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# ATC/UNITRON COMPUTER & COMPUTER PARTS
486AL
Processor CX486M6/CX486M7/AM486SXL/AM486SX(PLUS)/80486SX/AM486DXL/ 80486DX/ …
80486DX2/AM486DX4(PLUS)/80486DX4/P23S/P24D/Pentium Overdrive …
Processor 25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/100(…
Speed 120(internal)MHz …
Chip Set SIS …
Max. 128MB …
Onboard
DRAM
Cache 128/256/512/1024KB …
BIOS AMI/Award …
Dimensions 280mm x 220mm …
I/O 32-bit VESA local bus slot, floppy drive interface, green PC connect…
Options interface, parallel port, serial ports (2), VGA feature connector, V…
riser slot …
NPU None …
Options
IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| VGA port | CN1 | Green PC | JP51 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Parallel port | CN2 | Green PC | JP59 |
| | | connector | |
|------------------+----------+-------------------+----------|
| Serial port 2 | CN3 | Turbo LED | JP61 |
| | | | pins 1 & |
| | | | 2 |
|------------------+----------+-------------------+----------|
| Serial port 1 | CN4 | Turbo switch | JP61 |
| | | | pins 3 & |
| | | | 4 |
|------------------+----------+-------------------+----------|
| VGA feature | CN5 | Reset switch | JP62 |
| connector | | | |
|------------------+----------+-------------------+----------|
| IDE interface | CN6 | Speaker | JP63 |
|------------------+----------+-------------------+----------|
| Floppy drive | CN7 | Power LED & | JP64 |
| interface | | keylock | |
|------------------+----------+-------------------+----------|
| Power LED | J1 | Riser Card | SL1 |
|------------------+----------+-------------------+----------|
| External battery | JP16 | 32-bit VESA local | SL2 |
| | | bus slot | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| | PS/2 mouse enabled | JP3 | Closed |
|---+----------------------------------+--------+------------|
| | PS/2 mouse disabled | JP3 | Open |
|---+----------------------------------+--------+------------|
| » | VGA BIOS enabled | JP7 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | VGA BIOS disabled | JP7 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP8 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| | Monitor type select color | JP9 | Closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | JP9 | Open |
|---+----------------------------------+--------+------------|
| » | CMOS memory normal operation | JP11 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | JP11 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | ECP DRQ enabled | JP12 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | ECP DRQ disabled | JP12 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | ECP A10 enabled | JP15 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | ECP A10 disabled | JP15 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Parallel port IRQ select IRQ7 | JP17 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Parallel port IRQ select IRQ5 | JP17 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Serial port IRQ select IRQ4 | JP18 | pins 3 & 4 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Serial port IRQ select IRQ3 | JP18 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | JP24 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| | CPU voltage regulator type | JP25 | pins 1 & 2 |
| | select LT1085 | | closed |
|---+----------------------------------+--------+------------|
| | CPU voltage regulator type | JP25 | pins 2 & 3 |
| | select LT1085-3.3 | | closed |
|---+----------------------------------+--------+------------|
| | CPU voltage regulator type | JP27 | Closed |
| | select auto | | |
|---+----------------------------------+--------+------------|
| | CPU voltage regulator type | JP27 | Open |
| | select manual | | |
|---+----------------------------------+--------+------------|
| » | IDE interface enabled | JP32 | Open |
|---+----------------------------------+--------+------------|
| | IDE interface disabled | JP32 | Closed |
|---+----------------------------------+--------+------------|
