I/O芯片：在486以上檔次的主�，板上都有I/O控制電路。它負責提供串行、并行接口及軟盤�(qū)動器控制接口�
I/O芯片相關(guān)型號 芯片組代碼：
2A69K：Intel 440BX 芯片�
2A69J：Intel 440LX 芯片�
2A69H: Intel 440FX 芯片�
2A59C: Intel Triton FX 芯片�
2A59F: Intel Triton II HX 芯片�
2A59G: Intel Triton VX 芯片�
2A59H: Intel Triton VX 芯片�
2A59I: Intel Triton TX 芯片�
2A59A: Intel Natoma (Neptune) 芯片�
2A597: Intel Mercury 芯片�
2A59B: Intel Mercury 芯片�
2B59A: Intel Neptune EISA 芯片�
2A5C7: VIA VT82C570 芯片�
2A5G7: VLSI VL82C594 芯片�
2A5GB: VLSI Lynx VL82C541/VL82C543
2A5IA: SiS 501/02/03 芯片�
2A5IC: SiS 5501/02/03 芯片�
2A5ID: SiS 5511/12/13 芯片�
2A5IE: SiS 5101-5103 芯片�
2A5IF: SiS 5596 芯片�
2A5IH: SiS 5571 芯片�
2A5II: SiS 5598 芯片�
2A5IK: SiS 5591 芯片�
2A5KB: Ali 1449/61/51 芯片�
2A5KC: 目前未知
2A5KF: ALI 1521/23 芯片�
2A5KI: ALI IV+ M1531/M1543 芯片� (Super TX 芯片�)
2A5LA: VIA Apollo VP1 芯片� (VT82C580VP) ( VXPro 芯片�)
2A5LC: VIA Apollo VP2 芯片� (AMD640 芯片�) 2A5LD: VIA VPX 芯片� ( VXPro+ 芯片�) 2A5LE: VIA Apollo (M)VP3
2A5L7: VIA VT82C570 2A5L9: VIA VT82C570M
2A5R5: Forex 601A-613 芯片�
2A5UI: Opti 82C822/596/597 芯片�
2A5UL: Opti 82C822/571/572 芯片�
2A5UM: Opti 82C822/546/547 芯片�
2A5UN: OptiViper-M82C556/557/558|Viper 82C556/557/558芯片�
2A5X7: UMC 82C890 芯片�
2A5X8: UMC UM8886BF/UM8891BF/UM8892BF 芯片�
2A4H2: Contaq 82C596-9 芯片�
2A4IB: SiS 496/497 芯片�
2A4KC: Ali 1439/45/31 芯片�
2A4KD: Ali 1489 芯片�
2A4L4: VIA 486A/482/505 芯片�
2A4L6: VIA 496/406/505 芯片�
2A4UK: OPTI-802G-822 芯片�
2A4X5: UMC 8881/8886 芯片�
2C403: EFAR EC802G-B 芯片�
2C4I8: SiS 471B/E 芯片�
2C4I9: SIS 85C471B/E/G 芯片�
2C4K9: ALI 14296 芯片�
2C4J6: 目前未知
2C4L2: VIA 82C486A 芯片�
2C4L6: VIA VT496G 芯片�
2C4UK: OPTI - 802G
2C4X2: UMC UM82C491/82C493 芯片�
2C4X6: UMC UM498F/496F
2A431: Cyrix 5510 芯片� (MediaGx)
廠商代碼�
A0 ASUS（華碩）
A1 Abit(Silicon Star)(升技)
A2 Atrend (中凌)
A3 ASI (Aquarius Systems Inc.)
A7 Arima Twn AB AOpen (建基)
AD Amaquest
AM Mirage
B0 Biostar (映泰)
B3 BCM
C1 Clevo
C2 Chicony
C3 Chaintech (承啟)
C5 Chaplet
C9 Computrend
CF Flagpoint
D0 Dataexpert (�(lián)�)
D1 DTK (�(chuàng)�)
D2 Digital (DEC)
D3 Digicom
D4 DFI（鉆石）
E1 ECS (Elitegroup) (磐英)
E3 EFA
E4 ESPCo
E6 Elonex
EC ENPC
F0 FIC (FICA) (大眾)
F2 Free Tech
F3 Full Yes (福揚)
F5 Fugutech
F9 Fordlian
FD DataExpert or Atima or GCT (�(lián)�)
FH Amptron
FN Amptron
G0 Giga-byte（技嘉）
G3 Gemlight
G9 Global Circuit Technology
H0 Hsin-Tech
H2 HOLCO (Shuttle)
I3 IWill （艾威）
I4 Inventa
I5 Informtech
J1 Jetway (Jetboard, Acorp) (捷波)
J2 Jamicon
J3 J-Bond（捷波）
J4 Jetta J6 Joss
K0 Kapok
K1 Kamei
L1 Lucky Star
M0 Matra
M2 Mycomp (TMC) and Megastar (皇朝/麥肯)
M3 Mitac
M4 Micro-star（微星）
M8 Mustek
M9 MLE
N5 NEC O0 Ocean (Octek)（海洋）
P1 PC-Chips (明致)
P4 Asus（華碩）
P8 Azza
P9 Powertech
PA Epox (Pronix) (磐英)
PC Pine
Q0 Quanta (Twn)
Q1 QDI（聯(lián)想）
R0 Mtech (Rise)
R2 Rectron
S2 Soyo (梅捷)
S5 Shuttle (Holco)
S9 Spring Circle
SA Seanix
SC Sukjung (Auhua Electronics Co. Ltd.)
SE SMT (Sundance Multiprocessor Technology Ltd)
SH SYE (Shing Yunn Technology Co., Ltd.)
SM San-Li and Hope Vision SN Soltek (碩泰�)
T0 Twinhead（倫飛�
T1 Taemung or Fentech
T4 Taken
T5 Tyan
T6 Trigen
TB Totem
TG Tekram（建邦）
TJ Totem
TP Commate, Ozzo
U0 U-Board
U2 AIR (UHC)
U6 Unitron
V3 Vtech (PCPartner)
V5 Vision Top Technology
V6 Vobis
V7 YKM (distribution by Dayton Micron)
W0 Wintec (Edom)
Z1 Zida (Tomato boards
在pentium4主板的開機電路中，由I/O芯片�(nèi)部的門電路來控制電源的14�16�，所以以pentium4主板的開機電路控制部分一般在I/O芯片�(nèi)��
