J-MARK COMPUTER CORPORATION
J-542A
| Device Type | Mainboard |
| Processor | CX 6X86/IBM 6X86/CX 6X86MX/AM
K5/AM K6/AM K6-2/ IDT C6/Pentium/Pentium MMX |
| Processor Speed | 90/100/120/133/150/166/200/233/266/300/333/350MHz |
| Chip Set | ALI Aladdin |
| Maximum Onboard Memory | 384MB (EDO & SDRAM supported) |
| Cache | 512KB |
| BIOS | Unidentified |
| Dimensions | 220mm x 210mm |
| I/O Options | 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), IR connector, USB connector, ATX power connector, AGP slot |
CONNECTIONS |
|||
| Purpose | Location |
Purpose | Location |
| AGP slot | AGP |
Chassis fan power | J8 |
| ATX power connector | ATX |
Speaker | J9A |
| USB connector | CN1 |
Reset switch | J9B |
| Serial port 1 | CN2 |
Turbo LED | J9C |
| Parallel port | CN3 |
Power LED & keylock | J9D |
| Floppy drive interface | CN4 |
Turbo switch | J9E |
| IDE interface 2 | CN5 |
Green PC connector | J10/pins 1 & 3 |
| IDE interface 1 | CN6 |
IDE interface LED | J10/pins 2 & 4 |
| Serial port 2 | CN7 |
Soft off power supply | J11/pins 2 & 4 |
| PS/2 mouse interface | J1 |
IR connector | JP2 |
| CPU fan power | J6 |
32-bit PCI slots | PC1 – PC3 |
USER CONFIGURABLE SETTINGS |
|||
Function |
Label |
Position |
|
» |
CMOS memory normal operation | JP4 |
Pins 1 & 2 closed |
| CMOS memory clear | JP4 |
Pins 2 & 3 closed |
|
» |
Factory configured - do not alter | JP7 |
Unidentified |
» |
Factory configured - do not alter | JP9 |
Unidentified |
» |
Factory configured - do not alter | JP10 |
Unidentified |
SIMM CONFIGURATION |
|
Size |
Bank 2 |
16MB |
(2) 2M x 36 |
32MB |
(2) 4M x 36 |
64MB |
(2) 8M x 36 |
128MB |
(2) 16M x 36 |
| Note: Board accepts EDO memory. | |
DIMM CONFIGURATION |
||
Size |
Bank 0 |
Bank 1 |
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 |
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 |
DIMM CONFIGURATION (CON’T) |
||
Size |
Bank 0 |
Bank 1 |
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. | ||
CACHE CONFIGURATION |
||
Size |
Bank 0 |
TAG |
512KB |
(1) 64K x 64 |
Unidentified |
CPU SPEED SELECTION (CX 6X86) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
200MHz |
75MHz |
2x |
On |
On |
Off |
On |
Off |
Off |
CPU SPEED SELECTION (IBM 6X86) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
200MHz |
75MHz |
2x |
On |
On |
Off |
On |
Off |
Off |
CPU SPEED SELECTION (CX 6X86MX) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
166MHz |
60MHz |
2.5x |
On |
On |
On |
On |
On |
Off |
200MHz |
75MHz |
2x |
On |
On |
Off |
On |
Off |
Off |
233MHz |
66MHz |
3x |
Off |
On |
On |
Off |
On |
Off |
300MHz |
66MHz |
3.5x |
Off |
On |
On |
Off |
Off |
Off |
233MHz |
75MHz |
2.5x |
On |
On |
Off |
On |
On |
Off |
266MHz |
83MHz |
2.5x |
Off |
On |
Off |
On |
On |
Off |
333MHz |
100MHz |
2.5x |
Off |
Off |
Off |
On |
On |
Off |
CPU SPEED SELECTION (IDT C6) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
150MHz |
75MHz |
2x |
On |
On |
Off |
On |
Off |
Off |
180MHz |
60MHz |
3x |
On |
On |
On |
Off |
On |
Off |
200MHz |
66MHz |
3x |
Off |
On |
On |
Off |
On |
Off |
CPU SPEED SELECTION (AM K5) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
90MHz |
60MHz |
1.5x |
On |
On |
On |
Off |
Off |
Off |
166MHz |
66MHz |
2.5x |
Off |
On |
On |
On |
On |
Off |
CPU SPEED SELECTION (AM K6) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
166MHz |
66MHz |
2.5x |
Off |
On |
On |
On |
On |
Off |
200MHz |
66MHz |
3x |
Off |
On |
On |
Off |
On |
Off |
233MHz |
66MHz |
3.5x |
Off |
On |
On |
Off |
Off |
Off |
266MHz |
66MHz |
4x |
Off |
On |
On |
On |
Off |
On |
300MHz |
66MHz |
4.5x |
Off |
On |
On |
On |
On |
On |
CPU SPEED SELECTION (AM K6-2) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
300MHz |
100MHz |
3x |
Off |
Off |
Off |
Off |
On |
Off |
333MHz |
95MHz |
3.5x |
On |
Off |
Off |
Off |
On |
Off |
350MHz |
100MHz |
3.5x |
Off |
Off |
Off |
Off |
Off |
Off |
CPU SPEED SELECTION (INTEL) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
90MHz |
60MHz |
1.5x |
On |
On |
On |
Off |
Off |
Off |
100MHz |
66MHz |
1.5x |
Off |
On |
On |
Off |
Off |
Off |
120MHz |
60MHz |
2x |
On |
On |
On |
On |
Off |
Off |
133MHz |
66MHz |
2x |
Off |
On |
On |
On |
Off |
Off |
150MHz |
60MHz |
2.5x |
On |
On |
On |
On |
On |
Off |
166MHz |
66MHz |
2.5x |
Off |
On |
On |
On |
On |
Off |
200MHz |
66MHz |
3x |
Off |
On |
On |
Off |
On |
Off |
CPU SPEED SELECTION (INTEL MMX) |
||||||||
CPU speed |
Clock speed |
Multiplier |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
SW1/5 |
SW1/6 |
166MHz |
66MHz |
2.5x |
Off |
On |
On |
On |
On |
Off |
200MHz |
66MHz |
3x |
Off |
On |
On |
Off |
On |
Off |
233MHz |
66MHz |
3.5x |
Off |
On |
On |
Off |
Off |
Off |
CPU VOLTAGE SELECTION |
|
Voltage |
JP3 |
2.2v |
Pins 1 & 2 closed |
2.8v |
Pins 3 & 4 closed |
2.9v |
Pins 5 & 6 closed |
3.2v |
Pins 7 & 8 closed |
3.45v |
Pins 9 & 10 closed |
3.52v |
Pins 11 & 12 closed |
I/O VOLTAGE SELECTION |
|
Voltage |
JP5 |
3.45v |
Pins 1 & 2 closed |
3.52v |
Pins 3 & 4 closed |