[Oberon] Emulators

Skulski, Wojciech skulski at pas.rochester.edu
Wed Jul 29 15:17:06 CEST 2020


  just to make sure I downloaded the image Oberon-2016-04-18.dsk from the original PDW github. I chose the one different from yesterday to make sure it was not the image file corruption.

I put it into the same directory with Colby's JS file 200727-1854-emu.js.html. Double clicked on the html file. It opened in Firefox and displayed the menu "Select disk image...". I selected and the menu item changed to Loading... but the Oberon display did not open.

The rendition into the Firefox is working on this ancient Firefox. I can open your PNG images using your JS emulator loaded from my local disk (not from the web). Namely, I double click on your emu.html (bypassing the index.html). It opens a menu line just like Colby's. It looks identical. The same menu "Select disk image...". Under this menu there are all the PNG images *and* also the .dsk image because I added it to the JSON file. PNG images open. DSK image does not.

Summary about your JS emulator ran from the local disk: 
  1. It opens the PNG, 
  2. it does not open the DSK. 
  3. You said (excuse me if I understood wrong) that it should open either format.

Summary about your Colby's emulator ran from the local disk: 
  1. It does not open the PNG (I tried the one from your "DH Pages" directory on my disk), 
  2.  it does not open the DSK. 
  3. It expects the .dsk. This file extension is the only one on the list of extensions.
  4. The comment in the source said that it should open PDW format in two slightly different versions.


From: Oberon [oberon-bounces at lists.inf.ethz.ch] on behalf of Skulski, Wojciech [skulski at pas.rochester.edu]
Sent: Wednesday, July 29, 2020 8:49 AM
To: ETH Oberon and related systems
Subject: [EXT]  Re: [Oberon] Emulators


  now you got me confused. We had this long discussion concerning image formats. I was asking whether it is possible to modify your emulator to open the original *unpatched* image. From all that you were saying I understood that it is not only possible, but in fact it was done. The only reason to patch the images into the PNG format was that the raw format cannot be served over the web (no support for binary file transfer in IE10), while every web browser will take the PNG.

This is what I understood and yesterday wrote on my Emulators page. Is my understanding incorrect?

Concerning Colby's emulator, the comment in the text explicitly says that it can open Peter de Wachter's format. So I tried one of the images from your C page to check it out. It was not my mistake to choose this particular image.

So I am now confused.


>That is my C emulator. The images there are not patched for the
>JavaScript emulator, i.e. they won't find any SD card and therefore
>won't get very far.

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