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> The 1750's built-in watchdog timer hardware was not used, over the objections of the lead software designer

I wish they delved into this a little deeper; was it because the WDT disables with one op? That does seem quite risky on its own

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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.

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