i ran across this info again today in the motorola 68hc11a8 manual which covers our processors.
"A multiplexer allows the single A/D converter to select one of sixteen analog signals.
Eight of these channels correspond to port E input lines to the MCU, four of the channels
are for internal reference points or test functions, and four channels are reserved
for future use. Table 7-1 shows the signals selected by the four channel select control
bits."
Makes me wonder if we could run 4 additional circuits into the multiplexer pins and then just modify code to access those lines? the code to read the a2d multiplexer is straightforward. if possible this could really allow easy input of EGT,WB, and other analog devices. plus, it seems that several of the a2d lines are not used at all currently. maybe shelgame could shed some light on this......