AMIBIOS is a personal computer BIOS developed by AMI (American Megatrends), which has bought it's rights from Access Methods Inc. in around 1986. Earliest known mentions of AMIBIOS are from 1985, with the earliest known version likely being released around that time.
While it is still used on some current day industrial/embedded platforms (such as ones based on the Vortex86 SoC), it has been fully phased out on modern consumer platforms in favor of (U)EFI-based solutions such as Aptio (which is it's successor), InsydeH2O and Phoenix SecureCore. However, most older instances of Aptio released still included an embedded version of AMIBIOS 8 as a component module for CSM/legacy boot. With CSM being discontinued by Intel in 2020 however, the module is no longer present.[1]
Purchase from Access Methods
Main page: American Megatrends
Access Methods Inc. created AMIBIOS in 1985. Same year, Access Methods' owners (Subramonian Shankar and Pat Sarma) found a new company from the funds raised with it. It was called Quintessential Consultants Inc. (QCI), which then got renamed to American Megatrends Inc. (AMI) to keep the "AMIBIOS" acronym. American Megatrends then bought AMIBIOS from Access Methods next year.
List of known versions
All versions made before AMI Plus BIOS were released by Access Methods, although some of these versions later received new cores (revisions) from American Megatrends and those had their copyright (instead of Access Methods').
Almost all instances of versions from AMIBIOS 2.2x to AMIBIOS 6 and AMIBIOS 07.00.10 can be identified by the date in the POST string, which (unlike on AMIBIOS 07.00.xx and 8) is actually fixed to the initial AMIBIOS release date. However these dates were occasionally modified by OEMs/motherboard manufacturers to reflect the BIOS compile or revision release date instead, especially during the pre-WinBIOS (AMIBIOS 4) era. Since AMIBIOS 07.00.xx (excluding AMIBIOS 07.00.10), the date in the string reflects the specific revision's compile date instead and therefore cannot be used to determine the initial release date of the AMIBIOS version.
Notice: Due to lack of proper information and reference guides, names for all versions made before AMI Hi-Flex BIOS are assumed based on a few unofficial sources online and they may not reflect the actual BIOS version names. As more information is discovered, these may be corrected.
| Version name | First release date | POST screen (if available) | Notes |
|---|---|---|---|
| "Rev-X2-03" (AMIBIOS 2.03?) | Most likely 1985 or early 1986 | 
|
Possibly the earliest known version. AMIBIOS 2.03 is a possible name, although unconfirmed. |
| AMIBIOS 2.2x(?) | 1986 | 
|
The name is assumed based on unofficial information and may not be correct. |
| AMI Plus BIOS(?) | 1987 | 
|
The name is assumed based on unofficial information and may not be correct. Sometimes (unofficially) also called AMI Pre-Color BIOS by some enthusiasts as it has a black and white setup utility and was released before Hi-Flex BIOS (which is often also unofficially called AMI Color BIOS, due to it's colorful setup utility). |
| AMI Hi-Flex BIOS | 1990 | 
|
Not to be confused with the Hi-Flex Setup Utility on AMIBIOS 6 and 07.00.10, which was named after it. Unofficially also called AMI Color BIOS by some enthusiasts (due to its colorful setup utility). It was likely also called AMIBIOS 3 internally, although unconfirmed. |
| AMI WinBIOS (AMIBIOS 4) | 1993 | 
|
Often referred to as AMI WinBIOS, not to be confused with the WinBIOS Setup Utility on AMIBIOS 6 (which was named after it). Often known with the core date 121593 (December 15, 1993) in string, however other core dates also exist.
|
| AMIBIOS 5 | 1994 | 
|
Visually looks almost identical to AMIBIOS 4, although contains initial bug fixes and new features. Often known with the core date 101094 (October 10, 1994) in string.
|
| AMIBIOS 6 | 1995 | 
|
Often known with the core date 071595 in string, however other core dates also exist.
|
| AMI eBIOS Version 1 | Unknown | Not available. | Currently no information is available and it might not actually exist, however it is assumed to exist due to the existence of eBIOS 02.00.xx. |
| AMIBIOS 07.00.xx / 07.00.00 | 1999 | 
|
Not to be confused with AMIBIOS 07.00.10 [with date 040201 (April 2, 2001) in string]. Probably an early development release of AMIBIOS 8, which might have initially been called AMIBIOS 7.
