ENPC TECHNOLOGY CORPORATION

EP-PS21 (REV. A)
Device Type Mainboard
Processor CX 6X86MX/CX M2/AM K5/AM K6/AM K6-2/Pentium/Pentium MMX
Processor Speed 90/100/120/133/150/166/180/200/233/266/300/333/350/366/380/400/450/475MHz
Chip Set SIS 530
Video Chip Set SIS
Audio Chip Set ESS
Maximum Onboard Memory 768MB (SDRAM supported)
Maximum Video Memory 8MB
Maximum Audio Memory Unidentified
Cache 512KB
BIOS Award
Dimensions 220mm x 240mm
I/O Options 32-bit PCI slots (3), floppy drive interface, game/MIDI port, IDE interfaces (2), parallel port, PS/2 mouse port, serial port, serial interface, VGA port, IR connector, USB ports (2), ATX power connector, AGP slot, line in, line out, microphone in, audio in - CD-ROMs (2), Wake-on-LAN connector


CONNECTIONS

Purpose

Location

Purpose

Location

ATX power connector

ATX

IDE interface 2 CN14
PS/2 mouse port CN1 IDE interface 1 CN15
USB port 1 CN2 Floppy drive interface CN16
USB port 2 CN3 Reset switch CN17/Pins 1 & 2
Parallel port CN4 Power switch CN17/Pins 5 & 6
Serial port CN5 ACPI LED CN17/Pins 7 & 8
VGA port CN6 IDE interface LED CN17/Pins 9 & 10
Game/MIDI port CN7 Speaker CN17/Pins 11-14
Line out CN8 Power LED & keylock CN17/Pins 15-19
Line in CN9 IR connector IR
Microphone in CN10 Audio in - CD-ROM 2 J2
Serial interface CN11 Audio in - CD-ROM 1 J3
CPU fan power CN12 Wake-on-LAN connector J4
Chassis fan power CN13 32-bit PCI slots

PC1 - PC3


USER CONFIGURABLE SETTINGS

Function

Label

Position

»

 Cache toggle mode J1 Open
  Cache linear mode J1 Closed
» CMOS memory normal operation JP7 Pins 2 & 3 closed

 

 CMOS memory clear JP7 Pins 1 & 2 closed


DIMM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

8MB

(1) 1M x 64

None

None

16MB

(1) 1M x 64

(1) 1M x 64

None

16MB

(1) 2M x 64

None

None

24MB

(1) 1M x 64

(1) 1M x 64

(1) 1M x 64

32MB

(1) 2M x 64

(1) 2M x 64

None

32MB

(1) 4M x 64

None

None

32MB

(1) 2M x 64

(1) 1M x 64

(1) 1M x 64

48MB

(1) 2M x 64

(1) 2M x 64

(1) 2M x 64

48MB

(1) 4M x 64

(1) 1M x 64

(1) 1M x 64

64MB

(1) 4M x 64

(1) 4M x 64

None

64MB

(1) 8M x 64

None

None

64MB

(1) 4M x 64

(1) 2M x 64

(1) 2M x 64

80MB

(1) 8M x 64

(1) 1M x 64

(1) 1M x 64

96MB

(1) 4M x 64

(1) 4M x 64

(1) 4M x 64

96MB

(1) 8M x 64

(1) 2M x 64

(1) 2M x 64

128MB

(1) 8M x 64

(1) 8M x 64

None

128MB

(1) 16M x 64

None

None

128MB

(1) 8M x 64

(1) 4M x 64

(1) 4M x 64

144MB

(1) 16M x 64

(1) 1M x 64

(1) 1M x 64

160MB

(1) 16M x 64

(1) 2M x 64

(1) 2M x 64

192MB

(1) 8M x 64

(1) 8M x 64

(1) 8M x 64

192MB

(1) 16M x 64

(1) 4M x 64

(1) 4M x 64

256MB

(1) 16M x 64

(1) 16M x 64

None

256MB

(1) 32M x 64

None

None

256MB

(1) 16M x 64

(1) 8M x 64

(1) 8M x 64

272MB

(1) 32M x 64

(1) 1M x 64

(1) 1M x 64

288MB

(1) 32M x 64

(1) 2M x 64

(1) 2M x 64

320MB

(1) 32M x 64

(1) 4M x 64

(1) 4M x 64

384MB

(1) 16M x 64

(1) 16M x 64

(1) 16M x 64

384MB

(1) 32M x 64

(1) 8M x 64

(1) 8M x 64

512MB

(1) 32M x 64

(1) 32M x 64

None

512MB

(1) 32M x 64

(1) 16M x 64

(1) 16M x 64

768MB

(1) 32M x 64

(1) 32M x 64

(1) 32M x 64
Note:  Board supports SDRAM memory.


CPU SPEED SELECTION

CPU clock speed

SDRAM clock speed FS0 FS1 FS2 SD

66MHz

89MHz Closed Closed Closed Closed

66MHz

66MHz Closed Closed Closed Open

75MHz

75MHz Open Closed Closed Open

83MHz

66MHz Open Closed Closed Closed

83MHz

83MHz Closed Open Closed Open

95MHz

63MHz Closed Open Closed Closed

95MHz

95MHz Open Open Closed Open

100MHz

66MHz Open Open Closed Closed

100MHz

100MHz Closed Closed Open Open

112MHz

75MHz Open Closed Open Closed

112MHz

112MHz Open Closed Open Open


CPU MULTIPLIER SELECTION

Multiplier

BF0 BF1 BF2

1.5x

 Open Open Open

2x

 Closed Open Open

2.5x

 Closed Closed Open

3x

 Open Closed Open
3.5x Open Open Open
4x Closed Open Closed
4.5x Closed Closed Closed
5x Open Closed Closed
5.5x Open Open Closed


3.3V POWER SOURCE SELECTION

Setting

 JP1/Pins 1 & 2 JP1/Pins 3 & 4 JP1/Pins 5 & 6
Power supply Closed Closed Closed
3.3V Open Open Open
Note:   If JP1 is set to Power Supply, the 3.3V power regulator should be removed.
Note:  3.3v setting is dependant on JP5


CPU VOLTAGE SELECTION

Setting

 JP5
3.3V Pins 1 & 2 closed
3.5V Pins 3 & 4 closed
Note:   JP5/Pins 5 & 6 are removed


CPU VOLTAGE SELECTION

Voltage

 VID0 VID1 VID2 VID3 VID4
1.8V Open Closed Open Closed Closed
2.0V Open Closed Closed Closed Closed
2.2V Open Closed Open Open Open
2.5V Closed Open Closed Open Open
2.8V Open Open Open Closed Open
2.9V Closed Open Open Closed Open
3.1V Closed Closed Open Closed Open
3.2V Open Open Closed Closed Open
3.3V Closed Open Closed Closed Open
3.5V Closed Closed Closed Closed Open


MISCELLANEOUS TECHNICAL NOTES

Processor speeds listed include the speeds available for the Cyrix 6X86MX CPU, which is synonymous with the Cyrix M1 CPU.