looking for missing rom

at28c16 crc ff7b63e3 for 1on1gov

What emulator are you using? Because that's an old bad dump and removed from Mame in May 2010.

https://bda.retroroms.info:82/downloads/mame/rollBack/MAME%20%28v0.138u1%29%20-%201on1gov.zip

wii system that uses mame v0.134u4 rom set

I see. You can find old removed roms in the Rollback folder of the BDA.