|
| AMI eBIOS 02.00.xx | 2000 or 1999 | 
|
Assumed to be a variant of AMIBIOS 07.00.xx for embedded systems. Not much else is known about it. |
| AMIBIOS 7 (07.00.10) | 2001 | 
|
Not to be confused with AMIBIOS 07.00.xx/07.00.00. Often known with the core date 040201 (April 2, 2001) in string. Assumed to be an update based on the AMIBIOS 6 codebase.
|
| 64-Bit AMIBIOS Version 1 | 2001(?) | Not available. | Currently no information is available and it might not actually exist, however it is assumed to exist due to the existence of 64-Bit AMIBIOS 02.00.00. |
| AMIBIOS 8 | 2001 | .png)
|
Last standalone version of AMIBIOS. Most likely the final product for AMIBIOS 07.00.xx/07.00.00. Although first released in 2001, it was not used widely until a couple years later. |
| 64-Bit AMIBIOS 02.00.00 | 2003(?) | Not available. | Assumed to be a variant of AMIBIOS 8 or 07.00.xx for Itanium based servers. Only known instance is on the SuperMicro MBD-i2DML-8G2-O Intel Itanium motherboard. |
| AMIBIOS 9 | Unknown | Not available. | Used on Microsoft Hyper-V. Assumed to be a special version or code fork for it, or possibly the name given to emulated BIOS for CSM mode in AMI Aptio. |
BIOS string
The BIOS string was first introduced with AMIBIOS 2.2x for easy identification of each BIOS revision (by the OEM/manufacturer) and is often seen during POST near the very bottom of the screen. The string is formatted to contain various sections, with each containing information for a different field. Known codes for these sections are given in the List of codes for BIOS strings (also available at the bottom of this page section). The formats have been changed various times with some new releases of AMIBIOS.
AMIBIOS 2.2x
MMMM: Manufacturer/OEM identification code, SSSSSS: BIOS version release date
MMMM-SSSSSS
Example string: 1406-061286
This string is for an AMIBIOS 2.2x version (released on June 12, 1986, "061286") for Flying Triumph Co. Ltd. ("1406").
AMI Plus BIOS
D: CMOS setup type, CCC: Chipset type, MMMM: Manufacturer/OEM identification code, SSSSSS: BIOS version release date, KK: Keyboard controller (KBC) ID (with second character indicating the model).
DCCC-MMMM-SSSSSS-KK
Note: The CMOS setup type code can also be two characters for "DE" in case the BIOS contains both extended setup and built-in diagnostics.
Example string: D286-1277-043089-K0
This string is for an AMI Plus BIOS version (released on April 30, 1986, "043089") with built-in diagnostics ("D") for a machine with a discrete 286 logic ("286") and a default/unknown keyboard controller (K"0") for Trangg Bow Co. ("1277").
AMI Hi-Flex BIOS, AMIBIOS 4, AMIBIOS 5 and early versions of AMIBIOS 6
C: Processor architecture, R: ROM size, MMMM: Manufacturer/OEM identification code, FFFFFFFF: BIOS feature identification (often 00101111), SSSSSS: BIOS compile date OR subcore release date, DDDDDDDD: BIOS identifier, K: Keyboard controller (KBC) ID
CR-VVVV-00MMMM-FFFFFFFF-SSSSSS-DDDDDDDD-K
Example string: 61-1108-001169-00101111-071595-440BX/ZX-1440B000-H
This string is for a 11.08 revision ("1108") 128 KB ("1") size AMIBIOS 6 ("071595", main subcore for it) for a motherboard for 686 architecture processors ("6") with Intel 440BX or 440ZX chipset ("440BX/ZX") and an AMIKEY-2 clone keyboard controller ("H") made by MSI ("1169").
List of known codes for BIOS strings
Click "Expand" to view.
