[BSG] Bit 28 (big-endian) of every 645 and 6180 instruction is labeled "inhibit", and prevents interrupts, connect faults, and timer runouts after this instruction (or pair on the 6180) On the 645, the inhibit bit was only obeyed in master (privileged) mode On the 6180, user programs can indeed use it, although there is no facility in PL/I to turn it on or off, and multi-CPU systems somewhat reduce its efficacy A timer in the 6180 CPU limits the length of inhibit to so-many contiguous microseconds; if the timer runs out, the CPU takes a lockup fault
If something inhibits an event or process, it prevents it or slows it down. The high cost of borrowing is inhibiting investment by industry in new equipment
To inhibit someone from doing something means to prevent them from doing it, although they want to do it or should be able to do it. It could inhibit the poor from getting the medical care they need