Unless this was not a Honeywell 1750 but a variant from another vendor (pretty common), the 1750 had only 2 hardware timers with just dedicated interrupts and n

Unless this was not a Honeywell 1750 but a variant from another vendor (pretty common), the 1750 had only 2 hardware timers with just dedicated interrupts and no true watchdog functionality like a kicking key or handshake. The CPU has a "trigger-go" counter that cannot be disabled that was meant as a monitor for software resets, but not a real watchdog implementation.