:: I think the word "constant" may be a clue here.....

I thought that as well, but this doesn't work either, that is not a 
declared constant.

 *fnt = 0x7E;

Although this is going into a 24F series, I have to use the const as 
I'm trialling the program in a 16F877A.

This doesn't explain why uC 'C' works with this code but FED_C 
doesn't.

Try *fnt ^= 0xFF

Nope ignores that as well.

In the assembler listing, the inverted number is put into the INDF 
register and is just left there.

;~ Line : 00057 (*fnt)^= 0xFF;

bcf STATUS,IRP
movlw 39
call LoadWD
movfw ACC

bcf STATUS,IRP
btfsc ACC+1,0
bsf STATUS,IRP
movwf FSR
movlw 255
xorwf 0

;~ Line : 00058 }

SETPCLATH GLCD_disp_char,0,0
L000153:

;~ Line : 00059 


;~ Line : 00060 for (indx = 

Time for bed, look at it fresh in the morning.

Colin
--
cdb, colin@btech-online.co.uk on 9/26/2009
 
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