8500TAC

CPU	V.3 or earlier	Intel P54C/CT/CS/CQS, P55C
	V.4 or later	Above + Cyrix 6x86, AMD 5k86
Speed	V.3 or earlier	75/90/100/120/133/150/166/180 MHz CPU 25/30/33 MHz PCI bus
	V.4 or later	66~200 MHz CPU 25/27.5/30/33 MHz PCI bus
	All	I/O clock 8MHz for ISA bus
DRAM Memory	72-pin 4/8/16/32 Mb SIMM 8 ~ 128Mb on board Supports EDO & fast page
Cache Memory	SRAM 256 Kb/512 Kb, write back Supports asynchronous mix mode SRAM & synchronous pipeline burst SRAM
BUS Slots	4 16-bit ISA & 3 PCI bus
PCI Enhanced IDE on Board	Supports 4 IDE Hard Drives Supports Mode 4 for High Performance HDs Supports LBA Mode
ISA I/O on Board	One Multi-mode Parallel Port Standard & Bi-directional, Enhanced (EPP), Extended (ECP Two Serial Port, 16550 UART Supports 360 Kb, 720 Kb, 1.2 Mb, 1.44 Mb, 2.88 Mb Floppy Drives Optional IR Transmission Optional PS/2 Mouse
Dimension	22 Cm x 27.5 Cm
BIOS	AMI Legal To update BIOS: 1) Turn off system 2) Put a disk with new BIOS named to AMIBOOT.ROM in drive A 3) Turn on system while pressing <Ctrl> & <Home> key 4) Release <Ctrl> & <Home> key after 3 seconds 5) System will update BIOS & re-boot
Operating System	MS/DOS, OS/2, Windows 3.x, Windows 95, Windows NT, Novell, UNIX, SCO UNIX

2. JUMPER SETTING

JP4 CMOS Function Select

Open To maintain setup data (Default)

Closed To clear setup memory

JP5 Flash ROM Type Voltage Select

1-2 Closed Closed +5 V

2-3 Closed +12 V

All Open EPROM used

JP8 Secondary IDE IRQ Select

1-2 Closed IRQ 15

2-3 Closed IRQ Thru PCI

JP9 Primary IDE IRQ Select

Closed IRQ 14

JP10 Cache Size Select

All Open No cache or 256 Kb

1-2 Closed STD 512 Kb

2-3 Closed ASTER 512 Kb

JP22 Engineer Test Pin

2-3 Closed Default

JP27 CPU CLOCK VOLTAGE SELECT

1-2 Closed (Closed*) 3.4 V

2-3 Closed (Open*) 3.5 V

JP30* Engineer Test Pin

1-2 Closed Default

JP35,36 COM 2/4 Operation Select

1-2 Closed Use Serial Port

2-3 Closed Use Infrared (with SMC 665IR)

*V.4 or later

3. CPU JUMPER SETTING

CPU Type JP23* JP24* JP20* JP20 Remark

Intel P54C/CQS/T
Cyrix 6x86
AMD 5k86 1-2, 4-5
Closed 2-3, 4-5,
7-8, 9-10
Closed Open 1-2, 3-4
Closed 3.4 V

Intel P55C/CT 2-3, 5-6
Closed 1-2, 3-4,
6-7,8-9
Closed Closed Open 3.4/2.5 V

*V.4 or later

CPU Speed JP6 JP7 JP15 JP16 JP21

INTEL (*V.4 or later)

