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# FREE COMPUTER TECHNOLOGY, INC.
486F55
Processor CX486S/AM486SX/80486SX/CX486S2/AM486SX2/80486SX2/
ODP487/80487SX/CX486DX/80486DX/CX486DX2/AM486DX2/
(SL)AM486DX2(WB)/(SL)AM486DX2(WT)/80486DX2/AM486DX4/
(SL)AM486DX4(WB)/(SL)AM486DX4(WT)/80486DX4/P24D/P24CT/
P24C(WB)/P24T
Processor 25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set SIS
Video Chip None
Set
Maximum 256MB
Onboard
Memory
Maximum None
Video
Memory
Cache 128/256/512KB
BIOS Award
Dimensions 254mm x 218mm
I/O 32-bit PCI slots (3), floppy drive interface, green PC
Options connector, IDE interfaces (2), parallel port, serial ports (2)
NPU None
Options
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| Serial port | CN1 | Turbo switch | J2 |
|-------------------+----------+------------------+----------|
| Serial port | CN2 | Green PC | J3 |
| | | connector | |
|-------------------+----------+------------------+----------|
| Parallel port | CN3 | Turbo LED | J4 |
|-------------------+----------+------------------+----------|
| Floppy drive | CN4 | Reset switch | J5 |
| interface | | | |
|-------------------+----------+------------------+----------|
| IDE interface 2 | CN5 | Power LED & | J6 |
| | | keylock | |
|-------------------+----------+------------------+----------|
| IDE interface 1 | CN6 | Speaker | J7 |
|-------------------+----------+------------------+----------|
| IDE interface LED | J1 | 32-bit PCI slots | PC1 - |
| | | | PC3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------+-------+----------------|
| » | CMOS memory normal operation | JP2 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | CMOS clear | JP2 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | BIOS type select EPROM | JP3 | Open |
|---+-------------------------------+-------+----------------|
| | Flash BIOS type select 12v | JP3 | Pins 1 & 2, 4 |
| | | | & 5 closed |
|---+-------------------------------+-------+----------------|
| | Flash BIOS type select 5v | JP3 | Pins 2 & 3, 4 |
| | | | & 5 closed |
|---+-------------------------------+-------+----------------|
| » | Parallel port IRQ select IRQ7 | JP6 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Parallel port IRQ select IRQ5 | JP6 | Pins 2 & 3 |
| | | | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | None | (1) 512K x | None | (1) 512K x |
| | | 36 | | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 512K x | None | (1) 512K x | None |
| | 36 | | 36 | |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 512K x | None | None | (1) 512K x |
| | 36 | | | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | None | (1) 512K x | None | (1) 512K x |
| | | 36 | | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 256K x | (1) 256K x | None | (1) 512K x |
| | 36 | 36 | | 36 |
|------+-------------+-------------+------------+------------|
| 4MB | None | (1) 512K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 7MB | (1) 1M x 36 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 2M x 36 | None | None | (1) 512K x |
| | | | | 36 |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 512K x | None | None | (1) 2M x |
| | 36 | | | 36 |
|------+-------------+-------------+------------+------------|
| 10MB | None | (1) 2M x 36 | None | (1) 512K x |
| | | | | 36 |
|------+-------------+-------------+------------+------------|
| 10MB | None | (1) 512K x | None | (1) 2M x |
| | | 36 | | 36 |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 36 | (1) 1M x 36 | None | (1) 512K x |
| | | | | 36 |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 256K x | (1) 256K x | None | (1) 2M x |
| | 36 | 36 | | 36 |
|------+-------------+-------------+------------+------------|
| 13MB | (1) 256K x | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | 36 | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x | (1) 1M x |
| | | | 36 | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | None | (1) 2M x 36 | None | (1) 2M x |
| | | | | 36 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 36 | None | (1) 2M x | None |
| | | | 36 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 2M x 36 | None | None | (1) 2M x |
| | | | | 36 |
|-------+-------------+------------+------------+------------|
| 16MB | None | (1) 2M x | None | (1) 2M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 16MB | (1) 1M x 36 | (1) 1M x | None | (1) 2M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 16MB | None | (1) 2M x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 19MB | (1) 4M x 36 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 28MB | (1) 4M x 36 | (1) 1M x | (1) 1M x | (1) 1M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 34MB | (1) 8M x 36 | None | None | (1) 512K x |
| | | | | 36 |
|-------+-------------+------------+------------+------------|
| 34MB | (1) 512K x | None | None | (1) 8M x |
| | 36 | | | 36 |
|-------+-------------+------------+------------+------------|
| 34MB | None | (1) 8M x | None | (1) 512K x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 34MB | None | (1) 512K x | None | (1) 8M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 34MB | (1) 4M x 36 | (1) 4M x | None | (1) 512K x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 34MB | (1) 256K x | (1) 256K x | None | (1) 8M x |
