- Oberon - mailman3.inf.ethz.ch

Emulating interrupts in oberon-risc-emu as in the RISC5 specification
by Charles Perkins 31 Mar '21

31 Mar '21

Hello Everybody, I wanted to explore interrupt handling in Oberon and I discovered that Peter De Wachter's excellent emulator did not implement them, which is not surprising, as the current Project Oberon source doesn't use them as far as I can tell and the only example source code showing how to use interrupts is the TestInt module on Professor Wirth's own 2018 update to RISC5: https://people.inf.ethz.ch/wirth/ProjectOberon/RISC5.Update.pdf Since I wanted to compile and run that small example I forked Peter's emulator and added support for Interrupts in a branch here: https://github.com/io-core/oberon-risc-emu (only a few small changes were needed.) With those changes I am able to compile the TestInt module and execute it in the emulator using the 2019 disk image in the repo. Emulated LEDs update once per second as expected. I don't intend to maintain a fork of Peter's emulator, I just wanted to experiment with interrupts and share the implementation in case anyone else is interested. Best Regards, Chuck

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A network connection for ETHO on QEMU.
by peter＠easthope.ca 15 Mar '21

15 Mar '21

No problem running ETHO on QEMU in Debian 10. Creation of a network connection from the ETHO guest system to the QEMU host is giving difficulty. I expect to use the NetNe2000 driver. This qemu command fails as follows. alias etho='qemu-system-i386 \ -drive file=/dev/KingstonCF,media=disk,format=raw \ -vga std \ -boot order=c \ -netdev bridge,id=bridge0,br=br0 \ -device ne2k_pci,netdev=bridge0 \ ' peter@joule:/home/peter$ etho failed to parse default acl file `/etc/qemu/bridge.conf' qemu-system-i386: bridge helper failed Ideas? Thanks, ... P. L. -- cell: +1 236 464 1479 Bcc: peter at easthope. ca VoIP: +1 604 670 0140

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Re (2): Re (2): Catalog
by peter＠easthope.ca 27 Feb '21

27 Feb '21

From: Nemo Nusquam <cym224(a)gmail.com> Date: Sat, 27 Feb 2021 12:19:30 -0500 > I tried surfing there and was informed: > Authentication Required > A username and password are being requested by > https://svn-dept.inf.ethz.ch. The site says: > "ETH Zurich LDAP Authentication" For record rather than to restrict access. Credentials published at http://cas.inf.ethz.ch/projects/a2/ . --username infsvn.anonymous --password anonymous Also in the wikibook. https://en.wikibooks.org/wiki/Oberon/A2#Sources,_Tools_and_Configuration_Te… Regards, ... P. L. -- cell: +1 236 464 1479 Bcc: peter at easthope. ca VoIP: +1 604 670 0140

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Re (2): Catalog
by peter＠easthope.ca 27 Feb '21

27 Feb '21

Hello Ivan, Fri, 26 Feb 2021 at 05:32, Ivan Denisov <d.ivan.krsk(a)gmail.com> wrote: > https://oberon.org The catalog is valuable, thanks! https://oberon.org/en has a link for www.ocp.inf.ethz.ch . To my knowledge the ocp was decommissioned around the end of 2020. There is now an SVN repository. https://svn-dept.inf.ethz.ch/svn/lecturers/a2/ Regards, ... P. L. -- cell: +1 236 464 1479 Bcc: peter at easthope. ca VoIP: +1 604 670 0140

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50 years of Pascal by Niklaus Wirth
by Pablo Cayuela 26 Feb '21

26 Feb '21

https://m-cacm.acm.org/magazines/2021/3/250705-50-years-of-pascal/fulltext

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Oberon compiler construction videos
by Arthur Yefimov 26 Feb '21

26 Feb '21

Recently in Riga we started a new YouTube channel called "Programming in Oberon", where we publish our Oberon-related videos. Right now we are focused on using Blackbox to create a convenient console cross-platform Oberon compiler that would work something like fpc or gcc. The idea of starting an YouTube channel was somewhat spontaneous, so the first video starts "from the middle" and talks about recursive module traversal (creatation of a list of modules for compilation and linking). The videos are in Russian language, however we made subtitles that can be autotranslated on YouTube to any other language. I checked English, and it turned out to work quite well. I will probably also add manual English subtitles later. Here is the link: https://www.youtube.com/channel/UCfaaot6JjktvqQCUOkXxEsA/featured We will be happy to hear some comments. Best regards Arthur Yefimov

