Michael your 1985 Tappan
It sounds exactly like the model I had in a house I built in Houston and lived in for 10 months before being transferred here. I'm 99% sure your dishwasher is made by GE. You are correct regarding the Temp Boost on option. It extended the main wash by 10 miknutes to aid in heating water and that was for any of the 3 cycles. It also added about 5 minutes to the final rinse phase. Otherwise this was simply a stripped down GE (at the time, more like a Hotpoint in cycle sequence). The true PotScrubbers ha an automatically extended main wash with the heating element engaged. The only way you could attempt to mimic this was the temp boost on. The only difference between the Pots & Pans cycle and Normal was the number of water changes still crammed into the same basic 60 minute cycle. In fact, I didn't like the Pots & Pans Cycle for heavy soil siemply because that (stupidly) shortened the main wash by a few minutes to be replaced by an initial short 1st rinse. So, I never used it. Because the machine performed so outstanding compared to my 1980 D&M kenmore, I got the GSD1200 GE in 1987 after puttihng up with the crappy Hotpoint PotWasher that came with the new house I bought January 1986, actually built July 1984. Flatly, that Hostpoint was no comparison to even your Tappan. But I loved the Tappan because it was a reasonable facsimile of a true PotScrubber with normal wash cycle and the temp boost on.
FYI Michael, here's the cycle sequence
Pots/Pans: PreWash, Rinse, Rinse Main Wash, Rinse, Rinse Rinse.
Normal: PreWash, Rinse, Rinse, Main Wash, Rinse, Rinse.
Light PreWash, Rinse, Main Wash, Rinse, Rinse.
With heated dry, all cycles were 62 minutes long and temp Boost added a total of 15 minutes more. Heting was not thermostatically controlled.