KADATCO CO., LTD.
AM-538
| Device Type | Mainboard | 
| Processor | CX 6X86/IBM 6X86/CX 686MX/IBM 6X86MX/AM K5/AM K6/Pentium | 
| Processor Speed | 75/90/100/120/133/150/166/180/200/233MHz | 
| Chip Set | VIA | 
| Video Chip Set | None | 
| Maximum Onboard Memory | 256MB (EDO & SDRAM supported) | 
| Maximum Video Memory | None | 
| Cache | 256/512KB | 
| BIOS | Award | 
| Dimensions | 254mm x 218mm | 
| I/O Options | 32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), USB connector | 
| NPU Options | None | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Power LED & keylock | CN1/pins 1 - 5 | IDE interface 1 | CN5 | 
| Speaker | CN1/pins 7 - 10 | IDE interface 2 | CN6 | 
| IDE interface LED | CN1/pins 12 & 24 | Floppy drive interface | CN7 | 
| Green PC connector | CN1/pins 17 & 18 | Serial port 2 | CN8 | 
| Reset switch | CN1/pins 21 & 22 | Parallel port | CN9 | 
| Serial port 1 | CN3 | USB connector | J3 | 
| PS/2 mouse interface | CN4 | 32-bit PCI slots | PC1 – PC4 | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Label | Position | |
| » | CMOS memory normal operation | JBAT | Pins 1 & 2 closed | 
| CMOS memory clear | JBAT | Pins 2 & 3 closed | |
| » | Factory configured - do not alter | JCK4 | Unidentified | 
| » | Factory configured - do not alter | J1 | Unidentified | 
| » | Factory configured - do not alter | J2 | Unidentified | 
| » | Factory configured - do not alter | CN2 | Unidentified | 
| SIMM CONFIGURATION | |
| Size | Bank 0 | 
| 4MB | (2) 512K x 36 | 
| 8MB | (2) 1M x 36 | 
| 16MB | (2) 2M x 36 | 
| 32MB | (2) 4M x 36 | 
| 64MB | (2) 8M x 36 | 
| 128MB | (2) 16M x 36 | 
| 256MB | (2) 32M x 36 | 
| Note: Board accepts EDO memory. | |
| DIMM CONFIGURATION | ||
| Size | Bank 1 | Bank 2 | 
| 8MB | (1) 1M x 64 | None | 
| 16MB | (1) 2M x 64 | None | 
| 16MB | (1) 1M x 64 | (1) 1M x 64 | 
| 24MB | (1) 2M x 64 | (1) 1M x 64 | 
| 32MB | (1) 4M x 64 | None | 
| 32MB | (1) 2M x 64 | (1) 2M x 64 | 
| 40MB | (1) 4M x 64 | (1) 1M x 64 | 
| DIMM CONFIGURATION (CON’T) | ||
| Size | Bank 0 | Bank 1 | 
| 48MB | (1) 4M x 64 | (1) 2M x 64 | 
| 64MB | (1) 8M x 64 | None | 
| 64MB | (1) 4M x 64 | (1) 4M x 64 | 
| 72MB | (1) 8M x 64 | (1) 1M x 64 | 
| 80MB | (1) 8M x 64 | (1) 2M x 64 | 
| 96MB | (1) 8M x 64 | (1) 4M x 64 | 
| 128MB | (1) 16M x 64 | None | 
| 128MB | (1) 8M x 64 | (1) 8M x 64 | 
| 136MB | (1) 16M x 64 | (1) 1M x 64 | 
| 144MB | (1) 16M x 64 | (1) 2M x 64 | 
| 160MB | (1) 16M x 64 | (1) 4M x 64 | 
| 192MB | (1) 16M x 64 | (1) 8M x 64 | 
| 256MB | (1) 16M x 64 | (1) 16M x 64 | 
| Note: Board accepts SDRAM memory. | ||
| DIMM VOLTAGE CONFIGURATION | |||
| Voltage | JACK1 | JACK2 | |
| » | 3.3v | Pins 1 & 2 closed | Pins 1 & 2 closed | 
| 5v | Pins 2 & 3 closed | Pins 2 & 3 closed | |
| CACHE CONFIGURATION | 
| Note: The location of the 256KB/512KB is unidentified. | 
| CPU SPEED SELECTION (CX 6X86) | ||||||||
| CPU speed | Clock speed | Multiplier | JBF1 | JBF2 | JBF3 | JCK5 | JCK6 | JCK7 | 
| 120MHz | 50MHz | 2x | 1 & 2 | 2 & 3 | Open | 2 & 3 | 2 & 3 | 2 & 3 | 
| 133MHz | 55MHz | 2x | 1 & 2 | 2 & 3 | Open | 2 & 3 | 2 & 3 | 1 & 2 | 
