need help with pin outs for ADM3202 chip please

[StephenR0]

I can't answer your question about pins 11, 12, 13, and 14 on the ADM3202 chip. I've just programmed it with the programming pins on the back of the calculator. The reason people are suggesting using a USB to serial cable is that the programming voltage and the voltage of these cables is 3.3 volts, not the +12 and -12 volts of a serial port. You either need a maxim level converter chip to let you use a serial port or you can use one of the cheap USB to serial adapters that exist. As far as the programming port is concerned, you only need to use three pads, TX, RX, and ground. The other pads are for clearing the previous programming before loading the new program. But that can be done with one paper clip to short two pads and another to push the reset button in the hole in the back of the calculator. Does this make more sense now?