Can you explain what you are trying to do?
Most of the time, porting BASIC directly to axe doesn't result in the best code possible.
Edit: so i assume you want to convert an 8*8 image to its hexadecimal representation. If you are creating an image editor, i would recommend storing the image separately in ram, and drawing it onto the screen with the sprite command.
Anyways, if you have an 8*8 image, packed into 8 bytes, converting it into a hexadecimal string would look something like:
Code:
ClearHome
ImagePointer-1->I
L1-1->P
For(8)
{I+1->I}->A and 15+'0'->{P++}
A/16+'0'->{P++}
End
0->{L1+16}
And now the hex string is in L1.
Runer could probably make it better >.<
Edit 2:
BTW, is this how you are supposed to use Select runer112?
Code:
ClearHome
ImagePointer-1->I
L1-1->P
For(8)
Select({I+1->I}, and 15+'0'>{P++})/16+'0'->{P++}
End
0->{L1+16}
If so, this is smaller. 