| 150MHz | 60MHz | 2x | 1 & 2 | 2 & 3 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 166MHz | 66MHz | 2x | 1 & 2 | 2 & 3 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 200MHz | 75MHz | 2x | 1 & 2 | 2 & 3 | Open | 1 & 2 | 2 & 3 | 1 & 2 | 
| Note: Pins designated should be in the closed position. | ||||||||
| CPU SPEED SELECTION (IBM 6X86) | ||||||||
| CPU speed | Clock speed | Multiplier | JBF1 | JBF2 | JBF3 | JCK5 | JCK6 | JCK7 | 
| 166MHz | 66MHz | 2.5x | 1 & 2 | 2 & 3 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 200MHz | 75MHz | 2x | 1 & 2 | 2 & 3 | Open | 1 & 2 | 2 & 3 | 1 & 2 | 
| Note: Pins designated should be in the closed position. | ||||||||
| CPU SPEED SELECTION (CX 6X86MX) | ||||||||
| CPU speed | Clock speed | Multiplier | JBF1 | JBF2 | JBF3 | JCK5 | JCK6 | JCK7 | 
| 166MHz | 60MHz | 2.5x | 1 & 2 | 1 & 2 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 200MHz | 66MHz | 3x | 1 & 2 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 233MHz | 75MHz | 2.5x | 1 & 2 | 1 & 2 | Open | 1 & 2 | 2 & 3 | 1 & 2 | 
| Note: Pins designated should be in the closed position. | ||||||||
| CPU SPEED SELECTION (IBM 6X86MX) | ||||||||
| CPU speed | Clock speed | Multiplier | JBF1 | JBF2 | JBF3 | JCK5 | JCK6 | JCK7 | 
| 166MHz | 60MHz | 2.5x | 1 & 2 | 1 & 2 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 200MHz | 66MHz | 3x | 1 & 2 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| Note: Pins designated should be in the closed position. | ||||||||
| CPU SPEED SELECTION (AM K5) | ||||||||
| CPU speed | Clock speed | Multiplier | JBF1 | JBF2 | JBF3 | JCK5 | JCK6 | JCK7 | 
| 75MHz | 50MHz | 1.5x | 2 & 3 | 2 & 3 | Open | 2 & 3 | 2 & 3 | 2 & 3 | 
| 90MHz | 60MHz | 1.5x | 2 & 3 | 2 & 3 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 100MHz | 66MHz | 1.5x | 2 & 3 | 2 & 3 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 120MHz | 60MHz | 2x | 2 & 3 | 2 & 3 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 133MHz | 66MHz | 2x | 2 & 3 | 2 & 3 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 150MHz | 60MHz | 2.5x | 1 & 2 | 2 & 3 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 166MHz | 66MHz | 2.5x | 1 & 2 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| Note: Pins designated should be in the closed position. | ||||||||
| CPU SPEED SELECTION (AM K6) | ||||||||
| CPU speed | Clock speed | Multiplier | JBF1 | JBF2 | JBF3 | JCK5 | JCK6 | JCK7 | 
| 166MHz | 66MHz | 2.5x | 1 & 2 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 200MHz | 66MHz | 3x | 2 & 3 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 233MHz | 66MHz | 3.5x | 2 & 3 | 2 & 3 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| Note: Pins designated should be in the closed position. | ||||||||
| CPU SPEED SELECTION (INTEL) | ||||||||
| CPU speed | Clock speed | Multiplier | JBF1 | JBF2 | JBF3 | JCK5 | JCK6 | JCK7 | 
| 75MHz | 50MHz | 1.5x | 2 & 3 | 2 & 3 | Open | 2 & 3 | 2 & 3 | 2 & 3 | 
