Bit 12 was repurposed on S/370 came out, to indicate 370 BC/EC PSW mode. https://en.wikipedia.org/wiki/IBM_System/360#Notes On Mon, Nov 19, 2018 at 4:39 PM Pew, Curtis G <[email protected]> wrote: > > On Nov 19, 2018, at 4:26 PM, Steve Thompson <[email protected]> wrote: > > > > S/360 machines I worked on had a switch in the PSW to set them in ASCII > > mode. I don’t remember or know of any software that made use of this. So > > that bit was eventually required to be ON to force DAT or XA. I have > > forgotten what that bit was “stolen” for now. > > > > Right. The expectation was that routines would check the bit and generate > output in the appropriate codeset, and eventually everyone would be using > ASCII. Instead, everyone ignored the bit and generated EBCDIC, so the bit was > reused for something else (I can’t remember what either.) > > > -- > Pew, Curtis G > [email protected] > ITS Systems/Core/Administrative Services > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN
-- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
