Keith Dowsett wrote:

> The code will probably look something like this...
>
> Update_ADC      movf    PORTB,W         ; Assumes no pins forced high/low
>                 iorlw   0xF0            ; Set B7..B4
>                 movwf   PORTB
>                 swapf   Adc_value,W     ; Get new value in high bits
>                 bsf     STATUS,RP0      ; Go to page 1
>                 movwf   TRISB
>                 bcf     STATUS,RP0      ; Back to page 0
>
> I've assumed that none of the port B pins are being forced high/low,
> otherwise you will have to mirror the port in RAM and write that value
> instead. I've also assumed that your ADC value is stored in the low nibble
> of a byte with zeroes in the high nibble.
>
> Hope this helps,
>
> Keith.
>
> ==========================================================
> Keith Dowsett         "Variables won't; constants aren't."
>
> E-mail: kdowsett@rpms.ac.uk
>    WWW: http://kd.rpms.ac.uk/index.html
It does help ...It helped me to decide to keep the diodes and use the
program space for aught else.I think the page swapping buisness was the
proverbial straw Thanks to all who replied to my post. Tony M.