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# FIRST INTERNATIONAL COMPUTER, INC.
486-GIO-VT
Processor 80486SX/CX486S/486S
Series/80486DX/80486DX2/Pentium Overdrive
Processor 25/33/50(internal)/66(internal)MHz
Speed
Chip Set VIA
Max. Onboard 96MB
DRAM
Cache 64/128/256KB
BIOS AMI/AWARD
Dimensions 330mm x 218mm
I/O Options 32-bit VESA local bus slots (2), floppy drive
interface,
game port, IDE interface, PS/2 mouse port
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| PS/2 mouse | CN1 | IDE interface LED | J8 |
| connector | | | |
|------------------+----------+-------------------+----------|
| Floppy drive | CN4 | Turbo switch | J12 |
| interface | | | |
|------------------+----------+-------------------+----------|
| Game port | CN5 | Turbo LED | J13 |
|------------------+----------+-------------------+----------|
| IDE interface | CN9 | Reset switch | J14 |
|------------------+----------+-------------------+----------|
| PS/2 mouse port | CN11 | Speaker | J15 |
|------------------+----------+-------------------+----------|
| Parallel port | CN12 | Power LED & | J16 |
| | | keylock | |
|------------------+----------+-------------------+----------|
| Serial port 1 | CN13 | Power supply | J17 |
| | | outlet | |
|------------------+----------+-------------------+----------|
| Serial port 2 | CN14 | 32-bit VESA Local | SL15, |
| | | bus slots | SL16 |
|------------------+----------+-------------------+----------|
| External battery | J1 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|----------------------------------------+--------+----------|
|»|Monitor type select mono/EGA/VGA | J2 | Open |
|-+--------------------------------------+--------+----------|
| |Monitor type select color | J2 | Closed |
|-+--------------------------------------+--------+----------|
|»|Internal battery select | J3 |pins 2 & 3|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |External battery select | J3 |pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
|»|Local IDE selection enabled | J4 |pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |Local IDE selection disabled | J4 |pins 2 & 3|
| | | | closed |
|-+--------------------------------------+--------+----------|
|»|Award BIOS select | J7 |pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |AMI BIOS select | J7 |pins 2 & 3|
| | | | closed |
|-+--------------------------------------+--------+----------|
|»|IDE BALE disabled | J9 | Open |
|-+--------------------------------------+--------+----------|
| |IDE BALE enabled | J9 | Closed |
|-+--------------------------------------+--------+----------|
|»|IDE IOCHRDY disabled | J10 | Open |
|-+--------------------------------------+--------+----------|
| |IDE IOCHRDY enabled | J10 | Closed |
|-+--------------------------------------+--------+----------|
|»|Adaptec ISA master installed | J18 | Closed |
|-+--------------------------------------+--------+----------|
| |Adaptec ISA master not installed | J18 | Open |
|-+--------------------------------------+--------+----------|
|»|80486SX/80486SX(SL)/80486DX(SL)/Cx486S| JC6 | Closed |
| |PQFP disable | | |
|-+--------------------------------------+--------+----------|
| |80486SX/80486SX(SL)/80486DX(SL)/Cx486S| JC6 | Open |
| |PQFP enable | | |
|-+--------------------------------------+--------+----------|
|»|IDE enabled | JG |pins 2 & 3|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |IDE disabled | JG |pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
|»|Floppy drive interface enabled | JH |pins 2 & 3|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |Floppy drive interface disabled | JH |pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
|»|Parallel port uni-directional | JI | Closed |
| |(printer) | | |
|-+--------------------------------------+--------+----------|
| |Parallel port bi-directional | JI | Open |
|-+--------------------------------------+--------+----------|
|»|IDE select A26 | JP1 |pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |IDE select IRQ 15 | JP1 |pins 2 & 3|
| | | | closed |
|-+--------------------------------------+--------+----------|
|»|Factory configured - do not alter | JP3 | N/A |
|-+--------------------------------------+--------+----------|
|»|CPU clock select 1X | JX1 |pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |CPU clock select 2X | JX1 |pins 2 & 3|
| | | | closed |
|-+--------------------------------------+--------+----------|
|»|ODP586SX write back select | JT1 |pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |ODP586SX write through select | JT1 |pins 2 & 3|
| | | | closed |
|-+--------------------------------------+--------+----------|
|»|IDE select IRQ 15 |JX2, JP2|pins 1 & 2|
| | | | closed |
|-+--------------------------------------+--------+----------|
| |IDE select SMI |JX2, JP2|pins 2 & 3|
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 1MB | (4) 256K x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 1MB | NONE | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 1MB | NONE | NONE | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 2MB | NONE | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 2MB | (4) 256K x 9 | NONE | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 3MB | (4) 256K x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 4MB | (4) 1M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 4MB | NONE | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 4MB | NONE | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 256K x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | (4) 1M x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 5MB | (4) 1M x 9 | NONE | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 5MB | NONE | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 256K x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 6MB | (4) 1M x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 8MB | (4) 1M x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 8MB | NONE | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 256K x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 1M x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 9MB | (4) 1M x 9 | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 12MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 16MB | (4) 4M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 16MB | NONE | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 16MB | NONE | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (4) 256K x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 17MB | NONE | (1) 256K x 36 | |