| » | CPU clock = CLKIN | JP47 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | CPU clock delayed for CLKIN | JP47 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | Internal clock select CLKIN | JP50 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Internal clock select 1/2 CLKIN | JP50 | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION 1 |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 256K x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (4) 1M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (4) 16M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 65MB | (4) 256K x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 68MB | (4) 1M x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 72MB | (4) 1M x 9 | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (4) 4M x 9 | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 96MB | (4) 4M x 9 | (1) 4M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 128MB | (4) 16M x 9 | (1) 16M x 36 | NONE |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION 2 |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | NONE | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | NONE | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 1M x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | NONE | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | NONE | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 4M x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 20MB | NONE | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 4M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 8M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 36MB | (4) 4M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | NONE | (1) 1M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | NONE | (1) 4M x 36 | (1) 8M x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION 2 (CON'T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 64MB | NONE | (1) 8M x 36 | (1) 8M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | NONE | (1) 16M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 65MB | NONE | (1) 256K x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 68MB | NONE | (1) 1M x 36 | (1) 16M x 36 |
|------------+---------------+---------------+---------------|
| 72MB | (4) 16M x 9 | (4) 1M x 9 | (4) 1M x 9 |
|------------+---------------+---------------+---------------|
| 80MB | NONE | (4) 4M x 9 | (4) 16M x 9 |
|------------+---------------+---------------+---------------|
| 96MB | (4) 16M x 9 | (4) 4M x 9 | (4) 4M x 9 |
|------------+---------------+---------------+---------------|
| 128MB | NONE | (4) 16M x 9 | (4) 16M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Configuration | JP54 | JP55 | JP56 |
|---------------+------------------+------------+------------|
| 1 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|---------------+------------------+------------+------------|
| 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|--------------+---------------+---------------+-------------|
| 128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
|--------------+---------------+---------------+-------------|
| 256KB (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
|--------------+---------------+---------------+-------------|
| 256KB (B) | (4) 64K x 8 | NONE | (1) 32K x 8 |
|--------------+---------------+---------------+-------------|
| 512KB (A) | (4) 64K x 8 | (4) 64K x 8 | (1) 32K x 8 |
|--------------+---------------+---------------+-------------|
| 512KB (B) | (4) 128K x 8 | NONE | (1) 32K x 8 |
|--------------+---------------+---------------+-------------|
| 1MB | (4) 128K x 8 | (4) 128K x 8 | (1) 64K x 8 |
|------------------------------------------------------------|
| Note: The orientation of Banks 0 & 1 and TAG are |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP33 | JP34 | JP35 | JP36 | JP52 | JP53 |
|-------+-------+-------+----------+---------+-------+-------|
| 128KB | 1 & 2 | 1 & 2 | Any | Any | 1 & 2 | 1 & 2 |
| | | | setting | setting | | |
|-------+-------+-------+----------+---------+-------+-------|
| 256KB | 2 & 3 | 2 & 3 | Any | Any | 1 & 2 | 2 & 3 |
| (A) | | | setting | setting | | |
|-------+-------+-------+----------+---------+-------+-------|
| 256KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
| (B) | | | | | | |
|-------+-------+-------+----------+---------+-------+-------|
| 512KB | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
| (A) | | | | | | |
|-------+-------+-------+----------+---------+-------+-------|
| 512KB | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 |
| (B) | | | | | | |
|-------+-------+-------+----------+---------+-------+-------|
| 1MB | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| Type | JP19 | JP20 | JP21 | JP22 | JP23 |
|-----------------+--------+--------+--------+-------+-------|
| CX486M6 | N/A | 2 & 3 | 1 & 2 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| AM486SXL | 1 & 2 | N/A | 2 & 3 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| AM486SX(PLUS) | 4 & 5 | N/A | 1 & 2 | 2 & 3 | 2 & 3 |
|-----------------+--------+--------+--------+-------+-------|
| 80486SX | 1 & 2 | N/A | 1 & 2 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| AM486DXL | 1 & 2 | N/A | 2 & 3 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| CX486M7 | N/A | 2 & 3 | 1 & 2 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| 80486DX | 1 & 2 | N/A | 1 & 2 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| 80486DX2 | 1 & 2 | N/A | 1 & 2 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| AM486DX4(PLUS) | 4 & 5 | N/A | 1 & 2 | 2 & 3 | 2 & 3 |
|-----------------+--------+--------+--------+-------+-------|
| 80486DX4 | 1 & 2 | N/A | 1 & 2 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| P23S | 1 & 2 | N/A | 1 & 2 | 2 & 3 | N/A |
|-----------------+--------+--------+--------+-------+-------|
| P24D | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
|-----------------+--------+--------+--------+-------+-------|
| P24T | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | N/A |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Type | JP38 | JP39 | JP40 | JP41 | JP42 |
|----------------+-------+-------+---------+-------+---------|
| CX486M6 | 2 & 3 | 2 & 3 | N/A | 1 & 2 | 2 & 3 |
|----------------+-------+-------+---------+-------+---------|
| AM486SXL | N/A | 3 & 4 | 1 & 2 | 3 & 4 | 2 & 3 |
|----------------+-------+-------+---------+-------+---------|
| AM486SX(PLUS) | 4 & 5 | N/A | N/A | 2 & 3 | 2 & 3 |
|----------------+-------+-------+---------+-------+---------|
| 80486SX | 4 & 5 | N/A | N/A | 2 & 3 | 2 & 3 |
|----------------+-------+-------+---------+-------+---------|
| AM486DXL | N/A | 3 & 4 | 1 & 2, | 3 & 4 | 1 & 2, |
| | | | 3 & 4 | | 3 & 4 |
|----------------+-------+-------+---------+-------+---------|
| CX486M7 | 2 & 3 | 2 & 3 | 3 & 4 | 1 & 2 | 1 & 2, |
| | | | | | 3 & 4 |
|----------------+-------+-------+---------+-------+---------|
| 80486DX | 4 & 5 | N/A | 3 & 4 | 2 & 3 | 1 & 2, |
| | | | | | 3 & 4 |
|----------------+-------+-------+---------+-------+---------|
| 80486DX2 | 4 & 5 | N/A | 3 & 4 | 2 & 3 | 1 & 2, |
| | | | | | 3 & 4 |
|----------------+-------+-------+---------+-------+---------|
| AM486DX4(PLUS) | 4 & 5 | N/A | 3 & 4 | 2 & 3 | 1 & 2, |
| | | | | | 3 & 4 |
|----------------+-------+-------+---------+-------+---------|
| 80486DX4 | 4 & 5 | N/A | 3 & 4 | 2 & 3 | 1 & 2, |
| | | | | | 3 & 4 |
|----------------+-------+-------+---------+-------+---------|
| P23S | 4 & 5 | N/A | 3 & 4 | 2 & 3 | 2 & 3 |
|----------------+-------+-------+---------+-------+---------|
| P24D | 4 & 5 | N/A | 3 & 4 | 2 & 3 | 1 & 2, |
| | | | | | 3 & 4 |
|----------------+-------+-------+---------+-------+---------|
| P24T | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2, |
| | | | | | 3 & 4 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CON'T) |
|------------------------------------------------------------|
| Type | JP43 | JP44 | JP45 | JP46 | JP48 | JP49 |
|-----------------+-------+------+------+------+------+------|
| CX486M6 | N/A | N/A | 2 & | N/A | N/A | N/A |
| | | | 3 | | | |
|-----------------+-------+------+------+------+------+------|
| AM486SXL | N/A | N/A | 4 & | N/A | N/A | N/A |
| | | | 5 | | | |
|-----------------+-------+------+------+------+------+------|
| AM486SX(PLUS) | N/A | N/A | 3 & | N/A | N/A | N/A |
| | | | 4 | | | |
|-----------------+-------+------+------+------+------+------|
| 80486SX | N/A | N/A | 3 & | N/A | 2 & | 1 & |
| | | | 4 | | 3 | 2 |
|-----------------+-------+------+------+------+------+------|
| AM486DXL | N/A | N/A | 4 & | N/A | 1 & | 2 & |
| | | | 5 | | 2 | 3 |
|-----------------+-------+------+------+------+------+------|
| CX486M7 | N/A | N/A | 2 & | N/A | 1 & | 2 & |
| | | | 3 | | 2 | 3 |
|-----------------+-------+------+------+------+------+------|
| 80486DX | 2 & 3 | N/A | 3 & | N/A | 2 & | 1 & |
| | | | 4 | | 3 | 2 |
|-----------------+-------+------+------+------+------+------|
| 80486DX2 | 2 & 3 | N/A | 3 & | N/A | 2 & | 1 & |
| | | | 4 | | 3 | 2 |
|-----------------+-------+------+------+------+------+------|
| AM486DX4(PLUS) | 2 & 3 | N/A | 3 & | N/A | 1 & | 1 & |
| | | | 4 | | 2 | 2 |
