Oleg Endo @EndoOleg

Senior Hardware/Software Engineer • I like power-on 16-Bit

 Kawasaki, Japan
Joined June 2020
  • Tweets 1,168
  • Following 239
  • Followers 76
146 Photos and videos
Replying to @TheLexTimes
“This is implementation, where is innovation?!” — will never forget this piece of “wisdom” for the rest of my life
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Because Twitter is full of photos of this today — let me add one more 😁
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Ah, the joys of audio circuit debugging. When output A of the amp-chip is muted and I turn OFF my soldering iron, I can hear ghost speak and use the iron as an antenna, somehow coupled through the AC outlet. Muting output B doesn’t do that though🤕
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Oleg Endo retweeted
libretro @libretro
Feb 22
Probably one of the biggest milestones in our project's history yet - the next frontier! Introducing the RetroArch Open Hardware Project! libretro.com/index.php/intro…
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And we all thought the Game Gear mini was too small... 😁
ruka @ruka_riker
Feb 19
Visual Memory Console完成〜 ヽ(´▽｀)/ バッテリーのケーブル切断する時火花が散ってビビったけどなんとか無事にできて一安心^^
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When you know things you shouldn't care about... Here: CPU core running code from SPI flash straight w/o cache, at max. speed like a continuous byte stream. However, any jump instruction resets the instruction fetch logic and causes a predictable delay — undocumented of course🤓
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Redone again, properly. Phew -- that took a while! At least signal integrity is not an issue anymore with that.
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Oleg Endo retweeted
Stefan DK3SB @thasti
Feb 7
DVD Drive Laser Scanning Microscope for imaging Integrated Circuits and other tiny things! I finally took some time to write up something on this pre-pandemic electronics project. Here's the full story: loetlabor-jena.de/doku.php?i…
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The noisy Mega Drive audio output has been annoying me for a while. Instead of bypassing the original circuits with strap-on boards, I wanted to see what's happening on the original board and whether it can be improved a bit. So I’ve been trying out all kinds of weird things ….
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… then luckily I found a copy of the PCB layout, which helps a lot. There are some questionable layout choices, which results in pickup of audible digital switching noise. I think it’s pushing the 2-layer design quite a bit. Probably it wouldn't be done like that today.🤓
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Inserting some π-filters and adding more bypass capacitors can clean up the supply rails to some extent, but it will not necessarily result in an effective improvement in the final audio output.
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The PSG audio is routed through digital sections on the board and picks up noise. Lifting the VDP pins AVS, AGS, PSG and rerouting with air wires seems to reduce the noise, but it’s still audible. Maybe it’s the of lack a GND plane under VDP or even the chip layout itself? 🤔
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The most annoying thing is the 50/60 Hz frame buzz and its harmonics, which seems to be on the whole board and picked up by the audio circuits. I doubt that strap-on boards can improve that either. Perhaps there’s no easy fix after all.😞 Maybe I'll try something else later...
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Something's in the making .... OSP + Carbon Ink board surface finish can be a good option sometimes. But can only enjoy its beauty before it gets assembled🤓
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Been playing Xeno Crisis on the Mega Drive and I'm hooked. The atmosphere this game creates and gets across is just amazing. The soundtrack just pushes all my buttons. But combined with the visuals:🤯 Looking forward to the next thing from @BitmapBureau and Savaged Regime!
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This is what happens when you hide the remote/controller
Tauriq Moosa
 @tauriqmoosa
Jan 23
Imagine coming home to find your Playstation 5 like this, thanks to your children (posted in Facebook Playstation group.)
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I really wonder what chip they could be using on one of those boards in the the new Warrior 64. Won't sleep all night long again, what a brainer 🤡
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Been working on a HW design that reminds me of the Sega Saturn. Convoluted systems are difficult to use. Often a result of sociopolitical reasons to keep a project afloat. Some say "the Saturn architecture was ahead of its time" — it's better not to know the truth behind it🤫😅
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It looks like Rust support is going to be added to GCC in the near future! gcc.gnu.org/pipermail/gcc/20…
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