I would start bottom up from the gates, which can be built with radically
different technologies, e.g., Vacuum tubes ("valves") versus hydraulic logic.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Discussion List [[email protected]] on behalf of
Adam Jacobvitz [[email protected]]
Sent: Monday, April 6, 2020 1:26 PM
To: [email protected]
Subject: Re: Free 3270 emulator for Mac OS
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Back when I was in grad school I used to debate with people which is the best
way to teach programming and general purpose computing: from the transistor up
or the language down. Both camps had valid points.
Sent from ProtonMail mobile
\-------- Original Message --------
On Apr 6, 2020, 10:04 AM, Seymour J Metz < [email protected]> wrote:
>
>
>
> I hope not.
>
>
> \--
> Shmuel (Seymour J.) Metz
> http://mason.gmu.edu/~smetz3
>
>
> \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
> From: IBM Mainframe Discussion List <[email protected]> on behalf of
> Charles Mills <[email protected]>
> Sent: Monday, April 6, 2020 12:37 PM
> To: [email protected]
> Subject: Re: Free 3270 emulator for Mac OS
>
> If there's a market for BSC-based 3270 emulators, let me know. I've written
> two. (Well, one I only wrote the BSC to/from screen buffer part; my
> associate John wrote the keyboard and display part.
>
> <g>
>
> Charles
>
>
> \-----Original Message-----
> From: IBM Mainframe Discussion List \[mailto:[email protected]\] On
> Behalf Of Timothy Sipples
> Sent: Sunday, April 5, 2020 6:59 PM
> To: [email protected]
> Subject: Re: Free 3270 emulator for Mac OS
>
> Seymour J. Metz wrote:
> >A few more notes on nomenclature. TN3270 and TN3270E (upper case)
> >are protocols published by the IETF; programs implimenting those
> >protocols are TN3270 clients, not TN3270 emulators. TN3270 clients
> >are not 3270 emulators, because they do not support any of the link
> >protocols that real 3270s do, e.g., BSC, CUT, DFT, SDLC.
>
> I disagree with the last sentence, and IBM (among many others) does too,
> evidently. You'll see "emulator" in the IBM Host On-Demand (HOD)
> documentation, for example. I don't recall HOD ever communicating via BSC
> or SDLC. "Emulator" has a different meaning than the word "clone," which
> is the word you might have been looking for.
>
> If you want to be pedantic about it, per Wikipedia "IBM 3270" refers to a
> family of IBM terminals ("displays"), printers, and controllers (following
> the IBM 2260 family) that IBM refined and improved over several years. All
> modern "3270" terminal emulators are necessarily partial emulators in
> certain respects, but practically all of them exceed the capabilities of
> the last physical/classic 3270 family of products in certain respects,
> too.
>
> Anyway, if you want to describe various 3270 emulators as "partially"
> emulating the IBM 3279 (for example), that makes sense to me. However, the
> word "emulator(s)" is perfectly acceptable and appropriate in this context
> \-- in my view and with broad consensus agreement as far as I can tell.
>
> "TN3270 emulator" (or "TN3270E emulator") is confusing and not generally
> correct. If you're using TN3270(E) protocol then you're probably not
> emulating it.
>
> A TN3270(E) client need not be a 3270 terminal emulator. I think most
> people would not describe an automated test tool that works via a
> TN3270(E) connection as a "3270 emulator," for example. They'd probably
> describe it as a "3270 test(ing) tool."
>
> \- - - - - - - - - -
> Timothy Sipples
> I.T. Architect Executive
> Digital Asset & Other Industry Solutions
> IBM Z & LinuxONE
> \- - - - - - - - - -
> E-Mail: [email protected]
>
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