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AMIBIOS is a | AMIBIOS is a personal computer BIOS developed by [[American Megatrends|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 == | == Purchase from Access Methods == | ||
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== List of known versions == | == 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 | 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 they 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 | Versions from AMIBIOS 2.2x all the way to AMIBIOS 6 and AMIBIOS 07.00.10 can often be identified by the date in the POST string, which actually does not change depending on the BIOS compile date (unlike AMIBIOS 07.00.xx and AMIBIOS 8) and were fixed dates from AMI indicating the core version release date. Although these dates were occasionally modified by OEMs or motherboard manufacturers, especially during the pre-WinBIOS (AMIBIOS 4) era. | ||
'''Notice:''' | '''Notice:''' Version labelling for very early AMIBIOS versions (pre-AMIBIOS Plus) is not certain due to lack of photos, ROM files and documents. As more information is available, these will be corrected. | ||
{| class="wikitable" style="width:100;%" | {| class="wikitable" style="width:100;%" | ||
|+List of known AMIBIOS versions | |+List of known AMIBIOS versions | ||
! | !Version name | ||
! | !First release date | ||
! | !Known core dates | ||
!POST screen (if available) | |||
!POST screen | |||
!Notes | !Notes | ||
|- | |- | ||
|[[AMIBIOS Rev-X2-03|''"Rev-X2-03" (Actual core version unknown)'']] | |[[AMIBIOS Rev-X2-03|''"Rev-X2-03" (Actual core version unknown)'']] | ||
|1985 or 1986(?) | |1985 or 1986(?) | ||
|'' | |''Not available'' | ||
|[[File:AMIBIOS_Rev-X2-03_POST.png|300px]] | |[[File:AMIBIOS_Rev-X2-03_POST.png|300px]] | ||
|Possibly earliest known version. | |Possibly earliest known version. | ||
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|[[AMIBIOS 2.2x|AMIBIOS 2.2x(?)]] | |[[AMIBIOS 2.2x|AMIBIOS 2.2x(?)]] | ||
|1986 | |1986 | ||
|<code>061286</code> | |<code>061286</code><code>050687</code> | ||
<code>070387</code> | |||
<code>013189</code> | |||
<code>022389</code> | |||
<code>021390</code> | |||
<code>060190</code> | |||
|[[File:AMIBIOS_2.2x_POST.png|300px]] | |[[File:AMIBIOS_2.2x_POST.png|300px]] | ||
|Assumed to be AMIBIOS 2.2x, might not be correct. | |Assumed to be AMIBIOS 2.2x, might not be correct. | ||
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|[[AMI Plus BIOS]] | |[[AMI Plus BIOS]] | ||
|1987 | |1987 | ||
|<code>110387</code> | |<code>110387</code><code>010388</code><code>021988</code><code>082588</code><code>092588</code><code>021589</code><code>022589</code><code>030389</code><code>032089</code><code>033089</code><code>043089</code><code>061389</code><code>083089</code><code>091589</code><code>121589</code><code>022090</code><code>040990</code><code>051390</code><code>052390</code><code>061390</code><code>062590</code><code>063090</code><code>083090</code><code>101590</code><code>113090</code><code>121590</code> | ||
|[[File:AMI_Plus_BIOS_POST.png|300px]] | |[[File:AMI_Plus_BIOS_POST.png|300px]] | ||
| | | | ||
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|[[AMI Hi-Flex BIOS]] | |[[AMI Hi-Flex BIOS]] | ||
|1990 | |1990 | ||
|<code>111590</code> | |<code>111590</code> | ||
|[[File:AMI_Hi-Flex_BIOS_POST.png|300px]] | |[[File:AMI_Hi-Flex_BIOS_POST.png|300px]] | ||
|Programmer's guide to AMIBIOS book does not list releases with core dates before <code>031591</code> (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. | |Programmer's guide to AMIBIOS book does not list releases with core dates before <code>031591</code> (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. | ||
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|[[AMI WinBIOS|AMI WinBIOS (AMIBIOS 4)]] | |[[AMI WinBIOS|AMI WinBIOS (AMIBIOS 4)]] | ||
|1993 | |1993 | ||
|<code>121593</code> | |<code>121593</code> | ||
|[[File:WinBIOS_POST_screen.png|300px]] | |[[File:WinBIOS_POST_screen.png|300px]] | ||
|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). Subcore <code>082594</code> also exists, although it's assumed to be a re-badge of subcore <code>072594</code> modified by some OEMs due to lower core version compared to <code>081594</code>. | |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). Subcore <code>082594</code> also exists, although it's assumed to be a re-badge of subcore <code>072594</code> modified by some OEMs due to lower core version compared to <code>081594</code>. | ||
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|[[AMIBIOS 5]] | |[[AMIBIOS 5]] | ||
|1994 | |1994 | ||
|<code>101094</code> | |<code>101094</code> | ||
|[[File:AMIBIOS 5 101094.png|300px]] | |[[File:AMIBIOS 5 101094.png|300px]] | ||
| | | | ||
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|[[AMIBIOS 6]] | |[[AMIBIOS 6]] | ||
|1995 | |1995 | ||
|<code>071595</code> | |<code>071595</code> <code>071597</code> | ||
<code>071599</code><code>051100</code> | |||
|[[File:AMIBIOS 6 POST screen.png|300px]] | |[[File:AMIBIOS 6 POST screen.png|300px]] | ||
| | | | ||
|- | |- | ||
|[[AMI eBIOS Version 1]] | |[[AMI eBIOS Version 1]] | ||
|''Unknown'' | |''Unknown'' | ||
|''Unknown'' | |''Unknown'' | ||
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|[[AMIBIOS 07.00.xx]] | |[[AMIBIOS 07.00.xx]] | ||
|1999 | |1999 | ||
|'' | |''Not available'' | ||
|[[File:AMIBIOS 07.00.xx POST.png|300px]] | |[[File:AMIBIOS 07.00.xx POST.png|300px]] | ||
|Not to be confused with AMIBIOS 7 (07.00.10, subcore date 040201). Probably a public beta release for [[AMIBIOS 8]]. | |Not to be confused with AMIBIOS 7 (07.00.10, subcore date 040201). Probably a public beta release for [[AMIBIOS 8]]. | ||
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|[[AMI eBIOS 02.00.xx]] | |[[AMI eBIOS 02.00.xx]] | ||
|2000 or 1999 | |2000 or 1999 | ||
|'' | |''Not available'' | ||
|[[File:RCH31-18b.jpg|300px]] | |[[File:RCH31-18b.jpg|300px]] | ||
|Assumed to be a variant of [[AMIBIOS 07.00.xx]] for embedded systems. Not much is known about it. | |Assumed to be a variant of [[AMIBIOS 07.00.xx]] for embedded systems. Not much is known about it. | ||
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|[[AMIBIOS 07.00.10|AMIBIOS 7 (07.00.10)]] | |[[AMIBIOS 07.00.10|AMIBIOS 7 (07.00.10)]] | ||
|2001 | |2001 | ||
|<code>040201</code> | |<code>040201</code> | ||
|[[File:AMIBIOS 07.00.10 POST.png|300px]] | |[[File:AMIBIOS 07.00.10 POST.png|300px]] | ||
|Not to be confused with AMIBIOS 07.00.xx. Assumed to be an update for the AMIBIOS 071595 codebase. | |Not to be confused with AMIBIOS 07.00.xx. Assumed to be an update for the AMIBIOS 071595 codebase. | ||
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|[[64-Bit AMIBIOS Version 1]] | |[[64-Bit AMIBIOS Version 1]] | ||
|2001(?) | |2001(?) | ||
|''Unknown'' | |''Unknown'' | ||
|''Not available.'' | |''Not available.'' | ||
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|[[AMIBIOS 8]] | |[[AMIBIOS 8]] | ||
|2001 | |2001 | ||
|'' | |''Not available'' | ||
|[[File:AMIBIOS 8 POST screen (large logo).png|300px]] | |[[File:AMIBIOS 8 POST screen (large logo).png|300px]] | ||
[[File:AMIBIOS 8 with small AMI logo.png|300px]] | [[File:AMIBIOS 8 with small AMI logo.png|300px]] | ||
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|[[64-Bit AMIBIOS 02.00.00]] | |[[64-Bit AMIBIOS 02.00.00]] | ||
|2003(?) | |2003(?) | ||
|'' | |''Not available'' | ||
|''Not available.'' | |''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. | |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. | ||
