>hef4094
>        movwf txbyte
>        movlw 0x07
>        movwf bitcount
>Sendbit
>        btfss txbyte, bitcount  ; Skip next line if bit is set.
>        call SendZero           ; Sends a 0
>        call SendOne            ; Sends a 1
>        decfsz bitcount,1       ; Decrement bitcount, SKip if Zero
>        goto Sendbit
>       return

You will never transmit bit 0 using this routine, and it will always
transmit an extra 1 bit if you try to send a 0 bit. Also any new data
that you send will not appear at the outputs of the 4094 until the
next bit send is executed. ie CLOCK = high.

Try this.....

hef4094
      movwf txbyte
      movlw 0x08
      movwf bitcount
Sendbit
      rlf txbyte
      btfss status,carry
      goto send0
      call SendOne
      goto OneLess
Send0
      call SendZero
OneLess
      decfsz bitcount
      goto Sendbit
      return

Also try this for the SendOne/Zero routine.....

      ; Clock bit is normally HIGH, so that previous data is already
      ; at the output gates.

SendZero
      bcf Port(x),DATA    ; send 0 bit
      goto ClkOut

SendOne
      bsf Port(x),DATA    ; send 1 bit
ClkOut
      call wait
      bcf Port(x),CLOCK   ;  strobe data to latches
      call wait
      bsf Port(x),CLOCK    ; send data to output pins
      ; the next instruction depends on how many instructions
      ; are executed before this routine is called again
      ; (may not be needed if clock speed is low)
      call wait
      return


I know you have already tried it, but it's fairly easy to trap
errors like these by using MPSIM or MBLAB simulator and single step
through the code. Another thing that is sometimes hard, but very necessary,
is to make sure the code is compatable with any external devices, or
you may suffer many frustrated hours of fruitless debugging.
This means a close examination of the device data sheet.

Tony

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