| | 36 | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 8M x 36 | None | None | (1) 2M x |
| | | | | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 2M x 36 | None | None | (1) 8M x |
| | | | | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | None | (1) 8M x | None | (1) 2M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | None | (1) 2M x | None | (1) 8M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 4M x 36 | (1) 4M x | None | (1) 2M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 40MB | (1) 1M x 36 | (1) 1M x | None | (1) 8M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 49MB | (1) 256K x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 52MB | (1) 1M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 36 | None | (1) 8M x | None |
| | | | 36 | |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 8M x 36 | None | None | (1) 8M x |
| | | | | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | None | (1) 8M x | None | (1) 8M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | (1) 4M x 36 | (1) 4M x | None | (1) 8M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 64MB | None | (1) 8M x | (1) 4M x | (1) 4M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 67MB | (1) 16M x | (1) 256K x | (1) 256K x | (1) 256K x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 76MB | (1) 16M x | (1) 1M x | (1) 1M x | (1) 1M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 112MB | (1) 16M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 130MB | (1) 16M x | (1) 16M x | None | (1) 512K x |
| | 36 | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 130MB | (1) 32M x | None | None | (1) 512K x |
| | 36 | | | 36 |
|-------+-------------+------------+------------+------------|
| 130MB | (1) 512K x | None | None | (1) 32M x |
| | 36 | | | 36 |
|-------+-------------+------------+------------+------------|
| 130MB | None | (1) 32M x | None | (1) 512K x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 130MB | None | (1) 512K x | None | (1) 32M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 130MB | (1) 256K x | (1) 256K x | None | (1) 32M x |
| | 36 | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 136MB | (1) 16M x | (1) 16M x | None | (1) 2M x |
| | 36 | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 136MB | (1) 32M x | None | None | (1) 2M x |
| | 36 | | | 36 |
|-------+-------------+------------+------------+------------|
| 136MB | (1) 2M x 36 | None | None | (1) 32M x |
| | | | | 36 |
|-------+-------------+------------+------------+------------|
| 136MB | None | (1) 32M x | None | (1) 2M x |
| | | 36 | | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 136MB | None | (1) 2M x | None | (1) 32M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 136MB | (1) 1M x 36 | (1) 1M x | None | (1) 32M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 160MB | (1) 16M x | (1) 16M x | None | (1) 8M x |
| | 36 | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 160MB | None | (1) 8M x | None | (1) 32M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 160MB | (1) 32M x | None | None | (1) 8M x |
| | 36 | | | 36 |
|-------+-------------+------------+------------+------------|
| 160MB | None | (1) 32M x | None | (1) 8M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 160MB | None | (1) 8M x | None | (1) 32M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 160MB | (1) 4M x 36 | (1) 4M x | None | (1) 32M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 193MB | (1) 256K x | (1) 16M x | (1) 16M x | (1) 16M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 196MB | (1) 1M x 36 | (1) 16M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 208MB | (1) 4M x 36 | (1) 16M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 256MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 16M x |
| | 36 | 36 | 36 | 36 |
|-------+-------------+------------+------------+------------|
| 256MB | (1) 16M x | (1) 16M x | None | (1) 32M x |
| | 36 | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 256MB | (1) 32M x | None | (1) 32M x | None |
| | 36 | | 36 | |
|-------+-------------+------------+------------+------------|
| 256MB | (1) 32M x | None | None | (1) 32M x |
| | 36 | | | 36 |
|-------+-------------+------------+------------+------------|
| 256MB | None | (1) 32M x | None | (1) 32M x |
| | | 36 | | 36 |
|-------+-------------+------------+------------+------------|
| 256MB | None | (1) 32M x | (1) 16M x | (1) 16M x |
| | | 36 | 36 | 36 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|-----------+--------------+-------------+-------------------|
| 128KB | (4) 32K x 8 | None | (1) 8K/16K/32K x |
| | | | 8 |
|-----------+--------------+-------------+-------------------|
| 256KB (A) | (4) 64K x 8 | None | (1) 16K/32K x 8 |
|-----------+--------------+-------------+-------------------|
| 256KB (B) | (4) 32K x 8 | (4) 32K x 8 | (1) 16K/32K x 8 |
|-----------+--------------+-------------+-------------------|
| 512KB | (4) 128K x 8 | None | (1) 32K x 8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | JP15 | JP16 | JP20 |
