Any program talking to the terminal (i.e. VTAM, Session manager, ISPF,
whatever) can ask the terminal for its capabilities and the terminal
responsds with a Query-Reply block, maybe a couple of hundred bytes
long, describing all the things the terminal can do. That includes
things like the alternate screen size (mod-3, mod4, etc.), whether it
can handle extended colors, underlining, graphics, etc.
I ran a real mod-4 green screen for many years, and it probably returned
the same block every time. And the guy nearby with the color 3279
probably returned the same block for that machine - every time. But
terminal emulators aren't stuck with the same hardware emulation, so you
can click options that will alter the Query-Reply. A typical change is
the terminal model, but an emulator could (although I don't know why
anyone would want this), simulate a terminal that say, can do extended
colors but no underlining. Who knows what that might do to an
application program that isn't ready for the odd combination though.
This book (chapter 6) has a list of all the replies if you want the
gritty details.
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/CN7P4000/CCONTENTS
Here's an example of the returned data from a randomly chosen terminal
emulator:
0000 88001781 81010000 50001801 00D30320 "h..aa...&....L.."
"........P....+. "
0010 009E0258 070C0780 001181A6 00000B01 ".¦.8...+..aw...."
"...X.......ª...."
0020 00005000 18005000 18001681 86000800 "..&...&....af..."
"..P...P........."
0030 F4F1F1F2 F2F3F3F4 F4F5F5F6 F6F7F700 "411223344556677."
"(±±====(())÷÷˜˜."
0040 0D818704 00F0F1F1 F2F2F4F4 00078188 ".ag..0112244..ah"
".....=±±==((...."
0050 00010200 06819900 00001B81 85820007 ".....ar....aeb.."
"................"
0060 0C000000 00070000 0002B904 170100F1 "..........+....1"
"..........¦....±"
0070 03C30136 003F818F 0000E3C3 D7F3F2F7 ".C....a¦..TCP327"
".+.6.?....p++==˜"
0080 F040E5C9 E2E3C140 40400401 000025FF "0 VISTA ......"
"=@s+Gp-@@@....% "
0090 FF020600 00C0D59D 50000000 00000028 ".....{N+&......."
" ....++.P......("
00A0 4E6F7420 79657420 6C6F6767 65642069 "+?+.`-+.%?++-+.-" "Not yet
logged i"
00B0 6E212900 000D8180 80818586 878899A6 ">.....a++aefghrw"
"n!)............ª"
00C0 A8FFEF "y.+ " "¿ n
"
Another thing in there is the code page and character set used by the
terminal emulator, which can be picked up by the application program and
checked. For example, folks using code page 1047 might see SPUFI give a
warning that it likes code page 37 better. The 1047 SPUFI is
complaining about came from this pile of bytes - at location +6B.
[email protected] wrote:
If you can locate these manuals
IBM 3270 Information Display SYSTEM GA23-0060
IBM 3270 Information Display SyStem Data Sream Programmers Reference GA23-0059
These Are Old Publication numbers
---------- Original Message ----------
From: scott <[email protected]>
To: [email protected]
Subject: Speaking of 3270-X devices (Was: Query on OSA-ICC consoles)
Date: Sun, 12 Jun 2016 00:11:30 -0400
Where can I find more detailed information on 3270-X defined devices?
Are they queried to find out what their capabilities are dynamically?
Scott
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