BIOS virus (not the eprom burners) real?

hello and greetings to all:
A simple question has any one ever proved the actual bios binaries in a actual PC was ever virus infected by the HDD.?
proof being.
all batteries and AC power removed, HDD removed.
and fully discharged all caps and off line VRMs.

then on re-power up, no HDD, there is virus found in the EEPROM.?
endless rumors, no proof yet.

1995 to 2014 years, of EEPROM and no TPM and no UEFI yet.
just want to know this, and this forum seems like a place to start.


thanks for any clues, or help or pointers to these facts.
good day and Happy Holidays.