------------------------------------|
| UMC U5S | Open | Open |
|------------+-------+---------------------------------------|
| CX486DX | 1 & 2 | Open |
|------------+-------+---------------------------------------|
| AM486DX | 1 & 2 | Open |
|------------+-------+---------------------------------------|
| 80486DX | 1 & 2 | Open |
|------------+-------+---------------------------------------|
| SL80486DX | 1 & 2 | 1 & 2, 3 & 4, 9 & 10, 11 & 12 |
|------------+-------+---------------------------------------|
| CX486DX2 | 1 & 2 | Open |
|------------+-------+---------------------------------------|
| CX486DX2-V | 1 & 2 | Open |
|------------+-------+---------------------------------------|
| AM486DX2 | 1 & 2 | Open |
|------------+-------+---------------------------------------|
| 80486DX2 | 1 & 2 | Open |
|------------+-------+---------------------------------------|
| SL80486DX2 | 1 & 2 | 1 & 2, 3 & 4, 9 & 10, 11 & 12 |
|------------+-------+---------------------------------------|
| AM486DX4 | 1 & 2 | Open |
|------------+-------+---------------------------------------|
| 80486DX4 | 1 & 2 | 1 & 2, 3 & 4, 9 & 10, 11 & 12 |
|------------+-------+---------------------------------------|
| P24D | 1 & 2 | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, |
| | | 11 & 12, 13 & 14, 15 & 16 |
|------------+-------+---------------------------------------|
| P24T | 1 & 2 | 1 & 2, 3 & 4, 9 & 10 |
|------------+-------+---------------------------------------|
| CX M9 | 1 & 2 | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, |
| | | 11 & 12, 15 & 16 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP37 | JP41 |
|------------+--------------------------------+--------------|
| CX486S | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 | 2 & 3 |
| | & 10 11 & 12 | |
|------------+--------------------------------+--------------|
| 80486SX | Open | 2 & 3 |
|------------+--------------------------------+--------------|
| SL80486SX | Open | 2 & 3 |
|------------+--------------------------------+--------------|
| 80486SX2 | Open | 2 & 3 |
|------------+--------------------------------+--------------|
| SL80486SX2 | Open | 2 & 3 |
|------------+--------------------------------+--------------|
| UMC U5S | Open | 2 & 3 |
|------------+--------------------------------+--------------|
| CX486DX | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 | 1 & 2, 3 & 4 |
| | & 10, 11 & 12 | |
|------------+--------------------------------+--------------|
| AM486DX | Open | 1 & 2, 3 & 4 |
|------------+--------------------------------+--------------|
| 80486DX | Open | 1 & 2, 3 & 4 |
|------------+--------------------------------+--------------|
| SL80486DX | Open | 1 & 2, 3 & 4 |
|------------+--------------------------------+--------------|
| CX486DX2 | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 | 1 & 2, 3 & 4 |
| | & 10, 11 & 12 | |
|------------+--------------------------------+--------------|
| CX486DX2-V | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 | 1 & 2, 3 & 4 |
| | & 10, 11 & 12 | |
|------------+--------------------------------+--------------|
| AM486DX2 | Open | 1 & 2, 3 & 4 |
|------------+--------------------------------+--------------|
| 80486DX2 | Open | 1 & 2, 3 & 4 |
|------------+--------------------------------+--------------|
| SL80486DX2 | Open | 1 & 2, 3 & 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION (CON’T) |
|------------------------------------------------------------|
| Type | JP37 | JP41 |
|------------------+------------------+----------------------|
| AM486DX4 | Open | 1 & 2, 3 & 4 |
|------------------+------------------+----------------------|
| 80486DX4 | Open | 1 & 2, 3 & 4 |
|------------------+------------------+----------------------|
| P24D | Open | 1 & 2, 3 & 4 |
|------------------+------------------+----------------------|
| P24T | Open | 1 & 2, 3 & 4 |
|------------------+------------------+----------------------|
| CX M9 | 5 & 6 | 1 & 2, 3 & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU MULTIPLIER SELECTION (DX4 & CX M9 ONLY) |
|------------------------------------------------------------|
| Multiplier | JP21 |
|----------------------------+-------------------------------|
| 2x | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 2.5x | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 3x | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP26 | JP32 |
|---------+--------------------+-----------------------------|
| 3.15v | Pins 1 & 2 closed | Pins 1 & 2, 4 & 5, 7 & 8 |
| | | closed |
|---------+--------------------+-----------------------------|
| 3.3v | Pins 3 & 4 closed | Pins 1 & 2, 4 & 5, 7 & 8 |
| | | closed |
|---------+--------------------+-----------------------------|
| 3.45v | Pins 5 & 6 closed | Pins 1 & 2, 4 & 5, 7 & 8 |
| | | closed |
|---------+--------------------+-----------------------------|
| 3.6v | Pins 7 & 8 closed | Pins 1 & 2, 4 & 5, 7 & 8 |
| | | closed |
|---------+--------------------+-----------------------------|
| 4v | Pins 9 & 10 closed | Pins 1 & 2, 4 & 5, 7 & 8 |
| | | closed |
|---------+--------------------+-----------------------------|
| 5v | N/A | Pins 2 & 3, 5 & 6, 8 & 9 |
| | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS WAIT STATE SELECTION |
|------------------------------------------------------------|
| Setting | JP44 |
|----------------------------+-------------------------------|
| 0 | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 1 | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP47 |
|----------------------------+-------------------------------|
| <= 33MHz | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| >33 MHz | Pins 2 & 3 closed |
+------------------------------------------------------------+