AMI Plus BIOS CMOS setup type codes: D CMOS Setup & Built-in Diagnostics E Extended CMOS Setup S Regular CMOS Setup DE Extended CMOS Setup & Built-in Diagnostics AMI Plus BIOS Chipset codes: C&T Chips & Technologies C&T 386 chipset NET Chips & Technologies NEAT chipset 286 VLSI or G2 286 chipset, or discrete 286 logic SUN SUNTAC chipset PAQ COMPAQ Portable or ZyMOS POACH chipset AMI AMI 386 motherboards G23 G23 chipset AMIBIOS ROM size codes 0 64KB 1 128KB/1MB/2MB 2 256KB 3 512KB 4 1MB 5 2MB 6 4MB 7 8MB 8 16MB 9 32MB AMIBIOS CPU architecture codes 2 286 3 386 4 486 5 586 6 686 AMIBIOS manufacturer codes: 0394 Sukjung 1101 Sunlogix Inc 1102 Soyo 1103 Tidalpower Technology Inc 1105 Autocomputer Co 1106 Dynasty Computer Inc 1107 Dataexpert 1108 Chaplet 1109 Fair Friend Ent. Co 1111 Paoku P&C Co 1112 Aquarius Systems Inc 1113 Micro Leader Enterprises 1114 Iwill 1115 Senor Science Co 1116 Chicony 1117 Atrend 1120 Unicorn 1121 FIC (FICA) 1122 Microstar (MSI) 1123 Magtron Technology Co 1124 Tekram 1126 Chuntex Elex 1128 Chaintech 1130 Pai Jung Electronic Ind 1131 ECS (Elitegroup) 1131 PC Chips (Hsin Tech) 1132 Dkine Enterprise Co 1133 Seritech 1135 Acer 1136 Sun's Electronics Co 1138 Win-Win Elecronic Co 1140 Angine Limited Taiwan Branch (H. K.) 1141 Nuseed Technology Inc 1142 Firich Enterprises Co 1143 Crete Systems Inc 1144 Vista Technology Co 1146 Taste Corporation 1147 Integrated Technology Express 1150 Achitec 1151 Accos Enterprise Co 1152 Top-Thunder Technology Co 1154 San Li 1156 Technica House 1158 Hi-Com Industrial Co 1159 Twinhead 1161 Monterey International Corp 1163 Softek Systems Co 1165 Mercury Computer Corporation 1168 RioWorks Solutions 1169 Microstar (MSI) 1169 NEC 1170 Taiwan Igel Co 1171 Shing Yunn Electronics Enterprise Corp 1172 Giantec 1175 Applied Component Technology Corp 1176 Sigma Computer Corp 1177 High Tech Computer Corp 1178 Clevo 1180 Padalin International Development Corp 1181 Leo Systems Inc 1182 Alpha-Top Corporation 1183 Mirle Automation Corporation 1184 Delta Electronics 1188 Quanta Computer 1190 Chips and Technologies 1192 ICP 1193 Ser Comm Corp 1195 Gns Technoloies Inc 1196 Universal Scientific Industrial 1197 Golden Way Electronic Corp 1199 Gigabyte 1201 New Tech 1203 Sunrex Technology Corp 1204 Bestekcomputer Co 1206 Olivetti 1209 Puretek Industrial Co 1210 Rise Computer 1211 DFI 1214 Rever Computer Inc 1218 ECS (Elitegroup) 1221 Darter 1222 Domex (DTC) 1223 Biostar 1225 Yunglin Technology Corp 1229 Dataworld International Corp 1234 Leadman Electronic Co 1235 Formosa Industrial Computing 1238 Win Tech Technology Co 1241 Mustek 1242 Amptek Technology Co 1244 Flytech Group International 1246 Cosmotech Computer Corp 1247 Abit 1248 Muse Technology Co 1251 Portwell Infotech 1252 Sono Computer 1256 Lucky Star 1258 Four Star Computer Co 1259 GVC 1260 Dt Research Inc 1262 Arima 1266 Modula Tech Co 1270 Portwell Inc 1271 Tidal Technolongies Inc 1272 Ultima Electronics Corp 1273 Ufo Computer Co 1274 Full Yes 1275 Jackson Dai Industrial Co 1276 Jetway 1277 Trangg Bow 1281 EFA 1283 Advance Creative Computer Corp 1284 Lung Hwa Electronics Co 1286 Askey 1291 TMC (Taiwan MyComp Corporation) 1292 Asus 1297 DD&TT Enterprise Inc 1299 Trigem 1301 Taken 1304 Dual Enterprises Corporation 1309 Protronic Enterprises