Thanks all,
I found what I was looking for in an old copy of IBM 3480 Magnetic Tape
Subsystem User's Reference GC35-0099-3 under the section that talks
about the MSGDISP macro. It actually had a figure that described CSECT
IGXMSG01 that validated what I thought I knew.
Tony Thigpen
Alan Altmark wrote on 7/21/21 7:47 AM:
On Tue, 20 Jul 2021 10:03:18 -0400, Tony Thigpen <[email protected]> wrote:
Is there actually any real IBM doc that describes what may be displayed
by z/OS on the little display on a 3480/3490/3590 tape drive?
Yes. I'm looking at a copy of the IBM 3490 Hardware Reference, GA32-0127. The
Load Display CCW supports (from any OS, not just z/OS):
A-Z 0-9 # $ @ , . / ' ( ) * & + - = ยข % | : _ < > ? ;
Any service that z/OS provides that allows an application to interact with the
display may be more restrictive.
The display consists of two 8-character messages. If, how, and when those
messages are displayed is the subject of a control character that the host
sends along with the messages.
There is at least one VTS-style product on the market that uses the displayed
value as the requested volser whenever the message includes the control to
index the (virtual) autoloader. This allows systems without DFSMS and
'modern' library controls to still be able to request a tape mount from the
emulated library.
Alan Altmark
IBM
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