Yes, I've switched back to CLI. Thanks, Dave Clark
On Mon, Feb 16, 2026 at 4:40 PM Seymour J Metz <[email protected]> wrote: > The TM instruction only tests Those bits tat have a 1 in the field. With > a mask of C4 it is testing bits 0, 1 and 5; it is not testing bit 7. That's > why it gets the same CC for C4, C5, C6 and C7. > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > עַם יִשְׂרָאֵל חַי > נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר > > > > > ________________________________________ > From: IBM Mainframe Assembler List <[email protected]> on > behalf of David Clark <[email protected]> > Sent: Monday, February 16, 2026 2:45 PM > To: [email protected] <[email protected]> > Subject: Apparent Test Under Mask Failure > > > External Message: Use Caution > > > Can someone please explain to me how the following fails to drop through to > the actual test for C5? The request at d'8000' is 'E' (x'C5', b'11000101') > but the code is taking the 'D' (x'C4', b'11000100') branch. Why? > > The condition code should result in mixed -- not ones. Am I going to have > to change from bit mask testing to 'CLI' testing? > > 000872 91C4 8000 00000 1842+ TM > REQU_DELETE,L'REQU_DELETE > 000876 A714 0124 00ABE 1843+ JO TXTDLET > ...snip... > 0008C2 91C5 8000 00000 1994+ TM > REQU_2EBCDIC,L'REQU_2EBCDIC > 0008C6 A714 02D7 00E74 1995+ JO TXT2EBC > > The bit mask flags are defined as follows--using my own macros based on the > late Dr. John Ehrman's SHARE presentation on the subject. > > 000000 300=TXTREQU DS CL1 > 00000 000C4 308+REQU_DELETE EQU *-1,C'D' > 00000 000C5 310+REQU_2EBCDIC EQU *-1,C'E' > ...snip... > > Sincerely, > Dave Clark > > >