Corp 1317 New Comm Technology Co 1318 Unitron 1323 Inventec 1343 Shuttle (Holco) 1346 Snobol Industrial Corp 1347 PC Chips (Hsin Tech) 1351 Singdak Electronic Co 1353 J-Bond 1354 Protech Systems 1355 Arrgo Systems Inc 1367 Coxswain Technology Co 1371 ADI 1373 Silicon Integrated Systems Corp 1379 WinTechnologies (Edom) 1391 Aten International Co 1392 Acc Taiwan Inc 1393 Plato Technology Co 1396 Tatung 1398 Spring Circle 1400 Key Win Electronics 1403 Uniwill 1404 Alptech Logic Products Inc 1421 Well Join Industry 1422 Labway Computer Co 1425 Lindata Corp 1437 PC Chips (Hsin Tech) 1440 Great Electronics Corporation 1450 Win Lan 1451 Ecel Systems Corp 1452 United Hitech Corporation 1453 Kaimei 1461 Hedonic Computer Co 1462 Arche Technologies Inc 1470 Free Tech 1470 Flexus Computer Technology 1472 Datacom Technology Co 1484 Mitac 1490 Great Tek Corp 1491 President Technology Inc 1493 Artdex Computer Corp 1494 Pro Team Computer Corp 1500 Netcon Co 1503 Up Right Tech Co 1514 Wuu Lin Electronics Co 1519 EPoX 1526 Eagle Computer Technology Co 1531 Force System Inc 1540 BCM 1546 Golden Horse Computer Co 1549 Ct Continental Corp 1564 Random Technology Inc 1576 Jetta 1585 Gleem Industries Co 1588 Boser 1593 Advantech 1594 Mitac 1608 CMC 1612 Datavan International 1617 Honotron Corporation 1618 Union Genius Computer Co 1621 New Paradise Enterprise Co 1622 R.P.T. Intergroups International 1628 Digital Equipment International 1630 Iston Computer Corp 1647 Lantic Inc 1652 Ase Technologise Inc 1655 Kingston Technology Inc 1656 Storage System Inc 1658 Macrotek 1666 Cast Technology Inc 1671 Cordial Far East Corp 1672 Lapro Corporation 1675 Advanced Scientific Corp 1685 High Ability Computer Co 1691 Gain Technology Co 1697 Olivetti 1700 Dsg Technology Inc 1707 Chaining Computer & Communiction Co 1708 E-San Electronic Co 1719 Taiwan Turbo Technology Co 1720 Fantas Technology Co 1723 Ntk Computer Inc 1737 Ay Ruey International Co 1739 Jetpro Infotech Co 1743 Mitac 1759 BEK-Tronic Technology 1762 Ansoon Technology Co 1770 AOpen 1771 Toyen Computer Co 1774 Acer Sertek Inc 1776 Joss Technology 1780 Acrosser 1783 Efar Microsystems, Inc Taiwan Bran 1788 Systex Corporation 1792 U-Board 1794 Cmt-Taiwan, Inc 1796 J&J Technology 1800 Syzygia Computer Corporation 1801 Palit Microsystems Inc 1806 Interplanetary Information Co 1807 Expert Electronic Corp 1810 Elechands International Co 1815 Powertech 1820 Ovis Enterprises Co 1823 Inlog Microsystem 1826 Tercomputer Technologies Corp 1827 Anpro Inc 1828 AXIOM 1840 New Union H.K. New Union H.K. 1845 Pc Direct Technology Co 1846 Garnet International Corp 1847 Brain Power Co 1850 Htr Asia Pacific Inc 1853 Veridata Electronics Inc 1856 Smart D&M Technology 1867 Lth Rong Electronic Enterprise Co 1868 Soyo 1879 Aeontech International Co 188 Quanta Computer 1881 Manufacturing Technology Resources 1888 Seal International Corp 1889 Rock Technology Lo 1906 Freedom Data Technology Co 1914 Aquarius Systems Inc 1917 Source Of Computer Co 1918 Lanner Electronics 1920 Ipex Itg International 1924 Join Incorporation 1926 Kou Sheng Computer Co 1927 Seahill Technology Co 1928 Nexcom International Co 1929 Cam Enterprise Inc 1931 Aaeon 1932 Kuei Hao Industrial Co 1933 Asmt Corp 1934 Silver Bally Inc 1935 Prodisti Co 1936 Codegen