We have had trouble in the past with socketed U106. The reliability of the sram is fundamental to the performance of the unit, so it is important.
No idea if an H8000 boot rom will run in an Orville. Have never tried it. Contact firstname.lastname@example.org if you want to purchase one.
There is no available service manual for Orville.
We no longer service Orville – too old, and nobody here knows them.
We do know a number of external people who may service our older equipment: