> That makes sense since it is part of an ASCII routine. I always use 
> D'30'

Sometimes you want the value to be representative of what you're doing

For example

;================================================
;        Convert string characters to upper case
;================================================

lc2uc    lfsr    fsr0,string  ;source data
         clrf    length       ;record message length

cloop    movlw   "^"          ;test for end of string
         xorwf   indf0,w
         bz      eos          ;yes
         movfw   indf0        ;no, get char
         addlw   .255-"z"     ;test if upper case letter
         addlw   ("z"-"a")+1
         bnc     nextc        ;no change to character
         movlw   0xe0         ;lower case letter, subtract 0x20
         addwf   indf0        ;store
nextc    incf    fsr0l        ;increment indices
         incf    length
         bra     cloop

eos

> but wouldn't it be "0" rather than '0' for the ASCII value?

         movlw   '0'
         movlw   "0"

both compile to movlw 0x30

wbr
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