Two Questions Regarding Data Spaces

There are various bit settings in the cvt that indicate is various
facilities are present: I can test for the presence of SUBSPACE,
I can test for LX Reuse.
.
.
Is there a bit setting in the CVT or another control block structure
that indicates the presence of DATA SPACE Services is available ?
.
.
Second When Reading About Data Spaces In Extended Addressability
it is suggested that the developer obtain an additional 4K Block
when reserving Data Space storage. This is because some Systems 
return an Origin address at 4096 and Not 0. 
.
In other words the processor does not support an Origin of 0.
>From a programming/coding perspective, can this be detected ?
.
How does the System indicate this to a programmer before the
DSPSERV macro is issued ?
.
.
Paul D'Angelo
.
.
.

----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN

Reply via email to