You can use a discontinuous boost circuit with adc feedback in the loop. A single programmed word will drop the voltage slightly. But with the right cap size, it will stay in range. Then add a few more pulses and then program the next word. It's just software so you can hit a wide range of desired target programming voltages. Worked fine for me decades ago. I still have my logbook pages from back then (1990.) Cheap. Simple.
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