Olin said: > Yes they can, since CBLOCK is for defining enumerated constants and has > nothing to do with RAM addresses. Actually, although CBLOCK is certainly very useful for defining enumerated constants, I believe it was likely originally introduced as a convenient way to assign addresses to variables. Remember, that in most early (absolute) assemblers, there is no 'typing' of expressions, and thus it is not possible to distinguish a memory address from any other constant. This was certainly true in the early 8080/Z80 assemblers I used. -- Bob Ammerman RAm Systems -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist