Originally I was using my SYM-1 (that's a 6502 single board computer with 32K of RAM, running @ 1Mhz) to process the data, using 3 ADC0804's.
SYM-1 6502. You've got the upgraded version.. I think the model I used was 4k, the interface a hex keypad and the display (if I remember) six 8-segement LED's. Some of the first programming I ever did was on one, in assembler, circa 1980. We talking about the same monster, screw mounted on a sheet of laminate plywood (with too rough edges?)