Das habe ich auf der Tyan Seite noch gefunden, vielleicht hilfts:
Recovery Method for Tyan Pentium II / III models with BX or GX chipsets, BIOS version 1.12 or higher ONLY:
Requirements: File to program (unzipped) on a clean floppy disk with no other files. Keyboard used must be PS/2 (you cannot use USB or wireless).
Procedure:
Download the file to program and rename the file to amiboot.rom
Copy the renamed file, "amiboot.rom", to a clean floppy diskette with no other files on the diskette. DO NOT MAKE IT BOOTABLE!
Next, power off system and place the diskette with the renamed file into the floppy disk drive.
While holding the "Ctrl" and "Home" keys down together, turn the system power on. NOTE: ther will be no display during this procedure.
Once the A: drive is initialized, let go of the keys. Afterwards, the floppy disk drive will program the new BIOS version. This process takes approximately 10-15 seconds.
The system will indicate programming completion of the BIOS with a beep or a series of beeps. Thereafter, it is safe to turn off the system.
Clear the CMOS.
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