| 90MHz | 60MHz | 1.5x | 2 & 3 | 2 & 3 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 100MHz | 66MHz | 1.5x | 2 & 3 | 2 & 3 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 120MHz | 60MHz | 2x | 1 & 2 | 2 & 3 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 133MHz | 66MHz | 2x | 1 & 2 | 2 & 3 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 150MHz | 60MHz | 2.5x | 1 & 2 | 1 & 2 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 166MHz | 66MHz | 2.5x | 1 & 2 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 180MHz | 60MHz | 3x | 2 & 3 | 1 & 2 | Open | 1 & 2 | 2 & 3 | 2 & 3 | 
| 200MHz | 66MHz | 3x | 2 & 3 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| Note: Pins designated should be in the closed position. | ||||||||
| CPU SPEED SELECTION (IMTEL MMX) | ||||||||
| CPU speed | Clock speed | Multiplier | JBF1 | JBF2 | JBF3 | JCK5 | JCK6 | JCK7 | 
| 166MHz | 66MHz | 2.5x | 1 & 2 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 200MHz | 66MHz | 3x | 2 & 3 | 1 & 2 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| 233MHz | 66MHz | 3.5x | 2 & 3 | 2 & 3 | Open | 2 & 3 | 1 & 2 | 2 & 3 | 
| Note: Pins designated should be in the closed position. | ||||||||
| CPU VOLTAGE SELECTION | ||||
| Voltage | JCK1 | JCK2 | JCK3 | |
| 1.8v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 1.9v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.0v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.1v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.2v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.3v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.4v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.5v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.6v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.7v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.8v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 2.9v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 3.0v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 3.1v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| 3.2v | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed | |
| » | 3.3v | Pins 2 & 3 closed | Pins 2 & 3 closed | Pins 2 & 3 closed | 
| 3.4v | Pins 2 & 3 closed | Pins 2 & 3 closed | Pins 2 & 3 closed | |
| 3.5v | Pins 2 & 3 closed | Pins 2 & 3 closed | Pins 2 & 3 closed | |
| CPU VOLTAGE SELECTION | ||||||
| Voltage | JP1/pins 1 & 2 | JP1/pins 3 & 4 | JP1/pins 5 & 6 | JP1/pins 7 & 8 | JP1/pins 9 &10 | |
| 1.8v | Open | Open | Open | Open | Open | |
| 1.9v | Open | Open | Open | Open | Closed | |
| 2.0v | Open | Open | Open | Closed | Open | |
| 2.1v | Open | Open | Open | Closed | Closed | |
| 2.2v | Open | Open | Closed | Open | Open | |
| 2.3v | Open | Open | Closed | Open | Closed | |
| 2.4v | Open | Open | Closed | Closed | Open | |
| 2.5v | Open | Open | Closed | Closed | Closed | |
| 2.6v | Open | Closed | Open | Open | Open | |
| 2.7v | Open | Closed | Open | Open | Closed | |
| 2.8v | Open | Closed | Open | Closed | Open | |
| 2.9v | Open | Closed | Open | Closed | Closed | |
| 3.0v | Open | Closed | Closed | Open | Open | |
| 3.1v | Open | Closed | Closed | Open | Closed | |
| 3.2v | Open | Closed | Closed | Closed | Open | |
| » | 3.3v | Open | Closed | Closed | Closed | Closed | 
| 3.4v | Closed | Open | Open | Open | Open | |
| 3.5v | Closed | Open | Open | Open | Closed | |