Micronyx already exists
Micronyx used to produce plug in security boards for PC's. The idea was to have a 2 state computer where the board couldn't possibly be tampered with by software installed on the computer and users required physical tokens to log in.. Marryl Lynch were so impressed they bought the company. I wonder what happened to them (not Merryl Lynch - Micronyx)? Perhaps the TPM chip took over some of their territory. They also had a software based version called Triumph! which could be easily bypassed by using Norton Utilities to "repair" the boot sector.
Actually I see there is a software company running under the name of Micronyx nowadays.