|-----------------+-------+------+------+------+------+------|
| 80486DX4 | 1 & 2 | N/A | 3 & | N/A | 2 & | 1 & |
| | | | 4 | | 3 | 2 |
|-----------------+-------+------+------+------+------+------|
| P23S | N/A | N/A | 3 & | N/A | N/A | N/A |
| | | | 4 | | | |
|-----------------+-------+------+------+------+------+------|
| P24D | 1 & | N/A | 1 & | N/A | 1 & | 1 & |
| | 2, or | | 2, 3 | | 2 | 2 |
| | 2 & 3 | | & 4 | | | |
|-----------------+-------+------+------+------+------+------|
| P24T | N/A | N/A | 3 & | 1 & | 1 & | 1 & |
| | | | 4 | 2, | 2 | 2 |
| | | | | or 2 | | |
| | | | | & 3 | | |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
| This board also accepts SL-series CPUs & am486dxl2, but no |
| jumper settings are listed. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED CONFIGURATION |
|------------------------------------------------------------|
| Speed | JP37 |
|----------------------------+-------------------------------|
| 25MHz | pins 1 & 2, 5 & 6 closed |
|----------------------------+-------------------------------|
| 33MHz | pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| 40MHz | pins 5 & 6 closed |
|----------------------------+-------------------------------|
| 50iMHz | pins 1 & 2, 5 & 6 closed |
|----------------------------+-------------------------------|
| 50MHz | pins 3 & 4 closed |
|----------------------------+-------------------------------|
| 66iMHz | pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| 75iMHz | pins 1 & 2, 5 & 6 closed |
|----------------------------+-------------------------------|
| 80iMHz | pins 5 & 6 closed |
|----------------------------+-------------------------------|
| 100iMHz | pins 1 & 2, 3 & 4 closed |
|----------------------------+-------------------------------|
| 120iMHz | pins 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE CONFIGURATION |
|------------------------------------------------------------|
| Voltage | JP26 |
|----------------------------+-------------------------------|
| Auto detect | Open |
|----------------------------+-------------------------------|
| 3.3v | pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 5v | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| Wait states | JP58 |
|------------------------------+-----------------------------|
| » | 0 wait states | pins 1 & 2 closed |
|---+--------------------------+-----------------------------|
| » | 1 wait state | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VL BUS SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | JP57 |
|----------------------------+-------------------------------|
| » | <= 33MHz | pins 1 & 2 closed |
|---+------------------------+-------------------------------|
| » | > 33MHz | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CONFIGURATION |
|------------------------------------------------------------|
| DMA | JP13 | JP14 |
|------------------+--------------------+--------------------|
| » | DMA 1 | pins 2 & 3 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| » | DMA 3 | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY ENHANCED MODE CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP28 | JP29 |
|------------------------+-----------------+-----------------|
| » | Enabled | Closed | Closed |
|----+-------------------+-----------------+-----------------|
| » | Disabled | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| KEYBOARD CONFIGURATION |
|------------------------------------------------------------|
| Type | JP1 | JP2 | JP5 | JP6 |
|------+--------+--------+-----------------+-----------------|
| AT | Open | Open | pins 2 & 3 | pins 2 & 3 |
| | | | closed | closed |
|------+--------+--------+-----------------+-----------------|
| PS/2 | Closed | Closed | pins 1 & 2 | pins 1 & 2 |
| | | | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MEDIA DETECT CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP30 | JP31 |
|------------------------+-----------------+-----------------|
| » | Enabled | Closed | Closed |
|---+--------------------+-----------------+-----------------|
| » | Disabled | Open | Open |
+------------------------------------------------------------+
+----------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|----------------------------------------------|
| Note: The location of pin 1 is unidentified. |
+----------------------------------------------+
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