July 2020 - Oberon - mailman3.inf.ethz.ch

Re: [Oberon] Emulators
by Jörg 14 Feb '22

14 Feb '22

Wojtek > How can I proceed, in practical terms, to use your JS emulator for development? Perhaps we should start discussing, WHAT you want to change. At the moment I see three different levels of HW modifications: easy, more difficult, impossible. Basically, see an emulator as virtualization. In virtualization you have a host machine (where the emulator runs on) and a guest machine (this is the FPGA board). I ignore „containers“ at the moment Easy: if you want to extend the RISC-5 instruction set in Verilog (eg add an autoincrement instruction) the modification of the emulator is rather straight forward. I neglect the fact that you have to modify the Oberon-07 compiler to use this new instruction, because this is not important for the emulator. More difficult: if you want to add IO mapped HW (eg Ethernet or Wifi) or memory mapped HW (eg color display) to your FPGA and the host machine has an equivalent of this HW, with a little bit of effort the emulator can be modified to map the IO register commands or new memory layout to the corresponding host HW. Impossible: if you want to add HW to your FPGA and the host machine does not have an equivalent HW (eg a neutrino sensor) then it‘s impossible for the emulator to mimic the new FPGA HW. br Jörg

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Wanted: Oberon Syntax in TextMate, Sublime Text or Atom Grammar
by Treutwein Bernhard 01 Jan '22

01 Jan '22

Does somebody have grammars for Oberon / Oberon-2 / Component Pascal / Active Oberon as grammar for TextMate / Sublime Text / Atom Background: Github wrongly classifies Oberon / Oberon-2 / Component Pascal / Active Oberon as Modula-2. I opened quite some tiome ago an issue in the github/linguist project (https://github.com/github/linguist/issues/3888) and they don't accept EBNF grammars. -- Bernhard Treutwein

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Re (2): Names and genealogies.
by peter＠easthope.ca 21 Oct '20

21 Oct '20

From: Joerg <joerg.straube(a)iaeth.ch> Date: Mon, 22 Jun 2020 22:48:04 +0300 > So just forget S3, System3 and other names you might have come along OK, thanks Joerg. in the front page, https://en.wikibooks.org/wiki/Oberon , I've made the changes "S3" => "ETH Oberon". The former page https://en.wikibooks.org/wiki/Oberon/S3 is now https://en.wikibooks.org/wiki/Oberon/ETH_Oberon . Sub-pages also renamed accordingly. The change is also done in https://en.wikibooks.org/wiki/Oberon/sitemap . Several red links remain there until I can salvage the pages. Meanwhile, most can be reached via the WayBack link in the green box. I have not proof read yet and am unlikely to have much time before winter weather returns. Will try to correct any erros reported. Regards, ... P. -- https://en.wikibooks.org/wiki/Medical_Machines https://en.wikibooks.org/wiki/Oberon Tel: +1 604 670 0140 Bcc: peter at easthope. ca

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Linux A2 (Ubuntu 20.04 LTS), fonts too small to read
by R. S. Doiel 10 Sep '20

10 Sep '20

Hello everyone, I am new to Oberon so this is very much a new user question I am afraid. I am trying out A2 on Ubuntu 20.04 LTS laptop. My vision is not what it was when I was younger and the 12 point fonts in the A2 desktop are tiny. Short of downgrading the resolution of my laptop's display before starting aos is there a way to tell A2 to use larger fonts or is there a way to "zoom in" on the screen so I can read things? Thanks for the help in advance. All the best, Robert

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Re (2): Oberon text files
by peter＠easthope.ca 05 Aug '20

05 Aug '20

<name>.Text wasn't a problem back in the 1980s when encountered by students in programs of computer engineering and computer science. The confusion and controversy occurs in the wider population. Particularly for self-instructed individuals. Consider it progress. People beyond or outside advanced programs are learning. =8~) From: Treutwein Bernhard <Bernhard.Treutwein@...Uni-Muenchen.DE> Date: Thu, 30 Jul 2020 11:30:07 +0000 > BlackBox/Oberon-F files, which are inherently similar to Oberon Text > files have the extension odc. odc = Oberon document? I've added .odc to the glossary ( https://en.wikibooks.org/wiki/Oberon#Glossary ) but it's rather cryptic. What is a BlackBox/Oberon-F file? The glossary should explain better. The Text type and the name extension are distinct concepts. What about .ot as an alternative to the .Text name extension? Copyright.ot, Install.Oberon.ot, System.ot, ...? A name change is disturbing and always finds opposition. =8~| Retention of a name is worse? ... L. -- https://en.wikibooks.org/wiki/Medical_Machines https://en.wikibooks.org/wiki/Oberon Tel: +1 604 670 0140 Bcc: peter at easthope. ca

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Mystery page.
by peter＠easthope.ca 02 Aug '20

02 Aug '20

According to arhive.org a page with this URL existed. http://www.ethoberon.ethz.ch/compiler/index-Dateien/filelist.xml But I haven't found it in archive.org. Never recorded or it was deleted? What was that? Thanks, ... L. -- https://en.wikibooks.org/wiki/Medical_Machines https://en.wikibooks.org/wiki/Oberon Tel: +1 604 670 0140 Bcc: peter at easthope. ca

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PO2013 compiler and SET operations
by Andreas Pirklbauer 30 Jul '20

30 Jul '20

> The correct sequence should be "ANN R0,R1,R0”. I > explored this with Andreas' Extended Oberon compiler. Should be fixed now.

