On Thu, 25 Apr 2013 08:43:49 -0400, John Gilmore wrote: >There is in fact an advantage to using a sign value of F, 1111b, >instead of C, 1010b in some circumstances. > >See the programming note midway in the first column of page 8-3 of the >current PrOp.
Do you mean the note that reads, "Programming Note: Since 1111 is both the zone code and an alternate code for plus, unsigned (positive) decimal numbers may be represented in the zoned format with 1111 zone codes in all byte positions. The result of the PACK instruction converting such a number to the signed-packed-decimal format may be used directly as an operand for decimal instructions." I don't see what advantage you mean, unless you are simply saying that there is no need to adjust the sign bits. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
