On Mon, 19 Nov 2018 22:39:08 +0000, Pew, Curtis G wrote: >On Nov 19, 2018, at 4:26 PM, Steve Thompson wrote: >> >>S/360 machines I worked on had a switch in the PSW to set >>them in ASCII mode. >> > >Right. The expectation was that routines would check the bit >and generate output in the appropriate codeset,
No. It was the other way around. The ASCII bit was to change the behavior of certain instructions so that either ASCII or EBCDIC could be used. In particular, EDIT, EDMK, and UNPK would generate zone codes of 5 in ASCII mode and F in EBCDIC mode. In addition, the sign codes that are generated in decimal arithmetic were different depending on the setting of the ASCII bit. In any case, I don't know how one would test the value of the bit. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