Technology Co 1937 Orientech Electronics Corp, 1938 Project Information Company, 1939 Arbor Technology Corp 1940 Suntop Computer Systems Corp 1941 Funtech Entertainment Corp 1942 Sunflower Systems Inc 1943 Needs System Development Co 1945 Norm Advanced Technology Corporation 1947 Ten Yun Co 1948 Beneon Co 1949 National Advantages Computer Inc 1950 Mits Technology Co, 1951 Macromate Corp 1953 Orlycon Enterprise Co 1954 Chung Yu Electronics Co 1955 Yamashita 1957 High Large Corporation. 1958 Young Micro Systems 1959 Fastfame Technology Co., Ltd. 1960 Acqutek Corporation 1961 Deson Trade Inc 1962 Astra Communication Corp 1963 Dimensions Electronics Co 1964 Micron Design Technology Limited 1965 Cantta Enterprises Co 1968 Khi Way Enterprise Co 1969 Gemlight 1970 Mat Technologies Limited Norm Advanced Technology Corp 1973 Fugutech 1974 Green Taiwan Computer Co 1975 Supertone Electronic Co 1977 AT&T Taiwan Telecommunications Co 1978 Winco 1980 Teryang Systems Co 1981 Nexcom International Co 1982 China Semiconductor Corporation 1985 Top Union Electronics Corp 1986 Dmp Electronics Co 1988 Concierge Co, Ctd. 1989 Atherton Technology Co 1990 Expen Tech 1994 Japan Cere'Bro Computers Inc 1996 Ikon Technologies Corporation 1998 Sono Computer 3642 AMI 4500 PcPartner 4668 AMI 4707 AMI 4724 AMI 5701 AMI 5706 AMI 5711 AMI 5721 AMI 5722 AMI 5727 AMI 6063 IBM 6064 AIR 6100 Unika 6105 Dolch computer systems 6132 Technology Power Enterprises 6154 Sprite Inc. 6156 Genoa 6247 TTC Computer Products Irving 6259 VEGA 6259 Young Micro 6285 Tyan 6326 Crystal 6328 Alaris 6333 Addtech 6362 Northgate Computer Systems Inc 6362 Seanix 6385 HP 6386 Pacific Information, Inc 6389 Supermicro 6395 Lion Computer 6423 APC 6666 CTL Corp 6730 AMI 6735 AMI 6745 AMI 6750 AMI 6759 AMI 6770 AMI 6774 AMI 6781 AMI 6782 AMI 7803 AMI 8003 QDI 8021 Acer 8028 Wellstar 8031 Zida 8036 DTK 8045 VTech 8045 PcPartner 8045 Aristo 8054 Pine Technology 8060 GB486 Computer systems 8200 Gateway 891E Veridata Electronics Inc 9999 Generic code AMIBIOS keyboard controller (KBC) codes: 0 Almost always means command A1 (return KBC revision) has not returned a byte 5 AMI Megakey KB-5 (1995) (Copyright string returned by command A0 is 1994), most often seen on NSC and SM(S)C Super I/O chips 7 Unknown AMI clone 8 AMI '8' 9 Everex AMI A V-Tech chipset on-chip AMI clone B AMI 'B' D AMI 'D' E AMI 'E', also seen on some ALi M1489 boards when the output of the Read Command Byte Command gets mixed up for A1 output F AMIKEY (original) or its clone H AMIKEY-2 or its clone, AMIKEY-2 is seen on ITE and Winbond Super I/O chips M MR (Microid Research) AMI clone from 1991 P AMI Megakey (1993) R AMI Megakey (1994) (Copyright string returned by command A0 is 1993) X Most likely AMIKEY-3 for the 388xx, seen on a NEC LaVie C laptop U SARC 6042, also seen on some ALi M1489 boards when the output of the Read Command Byte Command gets mixed up for A1 output Z TriGem AMI, two variants exist - normal (based on 'F') and green (based on some revision of Megakey)
- ↑ https://www.intel.com/content/www/us/en/content-details/630266/removal-of-legacy-boot-support-for-intel-platforms-technical-advisory.html | Note: Although this document was published in 2023, it clearly mentions legacy boot being discontinued in 2020.