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> I never tried to directly record on the ISD chips. I created
> a BUNCH of audio files, then used a Quadravox programmer

I may get a programmer, but for now I've kind of automated the
process. The 25 messages are assembled on the right channel of
Goldwave. Separating them on the left channel are tone bursts.
These are fed into a 567 tone decoder and its output tells the PIC
what data and when to send it to the ISD

(The audio in the picture is actually Dick Clark saying "Two". I
found a New Year countdown mp3 of him and Ed McMahon
which was very useful for testing whether all the messages had
stuck and if they could be recalled correctly)

If the PIC powers up with button1 down, it enters Record mode.
kb_567 looks for a manual button in this mode

;Pushbuttons in Record mode
;Diode-steered into high nybble of PortD

;Play at 00                 button1
;Play at current address    button2
;Record at 00               button3
;Record at current address  button4
;Stop                       button5
;Cue to next message        button6
;Exit                       button7
;spare                      button8

kb_567   movfw   portd
         swapf   wreg
         andlw   b'00001111'
         skpz                  ;no button pressed
         bra     rec_234       ;button down, decode and release

lp567    btfss   ne567         ;rising edge
         bra     kb_567        ;no tone

         prtstr2 stopped       ;print "Stopped"

         clr_ss
         movlw   b'01110000'   ;stop command
         movwf   data_out
         call    data8
         set_ss
         call    ms100

         btfsc   ne567         ;falling edge
         bra     $-2
         
         btfsc   first         ;first message, record at 00
         bra     recatxx       ;not first
         bsf     first

recat00  prtstr2 record00      ;print "Record at 00"

         clr_ss
         clrf    data16_1      ;address = 0
         clrf    data16_2
         call    data16
         usec10
         movlw   b'10100000'   ;record from set address
         movwf   data_out
         call    data8
         set_ss
         bra     lp567

recatxx  prtstr2 recordxx      ;print "Record at xx"

         clr_ss
         movlw   b'10110000'   ;record from current address
         movwf   data_out
         call    data8
         set_ss
         bra     lp567


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