comprising computer 60 the major components as illustrated therein are a z80 microprocessor 101 an eprom 102 a read write memory 103 a decoder demultiplexor 104 a j k flip flop 105 a two mhz crystal oscillator 108 and a z80 pio parallel port 113 table i presents detailed data for above components as well as other components illustrated in fig8 through 12 table i______________________________________component dataref no description______________________________________ 25 ecg electrode 01 3330 ndm corp 26 ecg electrode 01 3330 ndm corp 27 10k u03c9 shoulder pot 29 10k u03c9 length pot 30 10k u03c9 to 15k u03c9 variable resistance pressure sensor 31 stimulation electrode medtronic 3795 40 10k u03c9 44 5k u03c9 45 5k u03c9 46 5k u03c9 61 dac 0832 d a converter national semiconductor 62 dac 0832 d a converter national semiconductor 63 dac 0832 d a converter national semiconductor 64 adc 0808 a d converter national semiconductor 101 z80 microprocessor zilog inc 102 2716 eprom zilog inc 103 6116 read write memory hitachi 104 sn74ls138 decoder demultiplexer texas instruments 105 sn74ls73 flip flop texas instruments 106 68 u03bcf107 10k u03c9108 2 mhz oscillator109 0 1 u03bcf110 0 1 u03bcf111 0 1 u03bcf112 0 1 u03bcf113 z80 pio parallel i o port zilog inc 114 119 10k u03c9120 127 150 u03c9305 312 2n3904313 316 2sc1308321 324 470 u03c9329 332 470 u03c9333 336 1k u03c9337 340 100 u03c9325 328 10k u03c9333 336 1k u03c9337 340 100 u03c9350 356 se ne 555 signetics 360 361 100k u03c9362 0 1 u03bcf363 0 001 u03bcf364 365 10 k u03c9366 001 u03bcf357 2n3904367 22k u03c9368 10k u03c9369 0 1 u03bcf370 001 u03bcf370a 10k u03bc371 10k u03c9372 10k u03c9373 0 1 u03bcf374 375 22k u03c9376 10k u03c9377 0 1 u03bcf378 380 10k u03c9381 0 1 u03bcf382 10k u03c9383 22k.