Brian,
IF the original nibble is <= 9 then OR it with 30H to
get ASCII "0" - "9" exactly as James Cameron showed you.

IF the nibble has a hex value from 0AH to 0FH then
subtract 9 and OR with 40H.

For example, if the nibble
is 0AH then subtracting 9 will give you 01H, and ORing
with 40H will give you 41H. If you desire lower case
instead of upper case, then OR with 60H instead.

BTW, you can "subtract" 9 by adding the two's complement
of 9, which is F7H

Hope this helps.
Fr. Tom McGahee

----------
> From: Clewer,Brian <Brian.Clewer@TELEMATICS.COM>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: How to convert an 8 bit byte into two ASCII chars.
> Date: Thursday, June 11, 1998 2:50 PM
>
> James Cameron  wrote:
>
> >Clewer,Brian wrote:
> >> My problem is that I have an 8 bit byte and I need to convert it
> >> into two printable chars to send to my PC.  E.g..  00111001 would be
> >> 39 (in hex).  I need to send the two chars 3 and 9 to my PC.
> >
> >        move the byte to W
> >        swap nibbles (swapf)
> >        and with 0x0f
> >        or with 0x30
> >        send that byte
> >
> >        move the byte to W again
> >        and with 0x0f
> >        or with 0x30
> >        send that byte
> >
> >Hey, I enjoyed that.  Uh oh.  ;-)
>
> This is ok if you use the numbers 0 to 9 but it doesn't work if you need
> HEX values from A to F.
>
> Any more ideas?
>
> Thanks,
> Brian.