Aaron, I haven't time to compare your routine with this one, but I
notice there's no mention of CMCON in yours

Also I would be very reluctant to try new code on a PIC that
may be damaged

> ;       GP1 - Not used.  (Seems to be blown on this particular chip.)


         movlw   b'00010111'
;                     1           GP4=AN3 analogue i/p
;                       1         /INT
;                        1        Vref on CIN- pin
;                         1       CIN+ comparator i/p
         movwf   trisio

         movlw   b'10000000'     ;pullups off
         movwf   option_reg

         movlw   b'01011000'
;                   101           16 Tosc, Tad=4us @ 4MHz IntRC
;                      1          AN3 as ADC channel
         movwf   ansel

         bank0

         clrf    gpio
         movlw   b'00000111'     ;GPIO 0,1,2 as digital
         movwf   cmcon

         movlw   b'11001100'
;                  1              right-justified
;                   1             Vref on GP1 input pin
;                      11         Select AN3
         movwf   adcon0

         bcf     intcon,intf
         bsf     intcon,inte

         sleep                   ;wait for /INT wake up

         bcf     intcon,inte
         bcf     intcon,intf

         bsf     opto25          ;power-up Vref (also Acks 18F452)
         bsf     adcon0,adon

         call    t_loop          ;2ms power-up delay

sample   bsf     adcon0,go_done  ;start sample

         btfsc   adcon0,go_done  ;finished
         goto    $-1

         bank1                   ;copy result to temp
         movfw   adresl
         clrf    eeadr
         bank0
         movwf   temp2
         movfw   adresh
         andlw   b'00000011'
         addlw   b'01010000'
         movwf   temp1

         call    ee_write        ;copy temp to EEPROM
         movfw   temp2
         call    ee_write

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