The 8080 interrupt system is one of the most simple and straightforward. Instead of having sophisticated built-in mechanics, reacting to interrupts, the 8080 just accepts a single instruction from an external source, marking this cycle with INTA. This opens up many more possibilities for external interaction than fixed handling.
RSTx instructions ...
AFAIK Mostek M/OS-80 was a licensed derivative of an Infosoft CP/M-compatible operating system. There is an M/OS-80 manual on bitsavers in this directory: