64-Bit AMIBIOS Version 1 is a possible version of AMIBIOS for systems based on the Intel IA-64 architecture. As of July 2023, no information is available regarding this or any other first version of 64-Bit AMIBIOS online. However, it might possibly exist due to the confirmed existence of 64-Bit AMIBIOS 02.00.00.
Like 64-Bit AMIBIOS 02.00.00, this version likely also contained an EFI shell and was actually an EFI firmware despite the name. It might also be based on AMIBIOS 07.00.xx.