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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Uroš,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The overall of creating the emulator is to have a very fundamental understand of the architecture so that in the future a hardware replica can be created.
With that in mind, we want to create the emulator as close to the internal functionality of the original WITCH. Because so many things are not know about the WITCH, we completely expect to discover aspects of the design while working on the emulator. So to
answer your question: we want to be as close as possible to the original implementation.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The WITCH uses several different I/O devices. First being punched paper tape readers. Once real tape readers are available and can be attached to the
minnowboard max, the emulator should be able to support reading from the. In addition, there are two output devices, including a teletype printer and a punch paper tape printer. These too should be coded in such a way that they could either be simulated hardware
or real hardware connected to the minnowboard max.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This is something we are going to need to decide on prior to beginning the project.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"><span style="mso-list:Ignore">4)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">As stated above, we’d like to understand the architecture as much as possible so simulating the pulses is important to the overall design.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"><span style="mso-list:Ignore">5)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Indeed we attempted visualize the dekatrons as part of the first emulator, however we found that it filled up the display pretty quickly. If we can
get something together that is visually small enough and still provide valuable information, it is acceptable.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Dave Anders<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> elinux-MinnowBoard [mailto:elinux-minnowboard-bounces@lists.elinux.org]
<b>On Behalf Of </b>Uros Tesic<br>
<b>Sent:</b> Tuesday, March 17, 2015 6:44 PM<br>
<b>To:</b> elinux-minnowboard@lists.elinux.org<br>
<b>Subject:</b> Re: [MinnowBoard] GSoC-2015 WITCH-on-a-Board<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Sorry for bothering you again, but I started writing the proposal, and I have a few questions.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">1) The paper describes steps on the higher level (eg. implement division by chain subtraction). Are there any rigid rules that have to be followed (eg. surviving flow diagrams
from the WITCH design stage), or we can use the paper as the guideline and implement WITCH according to that (improvise based on more modern architectures)?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">2) As for the input-output, in the project you say that the abstract classes should be implemented so that later actual hardware can be connected to WITCH. What are the concrete
IO systems WITCH should support at the end of GSoC? I was thinking file IO for testing. Other IO types can easily be reduced to file IO. Should IO system run in its own thread/s?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">3) Should the control unit be implemented in software, or virtual hardware?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">4) Should trains of pulses be shown, or sending a number they represent down the line object is enough?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">5) You mentioned that hooking a simulator to the GTKWave should suffice. As the goal of this project is educational, I was thinking (if there is enough time) of making GUI in
eg. QT. I am artistically challenged, but drawing lines and circles should suffice for Dekatrons.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Verdana",sans-serif">Uroš Tešić<o:p></o:p></span></p>
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