75 MHz OPEN OPEN OPEN OPEN 1-2

90 OPEN
(CLOSED*) CLOSED OPEN OPEN 2-3

100 CLOSED CLOSED
(OPEN*) OPEN OPEN 2-3

120 OPEN
(CLOSED*) CLOSED OPEN CLOSED 2-3

133 CLOSED CLOSED
(OPEN*) OPEN CLOSED 2-3

150 OPEN
(CLOSED*) CLOSED CLOSED CLOSED 2-3

166 CLOSED CLOSED
(OPEN*) CLOSED CLOSED 2-3

180 OPEN
(CLOSED*) CLOSED CLOSED OPEN 2-3

CYRIX

100 (P120) OPEN OPEN OPEN CLOSED 1-2

110 (P133) OPEN CLOSED OPEN CLOSED 1-2

120 (P150) CLOSED CLOSED OPEN CLOSED 2-3

133 (P166) CLOSED OPEN OPEN CLOSED 2-3

AMD

66 (P75) CLOSED OPEN OPEN CLOSED 2-3

75 (P75) OPEN OPEN OPEN OPEN 1-2

83 (P90) OPEN CLOSED OPEN OPEN 2-3

90 (P90) CLOSED CLOSED OPEN OPEN 2-3

100 (P100) CLOSED OPEN OPEN OPEN 2-3

4. CONNECTOR
J8

Pin No Assignment Pin No Assignment

1 Speaker 14 NC

2 NC 15 NC

3 Ground 16 NC

4 Vcc 17 Green Control

5 Power LED+ 18 Ground

6 NC 19 NC

7 Ground 20 HDD LED-

8 Key Lock 21 HDD LED+

9 Ground 22 NC

10 Turbo LED- 23 Turbo Control

11 Turbo LED+ 24 Ground

12 Reset Control 25 Vcc

13 Ground 26 Ground

Pin No JP19
Fan Connector J12, J12A
IR Connector J13
PS/2 Mouse

1 Ground IRRX MS_DATA

2 Ground Ground NC

3 +12 V IRTX Ground

4 +12 V NC Vcc

5 Ground Vcc MS_CLK

6 Ground N/A N/A

JP4	CMOS Function Select
	Open	To maintain setup data (Default)
	Closed	To clear setup memory
JP5	Flash ROM Type Voltage Select
	1-2 Closed	Closed +5 V
	2-3 Closed	+12 V
	All Open	EPROM used
JP8	Secondary IDE IRQ Select
	1-2 Closed	IRQ 15
	2-3 Closed	IRQ Thru PCI
JP9	Primary IDE IRQ Select
	Closed	IRQ 14
JP10	Cache Size Select
	All Open	No cache or 256 Kb
	1-2 Closed	STD 512 Kb
	2-3 Closed	ASTER 512 Kb
JP22	Engineer Test Pin
	2-3 Closed	Default
JP27	CPU CLOCK VOLTAGE SELECT
	1-2 Closed (Closed*)	3.4 V
	2-3 Closed (Open*)	3.5 V
JP30*	Engineer Test Pin
	1-2 Closed	Default
JP35,36	COM 2/4 Operation Select
	1-2 Closed	Use Serial Port
	2-3 Closed	Use Infrared (with SMC 665IR)

CPU Type	JP23*	JP24*	JP20*	JP20	Remark
Intel P54C/CQS/T Cyrix 6x86 AMD 5k86	1-2, 4-5 Closed	2-3, 4-5, 7-8, 9-10 Closed	Open	1-2, 3-4 Closed	3.4 V
Intel P55C/CT	2-3, 5-6 Closed	1-2, 3-4, 6-7,8-9 Closed	Closed	Open	3.4/2.5 V

CPU Speed	JP6	JP7	JP15	JP16	JP21
INTEL (*V.4 or later)
75 MHz	OPEN	OPEN	OPEN	OPEN	1-2
90	OPEN (CLOSED*)	CLOSED	OPEN	OPEN	2-3
100	CLOSED	CLOSED (OPEN*)	OPEN	OPEN	2-3
120	OPEN (CLOSED*)	CLOSED	OPEN	CLOSED	2-3
133	CLOSED	CLOSED (OPEN*)	OPEN	CLOSED	2-3
150	OPEN (CLOSED*)	CLOSED	CLOSED	CLOSED	2-3
166	CLOSED	CLOSED (OPEN*)	CLOSED	CLOSED	2-3
180	OPEN (CLOSED*)	CLOSED	CLOSED	OPEN	2-3
CYRIX
100 (P120)	OPEN	OPEN	OPEN	CLOSED	1-2
110 (P133)	OPEN	CLOSED	OPEN	CLOSED	1-2
120 (P150)	CLOSED	CLOSED	OPEN	CLOSED	2-3
133 (P166)	CLOSED	OPEN	OPEN	CLOSED	2-3
AMD
66 (P75)	CLOSED	OPEN	OPEN	CLOSED	2-3
75 (P75)	OPEN	OPEN	OPEN	OPEN	1-2
83 (P90)	OPEN	CLOSED	OPEN	OPEN	2-3
90 (P90)	CLOSED	CLOSED	OPEN	OPEN	2-3
100 (P100)	CLOSED	OPEN	OPEN	OPEN	2-3

Pin No	Assignment	Pin No	Assignment
1	Speaker	14	NC
2	NC	15	NC
3	Ground	16	NC
4	Vcc	17	Green Control
5	Power LED+	18	Ground
6	NC	19	NC
7	Ground	20	HDD LED-
8	Key Lock	21	HDD LED+
9	Ground	22	NC
10	Turbo LED-	23	Turbo Control
11	Turbo LED+	24	Ground
12	Reset Control	25	Vcc
13	Ground	26	Ground

Pin No	JP19 Fan Connector	J12, J12A IR Connector	J13 PS/2 Mouse
1	Ground	IRRX	MS_DATA
2	Ground	Ground	NC
3	+12 V	IRTX	Ground
4	+12 V	NC	Vcc
5	Ground	Vcc	MS_CLK
6	Ground	N/A	N/A