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|[[AMIBIOS 9]] | |[[AMIBIOS 9]] | ||
|''Unknown'' | |''Unknown'' | ||
|'' | |''Not available'' | ||
|''Not available.'' | |''Not available.'' | ||
|Only some strings (found in a specific version of vmvp.exe for Hyper-V in Microsoft Windows 7 SP1) are available, assumed to be a special version or fork for Microsoft Hyper-V, or possibly the name given to emulated BIOS for CSM mode in AMI Aptio. | |Only some strings (found in a specific version of vmvp.exe for Hyper-V in Microsoft Windows 7 SP1) are available, assumed to be a special version or fork for Microsoft Hyper-V, or possibly the name given to emulated BIOS for CSM mode in AMI Aptio. | ||
Revision as of 17:59, 15 December 2023
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 they 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 the date in the POST string, which actually does not change depending on the BIOS compile date (unlike AMIBIOS 07.00.xx and AMIBIOS 8) and were fixed dates from AMI indicating the core version release date. Although these dates were occasionally modified by OEMs or motherboard manufacturers, especially during the pre-WinBIOS (AMIBIOS 4) era.
Notice: Version labelling for very early AMIBIOS versions (pre-AMIBIOS Plus) is not certain due to lack of photos, ROM files and documents. As more information is available, these will be corrected.
| Version name | First release date | Known core dates | POST screen (if available) | Notes |
|---|---|---|---|---|
| "Rev-X2-03" (Actual core version unknown) | 1985 or 1986(?) | Not available | 
|
Possibly earliest known version. |
| AMIBIOS 2.2x(?) | 1986 | 061286050687
|
|
Assumed to be AMIBIOS 2.2x, might not be correct. |
| AMI Plus BIOS | 1987 | 110387010388021988082588092588021589022589030389032089033089043089061389083089091589121589022090040990051390052390061390062590063090083090101590113090121590
|
|
|
| AMI Hi-Flex BIOS | 1990 | 111590
|
|
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
|
|
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). Subcore 082594 also exists, although it's assumed to be a re-badge of subcore 072594 modified by some OEMs due to lower core version compared to 081594.
|
| AMIBIOS 5 | 1994 | 101094
|
|
|
| AMIBIOS 6 | 1995 | 071595 071597
|
|
|
| AMI eBIOS Version 1 | Unknown | Unknown | Not available. | Currently no information is known, might not exist but assumed to be due to eBIOS 02.00.xx. |
| AMIBIOS 07.00.xx | 1999 | Not available | 
|
Not to be confused with AMIBIOS 7 (07.00.10, subcore date 040201). Probably a public beta release for AMIBIOS 8. |
| AMI eBIOS 02.00.xx | 2000 or 1999 | Not available | 
|
Assumed to be a variant of AMIBIOS 07.00.xx for embedded systems. Not much is known about it. |
| AMIBIOS 7 (07.00.10) | 2001 | 040201
|
|
Not to be confused with AMIBIOS 07.00.xx. Assumed to be an update for the AMIBIOS 071595 codebase. |
| 64-Bit AMIBIOS Version 1 | 2001(?) | Unknown | Not available. | Currently no information is known, might not exist but assumed to be due to 64-Bit AMIBIOS 02.00.00. |
| AMIBIOS 8 | 2001 | Not available | .png)
|
Last standalone version of AMIBIOS |
| 64-Bit AMIBIOS 02.00.00 | 2003(?) | Not available | 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 | Not available. | Only some strings (found in a specific version of vmvp.exe for Hyper-V in Microsoft Windows 7 SP1) are available, assumed to be a special version or fork for Microsoft Hyper-V, or possibly the name given to emulated BIOS for CSM mode in AMI Aptio. |
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
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").
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.