May 2021 - 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: [Oberon] _Compiler_Construction_ by Niklaus Wirth
by peter＠easthope.ca 17 Nov '21

17 Nov '21

P.s. for interest. From: peter(a)easthope.ca Date: Thu, 07 Jan 2021 08:37:22 -0800 > Currently the cheapest copy of _Compiler_Construction_ is 43.09 US$, > delivery in the USA included. Appears the copy posted at 43.09 US$ was sold that day. Subsequently the vendor listed another copy at 105.61 $US. The book market can be as volatile as the stock market. Regards, ... P. L. -- Tel: +1 604 670 0140 Bcc: peter at easthope. ca

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Project Oberon on current 'off-the-shelf' hardware
by Chris Burrows 02 Jun '21

02 Jun '21

To help new users get started with RISC5 hardware we have made available, free of charge, a Micro SD card disk image and an FPGA bitstream file to run the Project Oberon Workstation 'out-of-the-box' on either of Digilent's latest Artix 7-100T FPGA development boards. These and the associated Pmod modules can be purchased from a number of Digilent's distributors (e.g. Mouser). This release is based on the latest official Project Oberon Workstation sources (March 2020) and RISC5 Verilog sources (September 2018) downloaded from Prof Wirth's website. The entire source code of the system, including the compiler, is included on the disk image. Go to https://www.astrobe.com/RISC5/Workstation.htm for more details including photos of the boards, and to request a copy of the system. Regards, Chris Burrows CFB Software https://www.astrobe.com

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Re (2): [EXT] Re: Project Oberon on current 'off-the-shelf' hardware
by peter＠easthope.ca 01 Jun '21

01 Jun '21

From: "Skulski, Wojciech" <skulski(a)pas.rochester.edu> Date: Mon, 31 May 2021 04:29:39 +0000 > Are you not worried that our mailing lists may one day perish like > comp.lang.oberon? The foremost motivation for creating the wikibook! Too many documents already in peril. Currently, working on the Oberon Tutorials written or organized by Andr Fischer. To whatever extent Chris and others will allow, I'm willing to incorporate further information. In fact, it's a wiki. More participation would be invaluable. Regards, ... P.L. -- tel: +1 604 670 0140 Bcc: peter at easthope. ca

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Re (2): The SVN repository for A2.
by peter＠easthope.ca 31 May '21

31 May '21

peter at easthope.ca peter at easthope.ca Mon May 31 21:26:54 CEST 2021 > That is the system (Debian) locale or SVN locale? Subversion has no locales that I can see. Should have looked before asking. In fact the locales package was absent. After installing it, setting en_US.UTF-8 and rebooting, the A2 repository updated successfully. For the documentation, another potential snag to mention. Thanks, ... P.L. -- tel: +1 604 670 0140 Bcc: peter at easthope. ca

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Re (2): The SVN repository for A2.
by peter＠easthope.ca 31 May '21

31 May '21

Michael, Thanks for the detailed explanation. > Check your locale settings and use an UTF-8 locale if possible. So > something like en_US.UTF-8 instead of en_US. Depending on your distro > you may have to run locale-gen or similar to generate it. That is the system (Debian) locale or SVN locale? Thx, ... P. -- tel: +1 604 670 0140 Bcc: peter at easthope. ca

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The SVN repository for A2.
by peter＠easthope.ca 31 May '21

31 May '21

Hi, An attempt to clone the SVN repository for A2 appears to have not completed properly. "svn cleanup" gives this result. peter@joule:/home/peter/a2$ svn cleanup . svn: E155009: Failed to run the WC DB work queue associated with '/home/peter/a2 ', work item 15168 (file-install 44 UnixAos/DarwinA2 Installer/A2 64.app/Icon{U+ F00D} 1 0 1 1) svn: E000022: Can't convert string from 'UTF-8' to native encoding: svn: E000022: /home/peter/a2/UnixAos/DarwinA2 Installer/A2 64.app/Icon{U+F00D} I guess the resolution is simple enough but I'm out of my depth. Ideas? Tips? Thx, ... P.L. -- tel: +1 604 670 0140 Bcc: peter at easthope. ca

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Usenet group comp.lang.oberon is no longer accessible
by Chris Burrows 30 May '21

30 May '21

The Usenet group 'comp.lang.oberon' which I normally access through Google Groups has recently become unavailable with the message: "Banned content warning: comp.lang.oberon has been identified as containing spam, malware, or other malicious content." https://groups.google.com/g/comp.lang.oberon While it is true that spammers occasionally attacked this group (I usually reported such attacks - maybe I shouldn't have?) there was about 30 years' worth of historically significant discussions about Oberon contained in the archived messages so it is an extreme case of 'throwing the baby out with the bathwater'. I reported the access problem to Google Groups about a week ago but haven't heard back yet. Does anybody know how to restore access to this group? If you are unfamiliar with what I'm talking about, see the similar Usenet discussion group comp.lang.modula2 which is still active and accessible: https://groups.google.com/g/comp.lang.modula2 Thanks, Chris Burrows CFB Software https://www.astrobe.com

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PO 2013 allows one to "override" predefined procedures and functions
by Andreas Pirklbauer 29 May '21

29 May '21

It depends on the system: a) In PO2013/Oberon-07, the scope rules in ch.4 of the language report state that “the scope extends textually from the point of the declaration to the end of the block (procedure or module) to which the declaration belongs and hence to which the object is local. example b) In A2/Active Oberon, the scope rules in ch.3 of its language report state that “the scope of an item x is the smallest (w.r.t. nesting) block (module, procedure, record or object) in which it is declared. The item is local to this scope. Scope rules are: 1. No identifier may denote more than one item within a given scope. 2. An item may be directly referenced within its scope only. 3. The order of declaration within a scope does not affect the meaning of a program. By “should?” I meant “what is a sensible choice?”. I can certainly live with both definitions a) and b) above. To the best of my knowledge, definition a) has been used in most implementations since Pascal days (as it is easy to implement in single pass compilers), but b) appears equally valid. -ap > Is there a specific part of the Oberon Language report that prompts > you to ask this question? If not, why should it not be allowed? > > Regards, > Chris Burrows > CFB Software > https://www.astrobe.com > > > > On Sat, May 29, 2021 at 12:23 PM Andreas Pirklbauer wrote: > > > > By contrast, should the following be allowed? > > > > MODULE M; > > > > VAR ch: CHAR; > > CHAR: INTEGER; (*this is allowed in PO 2013*) > > > > BEGIN CHAR := 1 > > END M. > > > > -ap > >

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