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<a class="text-link" target="_blank" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16">9 Comments</a>
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- powered by
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<a class="text-link" href="https://utteranc.es/" target="_blank">utteranc.es</a>
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<a class="text-link" href="https://github.com/cbreezier" target="_blank"><strong>cbreezier</strong></a>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-826249951" target="_blank">on Apr 24, 2021</a>
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<p dir="auto">This was a great write-up - I found that it
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provided a good level of detail while leaving enough of the
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implementation details for me to figure out.</p>
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<p dir="auto">Two things that were a little unclear to me, both in the <code class="notranslate">DXYN</code> instruction:</p>
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<li>While drawing the sprite, I wasn't sure whether I should be actually modifying <code class="notranslate">I</code> or just reading from successive memory locations. I ended up <em>not</em> modifying it, which seemed to work fine.</li>
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<li>The written explanation didn't say anything about setting the <code class="notranslate">VF</code> flag - I had to find that out from the pseudocode section which I had initially tried to avoid.</li>
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<p dir="auto">My attempt (seems to be working, sans sound) is in Rust: <a href="https://github.com/cbreezier/rchip8" target="_top" rel="noopener noreferrer">https://github.com/cbreezier/rchip8</a></p>
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<a class="text-link" href="https://github.com/tobiasvl" target="_blank"><strong>tobiasvl</strong></a>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-912114772" target="_blank">on Sep 2, 2021</a>
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<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/cbreezier/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/cbreezier" target="_top" rel="noopener noreferrer">@cbreezier</a> Hey, thanks for the feedback!</p>
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<ol dir="auto">
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<li>Thanks, I've attempted to clarify this. You're correct, <code class="notranslate">I</code> should not be modified (and neither should <code class="notranslate">VX</code> and <code class="notranslate">VY</code>, for that matter).</li>
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<li>Hmm, the written explanation does have a bullet point about setting <code class="notranslate">VF</code>,
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though? It says "If the current pixel in the sprite row is on and the
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pixel at coordinates X,Y on the screen is also on, turn off the pixel
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and set <code class="notranslate">VF</code> to 1". Let me know if anything is unclear about this, or if you were talking about some other part of the tutorial.</li>
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<p dir="auto">Again, thanks for the feedback, and I'm glad you found it useful!</p>
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<a class="avatar" href="https://github.com/DasStone" target="_blank" tabindex="-1">
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<a class="text-link" href="https://github.com/DasStone" target="_blank"><strong>DasStone</strong></a>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-1063939210" target="_blank">on Mar 10, 2022</a>
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<p dir="auto">Thanks for writing this great article! I’m sure it helped many people get into the topic of emulators, as it did with me.</p>
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<p dir="auto">But there is one thing I’m still not sure about (it has to do with <code class="notranslate">FX0A</code>
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Instruction). It says that the instruction “blocks” execution. Does
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this mean that the timers should stop decrementing as well or do they
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continue at their normal rate of <code class="notranslate">60Hz</code>
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(I’ve scanned the Internet for any mention of this, but I haven’t found a
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clear, unambiguous answer. But it seems like that the timers should
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continue)?</p>
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<p dir="auto">Maybe this is something you find worth clarifying in your article.</p>
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<p dir="auto">Thanks for your time!</p>
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<p dir="auto">Here is my attempt in Rust for anyone interested: <a href="https://github.com/DasStone/chip8emu_rs" target="_top" rel="noopener noreferrer">https://github.com/DasStone/chip8emu_rs</a></p>
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<a class="text-link" href="https://github.com/tobiasvl" target="_blank"><strong>tobiasvl</strong></a>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-1098475208" target="_blank">on Apr 13, 2022</a>
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<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/DasStone/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/DasStone" target="_top" rel="noopener noreferrer">@DasStone</a>
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Thanks for the kind words and the feedback! You're right, this is
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definitely worth clarifying in the blog post. In the meantime, I can
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confirm that yes, you're correct, the timers should continue while the <code class="notranslate">FX0A</code> instruction is blocking for input.</p>
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<p dir="auto">In the CHIP-8 interpreter on the COSMAC VIP, <code class="notranslate">FX0A</code>
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was simply an infinite loop that ran until a key was pressed. The
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timers were decremented in the COSMAC VIP's built-in display interrupt
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routine, which is why they're decremented 60 times per second – the
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display interrupt occurs each frame drawn to the display, which
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refreshes at 60 Hz. You can read more about it here: <a href="https://laurencescotford.com/chip-8-on-the-cosmac-vip-interrupts/" rel="noopener noreferrer" target="_top">https://laurencescotford.com/chip-8-on-the-cosmac-vip-interrupts/</a></p>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-1132356459" target="_blank">on May 19, 2022</a>
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<p dir="auto">Hi <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/tobiasvl/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/tobiasvl" target="_top" rel="noopener noreferrer">@tobiasvl</a>, thanks for posting this excellent guide. I referenced it many times while writing my own interpreter.</p>
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<p dir="auto">I have a question regarding one of your statements:</p>
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<blockquote>
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<p dir="auto">However, the actual drawing of the sprite should not wrap.