|-----------+----------------+---------------+---------------|
| 128KB | Pins 1 & 2 | Pins 1 & 2 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 256KB (A) | Pins 1 & 2 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 256KB (B) | Pins 1 & 2 | Pins 2 & 3 | Pins 1 & 2 |
| | closed | closed | closed |
|-----------+----------------+---------------+---------------|
| 512KB | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
| | closed | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP22 | JP23 |
|--------------------+-------------------+-------------------|
| 25MHz | Open | Open |
|--------------------+-------------------+-------------------|
| 33MHz | Closed | Closed |
|--------------------+-------------------+-------------------|
| 40MHz | Open | Closed |
|--------------------+-------------------+-------------------|
| 50iMHz | Open | Open |
|--------------------+-------------------+-------------------|
| 66iMHz | Closed | Closed |
|--------------------+-------------------+-------------------|
| 75iMHz | Open | Open |
|--------------------+-------------------+-------------------|
| 100iMHz | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | JP8 | JP9 | JP10 | JP11 |
|--------------+-------+----------+-------------+------------|
| CX486S | Open | 1 & 2, 5 | 2 & 3, 5 & | 1 & 2, 4 & |
| | | & 6 | 6, 7 & 8 | 5, 6 & 7 |
|--------------+-------+----------+-------------+------------|
| AM486SX | Open | 1 & 2, 4 | 2 & 3, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6 |
|--------------+-------+----------+-------------+------------|
| 80486SX | Open | 1 & 2, 4 | 2 & 3, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6 |
|--------------+-------+----------+-------------+------------|
| CX486S2 | Open | 1 & 2, 5 | 2 & 3, 5 & | 4 & 5, 6 & |
| | | & 6 | 6, 7 & 8 | 7 |
|--------------+-------+----------+-------------+------------|
| AM486SX2 | Open | 1 & 2, 4 | 2 & 3, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6 |
|--------------+-------+----------+-------------+------------|
| 80486SX2 | Open | 1 & 2, 4 | 2 & 3, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6 |
|--------------+-------+----------+-------------+------------|
| ODP487 | Open | 1 & 2, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| 80487SX | Open | 1 & 2, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| CX486DX | Open | 1 & 2, 5 | 1 & 2, 5 & | 4 & 5, 6 & |
| | | & 6 | 6, 7 & 8 | 7 |
|--------------+-------+----------+-------------+------------|
| 80486DX | Open | 1 & 2, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| CX486DX2 | Open | 1 & 2, 5 | 1 & 2, 5 & | 4 & 5, 6 & |
| | | & 6 | 6, 7 & 8 | 7 |
|--------------+-------+----------+-------------+------------|
| AM486DX2 | Open | 1 & 2, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6 |
|--------------+-------+----------+-------------+------------|
| (SL)AM486DX2 | 2 & 3 | 2 & 3, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| (WB) | | & 5 | 5, 6 & 7 | 6 |
|--------------+-------+----------+-------------+------------|
| (SL)AM486DX2 | 2 & 3 | 2 & 3, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| (WT) | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| 80486DX2 | Open | 1 & 2, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| AM486DX4 | Open | 1 & 2, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6 |
|--------------+-------+----------+-------------+------------|
| (SL)AM486DX4 | Open | 2 & 3, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| (WB) | | & 5 | 5, 6 & 7 | 6 |
|--------------+-------+----------+-------------+------------|
| (SL)AM486DX4 | Open | 2 & 3, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| (WT) | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| 80486DX4 | Open | 1 & 2, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| P24D | Open | 2 & 3, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| P24CT | Open | 2 & 3, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| P24C (WB) | Open | 2 & 3, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|--------------+-------+----------+-------------+------------|
| P24T | Open | 2 & 3, 4 | 1 & 2, 4 & | 3 & 4, 5 & |
| | | & 5 | 5, 6 & 7 | 6, 7 & 8 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU VOLTAGE SELECTION |
|------------------------------------------------------------|
| Voltage | JP17 | JP18 | JP19 |
|-------------------------+-----------+-----------+----------|
| 3.3v (Intel/AMD 3v CPU) | Open | Open | Open |
|-------------------------+-----------+-----------+----------|
| 3.6v (Cyrix 3v CPU) | Closed | Open | Open |
|-------------------------+-----------+-----------+----------|
| 5v | Open | Closed | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL SELECTION |
|------------------------------------------------------------|
| Channel | JP4 | JP5 |
|------------------+--------------------+--------------------|
| » | 1 | Pins 1 & 2 closed | Pins 1 & 2 closed |
|----+-------------+--------------------+--------------------|
| | 3 | Pins 2 & 3 closed | Pins 2 & 3 closed |
+------------------------------------------------------------+