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Re: [Oberon] Oberon text files
by peter＠easthope.ca 30 Jul '20

30 Jul '20

Hello All, From: Paul Reed <paulreed(a)paddedcell.com> Date: Wed, 29 Jul 2020 16:49:13 +0100 pr> Perhaps, as a nice exercise, someone would like to write a (maybe even pr> bidirectional) Oberon-Text to Markdown-subset converter ... da> Yet another language? =8~? https://en.wikipedia.org/wiki/Markdown https://en.wikipedia.org/wiki/Tower_of_Babel https://en.wikipedia.org/wiki/Yacc da> In case someone tackles the exercise, some ideas can be pinched here. https://en.wikibooks.org/wiki/Oberon/A2/Oberon.HTML.Mod https://en.wikibooks.org/wiki/Oberon/A2/Oberon.HTML.Tool https://en.wikibooks.org/wiki/Oberon/ETH_Oberon/MediaWiki.Mod https://en.wikibooks.org/wiki/Oberon/A2/Oberon.MediaWiki.Mod Desktops.OpenDoc converts HTML to Text. Bidirectionality already. pr> ... and we can standardise on README.md in future. da> I'd be satisfied with README.html. If used in a sensible style, ASCII da> display of HTML can be read, ignoring markup. Or render it da> with Desktops.OpenDoc. It's easy! It's fast! Try it! You'll like da> it! (marketing slogan from the 1960s.) da> The only practical means to put sources in the wikibook is via da> automated conversion of Text to MediaWiki markup. I wrote MediaWiki da> out of necessity. If a simpler means were available, I'd be happy to da> adopt it. One way to resolve this name squabble is to choose a more distinct name. OText? OTxt? OTx? ObT? Plenty of choices out there. Regards, ... Devil's Advocate https://en.wikipedia.org/wiki/Devil's_advocate -- https://en.wikibooks.org/wiki/Medical_Machines https://en.wikibooks.org/wiki/Oberon Tel: +1 604 670 0140 Bcc: peter at easthope. ca

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PO2013 compiler and SET operations
by Michael Schierl 30 Jul '20

30 Jul '20

Hello, Today I stumbled over some oddity when trying to mask bits out of INTEGERs via SET operations. Consider this short example module: MODULE X; IMPORT SYSTEM; PROCEDURE SetDiff(a, b:SET): SET; BEGIN RETURN a - b END SetDiff; PROCEDURE Mask1(a, b: INTEGER): INTEGER; BEGIN RETURN SYSTEM.VAL(INTEGER, SetDiff(SYSTEM.VAL(SET, a), {b .. b + 7})) END Mask1; PROCEDURE Mask2(a, b: INTEGER): INTEGER; BEGIN RETURN SYSTEM.VAL(INTEGER, SYSTEM.VAL(SET, a) - {b .. b + 7}) END Mask2; PROCEDURE Test1*; BEGIN ASSERT(Mask1(12345678H, 8) = 12340078H); END Test1; PROCEDURE Test2*; BEGIN ASSERT(Mask2(12345678H, 8) = 12340078H); END Test2; END X. My expectation would be that both Mask1 and Mask2 perform the same operation, and therefore both ASSERTs hold. Yet Mask2 returns 0 instead of 12340078H. Tested with both the original PO2013 compiler and Andreas' Extended Oberon compiler. Any explanation? Regards, Michael

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Text vs. txt; was Re (2): Links for the Oberon-2 report.
by peter＠easthope.ca 29 Jul '20

29 Jul '20

Hello Liam, From: Liam Proven <lproven(a)gmail.com> Date: Wed, 29 Jul 2020 16:32:38 +0200 > I fully understand that this is not true in Oberon but I absolutely do > think that it is fair, reasonable and understandable to see a file > called "README.Text" and expect it to contain plain text! Considering this, Text is discussed on the front page of the Wikibook. https://en.wikibooks.org/wiki/Oberon#Oberon_Text A novice might catch that before abandoning Oberon. Suggestions to improve the section are welcome. The compilers ignore niceties of typography. Building an Oberon system without changing the compiler and with strictly ASCII txt files is conceivable. An ETH Oberon derivative might attract significant attention. ... =8~) Regards, ... Lyall E. -- https://en.wikibooks.org/wiki/Medical_Machines https://en.wikibooks.org/wiki/Oberon Tel: +1 604 670 0140 Bcc: peter at easthope. ca

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