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If a sprite is drawn near the edge of the screen, it should be clipped,
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and not wrap. The sprite should be partly drawn near the edge, and the
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other part should not reappear on the opposite side of the screen.</p>
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</blockquote>
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<p dir="auto">But <a href="http://devernay.free.fr/hacks/chip8/C8TECH10.HTM#Dxyn" rel="noopener noreferrer" target="_top">this reference</a> says:</p>
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<blockquote>
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<p dir="auto">If the sprite is positioned so part of it is outside the
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coordinates of the display, it wraps around to the opposite side of the
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screen.</p>
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</blockquote>
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<p dir="auto">For example, paddles in Pong seem to wrap in other
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interpreters I tried (e.g. Octo IDE), but based on your instructions,
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they shouldn't. Am I missing something here?</p>
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<p dir="auto">Edit: Just found out Octo IDE has an option for wrapping/clipping sprites. I think I'll make it configurable too.</p>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-1133746903" target="_blank">on May 21, 2022</a>
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<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/jakubito/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/jakubito" target="_top" rel="noopener noreferrer">@jakubito</a>
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Thanks, interesting! I can confirm that my statement is correct –
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sprites shouldn't partially wrap in either the original CHIP-8
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interpreter (<a href="https://laurencescotford.com/chip-8-on-the-cosmac-vip-drawing-sprites/" rel="noopener noreferrer" target="_top">source</a>) or in CHIP-48/S-CHIP (<a href="https://github.com/Chromatophore/HP48-Superchip/blob/master/investigations/quirk_collide.md" target="_top" rel="noopener noreferrer">source</a>).</p>
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<p dir="auto">However! By "Pong", I assume you're referring to David
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Winter's Pong game. It was written for his own DOS interpreter, which
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was based on the CHIP-48 specification. This specification seems to be
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what Cowgod's reference is based on as well. It's possible David Winter
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introduced sprite wrapping himself, and this is the reason for the
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disparity.</p>
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</div></article><article class="timeline-comment">
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<a class="avatar" href="https://github.com/JamesWWalker" target="_blank" tabindex="-1">
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<a class="text-link" href="https://github.com/JamesWWalker" target="_blank"><strong>JamesWWalker</strong></a>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-1193015003" target="_blank">on Jul 22, 2022</a>
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<p dir="auto">Thanks for this helpful post on creating a
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CHIP-8 emulator! I just developed an interest in emulator creation and,
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after a little research, discovered that writing a CHIP-8 emulator
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(/interpreter) is apparently a rite of passage. With the help of this
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guide, I put together a working CHIP-8 emulator in Java that passes the
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BonCoder test, and it only took around 8 hours. I'm planning to try to
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make an NES emulator next. I expect that to be a big step up in
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<a class="text-link" href="https://github.com/jasonnelson618" target="_blank"><strong>jasonnelson618</strong></a>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-1291568542" target="_blank">3 months ago</a>
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<p dir="auto">Hello! Love the article and I've been working on
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my own interpreter, however I noted you said for the IBM logo program
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only the opcodes you mentioned were needed, but there are several
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opcodes starting with "F" in the versions of the IBM logo I can find, so
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I'm quite confused if more opcodes are needed or if I'm messing up
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something. Any clarity would be appreciated! Thanks in advance.</p>
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commented
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<a class="text-link" href="https://github.com/tobiasvl/tobiasvl.github.io/issues/16#issuecomment-1291863321" target="_blank">3 months ago</a>
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<blockquote>
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<p dir="auto">Hello! Love the article and I've been working on my own
|
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interpreter, however I noted you said for the IBM logo program only the
|
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|
opcodes you mentioned were needed, but there are several opcodes
|
|
|
starting with "F" in the versions of the IBM logo I can find, so I'm
|
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|
quite confused if more opcodes are needed or if I'm messing up
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something. Any clarity would be appreciated! Thanks in advance.</p>
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</blockquote>
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<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/jasonnelson618/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/jasonnelson618" target="_top" rel="noopener noreferrer">@jasonnelson618</a>
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Thanks for the kind words! There should be no FXXX opcodes in the IBM
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program. How are you reaching those opcodes? My guess is that you're
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reading the graphics data (for the IBM logo) as code somehow, ie. that
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you have a bug that has caused your Program Counter to point into the
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graphics, attempting to execute it.</p>
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<p dir="auto">If you push your code to GitHub, I could have a look at it
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and see if I spot the bug. Otherwise, good luck bug hunting! Might be a
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good idea to write some debug stuff to the terminal, such as the
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current PC and opcode at each step, so you see what's happening.</p>
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