All our code is 31-bit; we acquire 24-bit storage to hold control blocks
that have to be below the line (3-byte addresses).
On 2017-11-27 3:02 PM, Paul Gilmartin wrote:
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
Gary Weinhold
Senior Application Architect
DATAKINETICS | Data Performance & Optimization
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