> The main thing is "Why undocumented?", not threat model and physical or remote exploit.
No, the main thing is if VISA is for qualifying chips on the production line, why don’t they burn a fuse permanently disabling it on chips that pass QA?
No, the main thing is if VISA is for qualifying chips on the production line, why don’t they burn a fuse permanently disabling it on chips that pass QA?
This said, its basically a giant signal mux system run into a main block, you'd be pretty limited on what preselected signals are available at a time. People were also reasonably careful not to give entire busses of signals at once.