On 2017-11-27, at 12:42:56, Ed Jaffe wrote: > On 11/27/2017 11:22 AM, John McKown wrote: >> ​BDAM is a "traditional" access method, like BSAM. So it cannot be _easily_ >> used by >> AMODE(31),RMODE(31) programs. > > Whaaaat?! AMODE(31) callers were supported by the very, very first release of > DFSMS! > > Gosh I can't remember how many decades ago that was, but it's been a long, > long time... > Can all the data areas; DCB, exits, DECB, IOB, Buffers, ... reside above the line?
How much recoding of a 370 program is needed to support this? In days of yore, when I was trying to support both 370 and XA, I found it simplest to keep all the I/O stuff below the line and call a 31-bit interface interface routine which set AMODE 24 and branched to 24-bit code. -- gil
