You're not on the right track. Look at the ISDEC bif on page 352 of the current HLASM LR.
|&digits setb ISDEC(<whatever>) iff <whatever> is a digit string usable after conversion as the fullword value of an arithmetic set symbol, the binary/boolean set symbol &digits is set equal to boolean 1. Otherwise it is set equal to boolean 0. John Gilmore, Ashland, MA 01721 - USA
