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TSO and the STAX Assembler Macro


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mxgdontmics

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Joined: 15 Jun 2020
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PostPosted: Mon Aug 10, 2020 10:50 pm
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steve-myers wrote:
mxgdontmics wrote:
... Did say, a period 3277 terminal user have to use the RESET-PA1 key sequence to do program interrupts?
To tell the truth, I'm no longer certain about my statement that 3270 keyboards did not have an ATTN key. While I could not find a clear picture on the net, at the top of the column of keys on the left side the keyboard a key does seem to be labeled ATTN.

For a brief period of time during my time with a <large defense contractor> I used a 3270 PC with the 24 function key keyboard. In fact it was my first time with a directly attached PC based emulator although I had used a couple of dialup emulators in the 1980s. This was '90 / '91 and maybe into '92 or even '93. Subsequently I used several IBM emulators with coax based LAN and OS/2. Very late I used the PCOMM emulator bundled into OS/2 Warp 4 with TCPIP. Then the <large defense contractor> sold most of us mainframe types off to IBM who fired most of us after about 18 months.

The COAX based emulators saved my b*** one day when the MVS IP stack broke and I was one of the few people that could still get into TSO to look over things.


I could not find an ATTN key on this image of a 3277.

vintagecomputer.ca/wp-content/uploads/2017/02/IBM-3277-terminal-profile.jpg

The first terminal I could find with an ATTN key is the 3278 which was introduced in 1980. MVS 3.8, where the ATTN key seems to be ignored under TSO, was introduced ~1981.
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steve-myers

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PostPosted: Tue Aug 11, 2020 6:23 am
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Your 3270 image is the best I've seen. I agree the top left key does not seem to say ATTN. It might even say Clear! I had access to a real 3290 from 2000 through 2007, but never once used it.

I think MVS 3.8 might have been earlier than '81. By then the TCAM based TSO was pretty much history; we had switched to TSOVTAM by the late 1970s. I don't know whether your MVS 3.8 uses VTAM or TCAM. Prejudice says TCAM, but I don't know. I think VTAM was always an addon, but I don't know. If it is an addon, then it likely is not in the free 3.8.
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mxgdontmics

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PostPosted: Tue Aug 11, 2020 8:11 am
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MVS3.8j can use both (default is VTAM) but I don't know how much it has been modified or enhanced to bring it back alive. A lot of software has been written to reverse-engineer non-public-domain features. There are two SPF-like options that are very nice, for example. The SPF editor is an excellent work-alike.
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hankoerlemans

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PostPosted: Mon Sep 21, 2020 11:53 am
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Hi guys,
not sure if you've resolved this but please take a look at the CLSTATTN operand of the STAX macro.
Trying to wade through doc and memories from 2004 but I think the gist of it is that your application STAX needs to be at the top of the pile using this parm.
Otherwise you are at the mercy of whatever CLIST, TSO and ISPF processing has occurred before your program has even loaded - let alone received control.
Hope that's of use.

Hank
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