ENPC TECHNOLOGY CORPORATION

EP-PT21 (REV. 1.3)
Device Type Mainboard
Processor CX 686MX/CX M2/AM K5/AM K6/Pentium/Pentium MMX/IDT C6
Processor Speed 75/90/100/120/133/150/166/180/200/225/233/240/266/300MHz
Chip Set Intel 430TX
Maximum Onboard Memory 256MB (EDO, & SDRAM supported)
Cache 256/512KB
BIOS AMI/Award
Dimensions 305mm x 210mm
I/O Options 32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), IR connectors (2), USB ports (2), ATX power connector, Program connector, external battery connector


CONNECTIONS

Purpose

Location

Purpose

Location

ATX power connector

ATX

USB port 1 J16
Program connector CN1 PS/2 mouse port J17
External battery connector J1 USB port 2 J18
CPU fan power J5 IR connector (front) J21
IDE interface 1 J6 Speaker J22/Pins 1, 3, 5, 7
IDE interface 2 J7 IDE interface LED J22/Pins 2 & 4
Floppy drive interface J9 Turbo LED J22/Pins 6 & 8
IR connector (rear) J10 Power LED J22/Pins 9, 11, 13
Serial port 1 J11 Power switch J22/Pins 10 & 12
Parallel port J14 Reset switch J22/Pins 18 & 20
Serial port 2 J15 32-bit PCI slots

PC1 - PC4


USER CONFIGURABLE SETTINGS

Function

Label

Position

»

 CMOS memory normal operation J4 Pins 2 & 3 closed
  CMOS memory clear J4 Pins 1 & 2 closed
  SDRAM voltage selection (3.3v/5v) JP1 Unidentified


SIMM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(2) 1M x 36

None

16MB

(2) 2M x 36

None

16MB

(2) 1M x 36

(2) 1M x 36

24MB

(2) 2M x 36

(2) 1M x 36

32MB

(2) 4M x 36

None

32MB

(2) 2M x 36

(2) 2M x 36

40MB

(2) 4M x 36

(2) 1M x 36

48MB

(2) 4M x 36

(2) 2M x 36

64MB

(2) 8M x 36

None

64MB

(2) 4M x 36

(2) 4M x 36

72MB

(2) 8M x 36

(2) 1M x 36

80MB

(2) 8M x 36

(2) 2M x 36

96MB

(2) 8M x 36

(2) 4M x 36

128MB

(2) 8M x 36

(2) 8M x 36

128MB

(2) 16M x 36

None

136MB

(2) 16M x 36

(2) 1M x 36

144MB

(2) 16M x 36

(2) 2M x 36

160MB

(2) 16M x 36

(2) 4M x 36

192MB

(2) 16M x 36

(2) 8M x 36

256MB

(2) 16M x 36

(2) 16M x 36

Note:  Board accepts EDO & SDRAM memory.
Note:  If using both SIMM and DIMM memory, only one bank of each may be filled simultaneously.


DIMM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(1) 1M x 64

None

16MB

(1) 1M x 64

(1) 1M x 64

16MB

(1) 2M x 64

None

24MB

(1) 2M x 64

(1) 1M x 64

32MB

(1) 2M x 64

(1) 2M x 64

32MB

(1) 4M x 64

None

40MB

(1) 4M x 64

(1) 1M x 64

48MB

(1) 4M x 64

(1) 2M x 64

64MB

(1) 4M x 64

(1) 4M x 64

64MB

(1) 8M x 64

None

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) 8M x 64

(1) 8M x 64

128MB

(1) 16M x 64

None

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 supports EDO & SDRAM memory.
Note:   If using both SIMM and DIMM memory, only one bank of each may be filled simultaneously.


CLOCK SPEED SELECTION

Speed

 J24
»

66MHz

 Pins 17-20 open
 

75MHz

 Pins 17 & 18 closed
 

83.3MHz

 Pins 19 & 20 closed


CPU TYPE SELECTION

Type

 J25
Pentium Pins 1 & 2 closed
Pentium MMX Pins 3 & 4 closed
AM K5 Pins 5 & 6 closed
AM K6 Pins 7 & 8 closed
CX 6X86MX Pins 9 & 10 closed
CX M2 Pins 11 & 12 closed
IDT C6 Pins 13 & 14 closed


CPU MULTIPLIER SELECTION

Multiplier

 J24

1.5x

 Pins 1 & 2 closed

2x

 Pins 3 & 4 closed

2.5x

 Pins 5 & 6 closed

3x

 Pins 7 & 8 closed
3.5x Pins 9 & 10 closed
4x Pins 11 & 12 closed
4.5x Pins 13 & 14 closed
5x Pins 15 & 16 closed


MISCELLANEOUS TECHNICAL NOTES

Processor speeds listed include the speeds available for the Cyrix 6X86MX CPU, which is synonymous with the Cyrix M2 CPU.