IBM 4300 Manual page 93

of interruptions are possible. As long as more
interruptions must be serviced, the string of
interruptions cannot be broken by employing the
stop function; program reset is required.
Interruptions for all requests for which the CPU
is enabled are taken before the CPU is placed in
the stopped state. When the CPU is in the stopped
state, restart has the highest priority.
Programming Note
The order in which concurrent interruption requests
are honored can be changed to some extent by
masking.
6-20 IBM 4300 Processors Principles of Operation