|------------+---------------+---------------+---------------|
| 17MB | NONE | (1) 4M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 17MB | (4) 4M x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 17MB | (4) 4M x 9 | NONE | (1) 256K x 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 256K x 9 | (1) 4M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 18MB | (4) 4M x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (4) 1M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (4) 1M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | (4) 4M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 20MB | (4) 4M x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | NONE | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 20MB | NONE | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 256K x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 256K x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 1M x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 1M x 9 | (1) 4M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 4M x 9 | (1) 256K x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 21MB | (4) 4M x 9 | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 1M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 24MB | (4) 4M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 32MB | (4) 4M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 32MB | NONE | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 256K x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 4M x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 33MB | (4) 4M x 9 | (1) 4M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 1M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 4M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 36MB | (4) 4M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 48MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 64MB | (4) 16M x 9 | NONE | NONE |
|------------+---------------+---------------+---------------|
| 65MB | (4) 16M x 9 | (1) 256K x 36 | NONE |
|------------+---------------+---------------+---------------|
| 65MB | (4) 16M x 9 | NONE | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 66MB | (4) 16M x 9 | (1) 256K x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 68MB | (4) 16M x 9 | (1) 1M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 68MB | (4) 16M x 9 | NONE | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 69MB | (4) 16M x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 69MB | (4) 16M x 9 | (1) 1M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 72MB | (4) 16M x 9 | (1) 1M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 80MB | (4) 16M x 9 | (1) 4M x 36 | NONE |
|------------+---------------+---------------+---------------|
| 80MB | (4) 16M x 9 | NONE | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 81MB | (4) 16M x 9 | (1) 256K x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 81MB | (4) 16M x 9 | (1) 4M x 36 | (1) 256K x 36 |
|------------+---------------+---------------+---------------|
| 84MB | (4) 16M x 9 | (1) 1M x 36 | (1) 4M x 36 |
|------------+---------------+---------------+---------------|
| 84MB | (4) 16M x 9 | (1) 4M x 36 | (1) 1M x 36 |
|------------+---------------+---------------+---------------|
| 96MB | (4) 16M x 9 | (1) 4M x 36 | (1) 4M x 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JS1 | JS2 | JS3 |
|-------+-----------------+-----------------+----------------|
| 64KB | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 128KB | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed |
|-------+-----------------+-----------------+----------------|
| 256KB | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION |
|------------------------------------------------------------|
| CPU Type | JC1 | JC2 | JC3 | JC4 | JC5 | JC7 |
|-------------+-------+-----+--------+--------+--------+-----|
| 80486SX | 2 & 3 | 2 & | Open | Open | Closed | 1 & |
| | | 3 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| 80486SX | 2 & 3 | 2 & | Open | Open | Closed | 1 & |
| (SL) | | 3 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| Cx486S | 2 & 3 | 2 & | Closed | Open | Open | 1 & |
| | | 3 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| Cx487S | 1 & 2 | 1 & | Closed | Open | Open | 1 & |
| | | 2 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| Cx486DX | 1 & 2 | 1 & | Closed | Open | Open | 1 & |
| | | 2 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| 80486DX | 1 & 2 | 1 & | Closed | Open | Closed | 1 & |
| | | 2 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| 80486DX | 1 & 2 | 1 & | Closed | Open | Closed | 1 & |
| (SL) | | 2 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| 80486DX2 | 1 & 2 | 1 & | Closed | Open | Closed | 1 & |
| | | 2 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| 80486DX2 | 1 & 2 | 1 & | Closed | Open | Closed | 1 & |
| (SL) | | 2 | | | | 2 |
|-------------+-------+-----+--------+--------+--------+-----|
| Overdrive | 1 & 2 | 1 & | Open | Closed | Open | 2 & |
| | | 2 | | | | 3 |
|------------------------------------------------------------|
| Note:Pins designated are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CONTINUED) |
|------------------------------------------------------------|
| CPU Type | RN21 | RN22 | RN23 |
|--------------------+---------------+-----------+-----------|
| 80486SX | Not installed | Not | Not |
| | | installed | installed |
|--------------------+---------------+-----------+-----------|
| 80486SX (SL) | Not installed | Installed | Not |
| | | | installed |
|--------------------+---------------+-----------+-----------|
| 80486SX (SL) | Installed | Not | Not |
| (PQFP) | | installed | installed |
|--------------------+---------------+-----------+-----------|
| Cx486S | Not installed | Not | Installed |
| | | installed | |
|--------------------+---------------+-----------+-----------|
| Cx486S (PQFP) | Installed | Not | Not |
| | | installed | installed |
|--------------------+---------------+-----------+-----------|
| Cx487S | Not installed | Not | Installed |
| | | installed | |
|--------------------+---------------+-----------+-----------|
| Cx486DX | Not installed | Not | Installed |
| | | installed | |
|--------------------+---------------+-----------+-----------|
| 80486DX | Not installed | Not | Not |
| | | installed | installed |
|--------------------+---------------+-----------+-----------|