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Re (2): Re (2): Indentation in V2 sources.
by peter＠easthope.ca 15 Feb '21

15 Feb '21

From: Joerg <joerg.straube(a)iaeth.ch> Date: Mon, 15 Feb 2021 09:18:20 +0100 > If you like monospaced fonts you should adapt the font-family. > ... > <span style="font-family: Monaco, monospace; ... OK, thanks. Currently the MediaWiki module handles two cases. (1) MediaWiki.Markup reads an Oberon Text and produces markup which produces a page which imitates the original Text. ETH Oberon has the Courier font. Markup for characters in the Courier font will be tagged <span style="font-family: Courier, monospace; ...">. To my knowledge, a contemporary browser is likely to recognize "Courier"; if Courier is not available another monospace is likely to be substituted. The output syntax is in the MediaWiki module at line 37. https://en.wikibooks.org/wiki/Oberon/A2/Oberon.MediaWiki.Mod The conversion of the Text typeface attribute to the HTML tag begins at line 266. "IF extantAttr.typeface # globalAttr.typeface ..." This conversion process is satisfactory. (2) To produce markup for a text from a PDF, the original Oberon Text is not directly available. Probably typeface can be extracted from PDF; I don't know how. The PDF reader displays the document but doesn't give me attributes. Visually I can recognize serif vs. sans serif and fixed pitch vs. variable pitch. Then I can impose a typeface. My MediaWiki module has a simple means to do that; not yet in the book. My immediate question: what font-family specification for serif, variable pitch will be recognized by most browsers? An answer will allow me to complete case (2). Thx, ... P. L. -- cell: +1 236 464 1479 Bcc: peter at easthope. ca VoIP: +1 604 670 0140

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Re (2): Indentation in V2 sources.
by peter＠easthope.ca 15 Feb '21

15 Feb '21

From: "Chris Burrows" <chris(a)cfbsoftware.com> Date: Mon, 15 Feb 2021 11:44:31 +1030 > I like to use monospaced fonts when writing code so that every column > of characters is aligned. > > If I was putting code samples in Wikibooks I would follow guidelines like > those specified, for example, in the REALbasic/Style Guide: > > https://en.wikibooks.org/wiki/REALbasic/Style_Guide The OCC module is from the original _Project_Oberon_ book. I want to preserve the appearance in the PDF reasonably closely. https://en.wikibooks.org/wiki/Oberon/V2 I'd be happy to use monospace for code I've written. > The indentation probably appears more narrow because different fonts are > used. > > This is always very subjective. What I prefer could easily irritate somebody > else. I like to use monospaced fonts when writing code so that every column > of characters is aligned. > > I did try the <code> tag in the Sandbox with an Oberon example and that > inserted additional blank lines. Surrounding code with the <pre> </pre> tags > seemed to work well. The whole source is enclosed with these tags. <pre><span style="font-family: Oberon, Helvetica, sans-serif; font-size: 0.80rem; font-weight: normal; font-style: normal; color: #000000; position: relative; top: 0%"> ... </span></pre> The <pre> tag comes from the blank beginning each line in the markup. Now I remember choosing the font-family for similarity to the font in ETH Oberon. The font in the sources in _Project_Oberon_ is serif. In Linux Firefox, DejaVu serif should work. A serif variable pitch font available in all familiar browsers would be ideal but I have no idea of serif fonts in browsers in MacOS and MS Windows. Suggestions? Thanks, ... P. L. -- cell: +1 236 464 1479 Bcc: peter at easthope. ca VoIP: +1 604 670 0140

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Indentation in V2 sources.
by peter＠easthope.ca 15 Feb '21

15 Feb '21

>From chris at cfbsoftware.com Sun Jul 23 08:28:17 2017 > a) Wirth's Project Oberon: Two spaces for used for each level of > indentation. Chris, the OCC at https://en.wikibooks.org/wiki/User:PeterEasthope/sandbox is indented as you say. The indentation appears more narrow than in the original PDF. Different softwares render blanks differently. In the wikibook, four blanks per indent will yield a geometry closer to the book. Is the sandbox view tolerable? Insert more blanks? Comments? Thanks, ... P. L. -- cell: +1 236 464 1479 Bcc: peter at easthope. ca VoIP: +1 604 670 0140

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Astrobe memory footprint
by Andreas Pirklbauer 13 Feb '21

13 Feb '21

> If you are trying to make comparisons with other operating systems… Oh. That’s easy... Just replace KB with MB (or GB)..

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