Building with transistors and LED indicators is all the rage. https://hackaday.com/2016/07/06/42300-transistor-megaprocessor-is-complete/
On Mon, Apr 6, 2020 at 12:47 PM Seymour J Metz <[email protected]> wrote: > > 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 > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > 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] > > > > \---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO IBM-MAIN > > > > \---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO IBM-MAIN > > > > \---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO IBM-MAIN > > > -----BEGIN PGP SIGNATURE----- > Version: ProtonMail > > wsBmBAEBCAAQBQJei2ZhCRBiYga9B/zq3QAKCRBiYga9B/zq3RExB/0Vouer > F/v7e5U7vb+Lje1CAJrIryAkTMJBda462HJtZ4oTrzx6wwyYIN3Zg1JQXIee > /osE6jePzW2W8ujuWaPVgHFobhnw6MIzljE3szbePa9OT4RQOksRqhcib13N > pQfi055nm4R3MqHN7Pld97++o0SvJnJ1i/ZpPinHEI7GeqRKCbMXNlvB2yAV > IgV50PJIBoS7Pd5CwCUje0QPGZY7nyeufpFLDcWm5a1erDdKgJbaoo0/ugDf > chO8SjMQP0Y5SLmxxmlAqA7DJ2FYIQb4WOp1AfN1wSFagz/Yvnf053OGO4iJ > td92RJtTGR3YBbcy4dphtWQnLYtdoszw1kQK > =4+29 > -----END PGP SIGNATURE----- > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