| 80486DX (SL) | Not installed | Installed | Not |
| | | | installed |
|--------------------+---------------+-----------+-----------|
| 80486DX (SL) | Installed | Not | Not |
| (PQFP) | | installed | installed |
|--------------------+---------------+-----------+-----------|
| 80486DX2 | Not installed | Not | Not |
| | | installed | installed |
|--------------------+---------------+-----------+-----------|
| 80486DX2 (SL) | Not installed | Installed | Not |
| | | | installed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE CONFIGURATION (CONTINUED) |
|------------------------------------------------------------|
| CPU Type | JCX1 | JCX2 |
|--------------------+------------------+--------------------|
| Cx486S | Closed | pins 2 & 3 closed |
|--------------------+------------------+--------------------|
| All others | Open | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VESA WAIT STATE CONFIGURATION |
|------------------------------------------------------------|
| CPU speed | Wait states | JV2 | JV3 |
|-----------+---------------+-------------------+------------|
| > 33MHz | 0 wait states | pins 1 & 2 closed | pins 1 & 2 |
| | | | closed |
|-----------+---------------+-------------------+------------|
| < 33MHz | 1 wait state | pins 2 & 3 closed | pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| KEYBOARD CONTROLLER CONFIGURATION ||
|-----------------------------------------------------------+|
| Type | JX3 | JX4 ||
|---------------------------------+------------+------------||
| » | External KBC | pins 1 & 2 | pins 1 & 2 ||
| | | closed | closed ||
|---+-----------------------------+------------+------------||
| | Internal KBC with PS/2 | pins 2 & 3 | pins 2 & 3 ||
| | mouse | closed | closed ||
|---+-----------------------------+------------+------------||
| | Internal KBC w/o PS/2 mouse | pins 2 & 3 | pins 1 & 2 ||
| | | closed | closed ||
|---+-----------------------------+------------+------------||
| | Illegal | pins 1 & 2 | pins 2 & 3 ||
| | | closed | closed ||
+------------------------------------------------------------+
+------------------------------------------------------------+
| KEYBOARD CONFIGURATION |
|------------------------------------------------------------|
| Jumper | External | Internal KBC |
| | KBC | |
|-----------+-------------+----------------------------------|
| | JKB 1 | pins 1 & 2 | 1 & 2 | 2 & 3 Award Clear |
| | | | (default) | |
|---+-------+-------------+--------------+-------------------|
| | JKB 2 | pins 1 & 2 | 1 & 2 | 2 & 3 AMI Clear |
| | | | (default) | |
|---+-------+-------------+--------------+-------------------|
| | JKB 3 | pins 1 & 2 | 1 & 2 | 2 & 3 CGA |
| | | | VGA/Mono | |
|------------------------------------------------------------|
| Note: Pins designated are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| IDE SPEED CONFIGURATION (PDC 20230 ONLY) |
|------------------------------------------------------------|
| IDE type | J5 | J6 |
|------------------+--------------------+--------------------|
| » | Speed 2 | pins 1 & 2 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | Speed 1 | pins 1 & 2 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | Speed 0 | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 CONFIGURATION |
|------------------------------------------------------------|
| Port 1 | JA | JB |
|------------------+--------------------+--------------------|
| » | 3F8h | pins 1 & 2 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | 2E8h | pins 2 & 3 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | 3E8h | pins 1 & 2 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | Disable | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 CONFIGURATION |
|------------------------------------------------------------|
| Port 2 | JC | JD |
|------------------+--------------------+--------------------|
| » | 2F8h | pins 2 & 3 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | 3E8h | pins 2 & 3 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | 2E8h | pins 1 & 2 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | Disable | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT CONFIGURATION |
|------------------------------------------------------------|
| LPT 1 | JE | JF |
|------------------+--------------------+--------------------|
| » | 378 | pins 1 & 2 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | 278 | pins 2 & 3 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| | 3BC | pins 2 & 3 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| | Disable | pins 1 & 2 closed | pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK CONFIGURATION (IMI425) |
|------------------------------------------------------------|
| Clock | JK1 | JK2 | JK3 | JK4 |
|-------+-------------+------------+------------+------------|
| 40MHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 50MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 80MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 66MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 66MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 25MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 40MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 50MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|-------+-------------+------------+------------+------------|
| 33MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU CLOCK CONFIGURATION (VT8225N) |
|------------------------------------------------------------|
| Clock | JK1 | JK2 | JK3 | JK4 |
|--------+------------+------------+------------+------------|
| 16MHz | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 8MHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 40MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 20MHz | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50MHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 25MHz | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 80MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 40MHz | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 66MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 33MHz | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 100MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 50MHz | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 8MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 4MHz | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 4MHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 2MHz | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+