On Sun, Jan 16, 2022 at 09:12:22PM +1100, Attila Fogarasi wrote:
> The 42xx printers are dot matrix that were primarily meant to be used by
> non-mainframe hosts so they come in a variety of configurations to emulate
> asynchronous devices.

I am aware the 4224 came in a number of configurations. When I got it, 
it had a (broken) twinax interface in it, intended for an AS/400. I 
found a 3270 coax interface that I put in, which doesn't yield any error 
messages on the printer. As mentioned, the printer is recognized by the 
3174 without issues, see [1], port address 03.
As far as I know the 4224 came also in IEEE-1284 and ethernet variants.  
Not sure about EIA-232.

> You might have one that is not usable with OS/390 without special 
> hardware (there is an adapter card on the 3174 for it, for example.

Are you referring to the Asynchronous Emulation Adapter for the 3174? I 
am aware it exists, but I don't have one. It adds EIA-232 ports to the 
3174.  Probably not applicable in my case anyways, as my 4224 has a 3270 
coax port.

> You'd have to determine exactly what model of 4224 you have, and
> then configure the 3174 appropriately.

I don't think there is much to do on the 3174 really, at least I haven't 
found any configuration screens that seem relevant.

> I don't think it is a VTAM logmode issue (yet).  You've picked about 
> the most difficult printer type to use, might be a lot easier to get a 
> 3287 etc.

The 3287 is a neat device, difficult to find though. The 4224 is what I 
have.

> The 4224 claim to fame was that
> it could handle a high volume of dot matrix multi-part form printing at
> high speed.

True. 

> Unlikely to be useful these days :)

This is an archaeological activity, not a production deployment :-)

At the moment I do not have enough knowledge about how printing works 
under MVS-type operating systems. Assuming a printer connects to VTAM 
successfully, then what? How do I 'send' something to a printer? This is 
probably described in an IBM document somewhere, but I haven't found 
anything helpful so far.

Thanks for sharing your thoughts!

-Alex

[1] https://ahuemer.xx.vu/volatile/2022-01-14-UZ89Q9phAV0/4224_3174.jpeg

> 
> On Sat, Jan 15, 2022 at 6:32 AM Alexander Huemer <[email protected]>
> wrote:
> 
> > Blast from the past, I know. Maybe somebody here remembers how this is
> > done.
> > I have a 4224, connected to a 3174 that is talking APPN to OS/390. The
> > printer registers successfully on the 3174, I see a 'p' at the port that
> > it is connected to in the 'Status Summary' screen of the 3174.
> > Searching for documents that would explain how OS/390 / VTAM is to be
> > configured, I didn't find much.
> > [1] provides guidance in regard to a MODEENT macro that is supposed to
> > work.
> > But, where to go from there? I found [2], but RSCS seems to be a VM-only
> > thing.
> > I assume I'll have to configure the thing somehow in VTAM, though there
> > must be more to it I think.
> > If anybody can point me to relevant documents or has a 20 year old
> > wrinkled-up cheat-sheet in their deskdrawer, I would appreciate a little
> > help.
> >
> > -Alex
> >
> > [1] https://www.ibm.com/docs/en/gddm?topic=gddm-4224-ipds-printer
> > [2]
> > https://www.ibm.com/docs/en/zvm/7.2?topic=connections-sna-3270-printer-support
> >
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