AMIBIOS is a Personal Computer BIOS developed by AMI (American Megatrends), which bought off it's rights from Access Methods Inc. in around 1986. Earliest known release of AMIBIOS is from 1985. While AMIBIOS is still in use on some industrial legacy machines to this day, it is no longer in use for most personal computers since early-2010s due to UEFI's increasing popularity. AMIBIOS has been mostly replaced by Aptio, the EFI/UEFI firmware developed by AMI.
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 of Access Methods, called Quintessential Consultants Inc. (QCI). It then got renamed to American Megatrends Inc. (AMI) to keep the "AMIBIOS" acronym. American Megatrends then bought AMIBIOS from Access Methods in 1986.
List of known versions
All versions made before AMIBIOS Plus were first released by Access Methods, although some later cores of these versions (ones released after the purchase) had American Megatrends copyright as the updated cores were released by them.
Versions from AMIBIOS 2.2x all the way to AMIBIOS 6 and AMIBIOS 07.00.10 can often be identified by their subcore dates, which actually does not change depending on the BIOS compile date (unlike other AMIBIOS 07.00.xx releases and AMIBIOS 8) and were fixed dates from AMI indicating the subcore release date. The subcore date can be found in the BIOS string during POST (refer to the BIOS string section of this page for further information). Please note that the core dates were occasionally modified by OEMs or motherboard manufacturers, especially during the pre-WinBIOS (AMIBIOS 4) era. Full list of subcores are available on the main page for each of these BIOS versions.
Notice: Core version labelling for very early AMIBIOS versions (pre-AMIBIOS Plus) is unknown due to lack of photos, ROM files and documents. As more information is available, these will be corrected.
| Main core version | Main core release date | Earliest known subcore date | Last known subcore date | Notes |
|---|---|---|---|---|
| "Rev-X2-03" (Actual core version unknown) | 1985 or 1986(?) | No subcore dates used | No subcore dates used | Possibly earliest known version. |
| AMIBIOS 2.2x(?) | 1986 | 061286 (June 12, 1986) | 013189 (January 31, 1989) | Assumed to be AMIBIOS 2.2x, might not be correct. |
| AMI Plus BIOS | 1987 | 110387 (November 3, 1987) | 030891 (March 8, 1991) | |
| AMI Hi-Flex BIOS | 1990 | 111590 (November 15, 1990) | 011094 (January 10, 1994) | Programmer's guide to AMIBIOS book does not list releases with core dates before 031591 (March 15, 1991) as Hi-Flex, however earlier core dates do definitely exist. Not to be confused with the Hi-Flex Setup Utility on AMIBIOS 6 and 07.00.10 (although the setup utility was named after it). Hi-Flex might also be AMIBIOS 3. |
| AMI WinBIOS (AMIBIOS 4) | 1993 | 121593 (December 15, 1993) | 072594 (July 25, 1994) | Often referred to as AMI WinBIOS, not to be confused with the WinBIOS Setup Utility on AMIBIOS 5 and 6 (although that was named after it). |
| AMIBIOS 5 | 1994 | 101094 (October 10, 1994) | None (101094 only) | |
| AMIBIOS 6 | 1995 | 071595 (July 15, 1995) | 071599 (July 15, 1999) | |
| AMIBIOS 07.00.xx | 1999 | No subcore dates used | No subcore dates used | Not to be confused with AMIBIOS 7 (07.00.10, subcore date 040201) |
| AMIBIOS 7 (07.00.10) | 2001 | 040201 (April 2, 2001) | None (040201 only) | Not to be confused with AMIBIOS 07.00.xx |
| AMIBIOS 8 | 2001 | No subcore dates used | No subcore dates used | Last version of AMIBIOS |
BIOS string
The BIOS string for AMIBIOS was first introduced with AMIBIOS 2.2x for easy identification of each BIOS release and is often seen during POST at the very bottom of the screen. The string format was changed a couple times with new core versions of AMIBIOS. Known codes for some identification sections are given in the List of codes for BIOS strings section.
AMIBIOS 2.2x
MMMM: Manufacturer/OEM identification code, SSSSSS: BIOS subcore release date
MMMM-SSSSSS
Example string: 1406-061286
This string is for a 06/12/86 (June 12, 1986; date is in American format) dated subcore BIOS for Flying Triumph Co. Ltd. ("1406").
AMI Plus BIOS (Early)
D: CMOS setup type, CCC: Chipset type, MMMM: Manufacturer/OEM identification code, SSSSSS: BIOS subcore release date, KK: Keyboard controller (KBC) ID (with second character indicating the model).
DCCC-MMMM-SSSSSS-KK
Note: The CMOS setup type code can 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 a 04/30/89 (April 30, 1989; date is in American format) dated subcore AMI Plus BIOS with regular CMOS setup and built-in diagnostics ("D") for a machine with a discrete i286 logic ("286") and a default/unknown keyboard controller (K"0") made by Trangg Bow Co. ("1277").
AMI Plus BIOS (Late) and later BIOS versions
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, Project: BIOS project ID (no maximum characters), K: Keyboard controller (KBC) ID
CR-VVVV-00MMMM-FFFFFFFF-SSSSSS-DDDDDDDD-Project-K
Note: The project ID section is only present on late AMIBIOS 6 and later releases. The keyboard controller ID is also not used since AMIBIOS 07.00.xx.
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)