@OneBitOnePixel

Researching vintage LCD Games. Creating games and stuff for retro devices. https://xitter.cf/t.co/XgJBjzMwxU

github.com/azya52
Joined September 2023
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194Media
Edla Game became the 50th LCD game to be emulated in BrickEmuPy. I'm not planning to stop yet, so follow along!
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Received two packages today: a Pocket Pikachu Color and a Digivice Revival from @ElMadre6, and a D-Tector from @OKDecc. I’ll be working on these devices soon.
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Puyolin (ぷよりん) LCD game has been dumped and emulated. It runs on a Holtek HT1190 4-bit microcontroller.
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UC-2000の2KB内のメモリーで動く独自のBASICを作ってグラフィック表示試してみた。 #UC2000 #SEIKO #Python
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I'm currently working on an Epson RC-20 emulator. The watch has two processors: a 4-bit one and an 8-bit Z84. I'll only emulate the Z84 program execution mode, as I won't decap the 4bit MCU of these rare watches to dump mask ROM. The video shows a Chrome T-Rex demake I once wrote
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This is what the game looks like on a real watch: youtube.com/watch?v=gIUXOaXo…

T-Rex game on Epson RC-20 (1984)

I finally got the Epson RC-20 computer watch that were released in ...

youtube.com
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D-Power Digivice EU 1.01 has finally been dumped and emulated. Many thanks to @OKDecc for sending me the device to dump. He actually sent me two of them, because my first etching attempt wasn't successful.
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Tamagotchi Mini 2017 has now been dumped and emulated. Most likely, the dump contains errors, so in the future I will try to dump another copy to verify this.
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Die photo of the microcontroller from a 2017 Tamagotchi Mini. The ROM image isn't good enough for automatic bit recognition, but since only ~12 kB of the 256 kB ROM is actually used, I think I can extract it entirely by hand.
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Nintendo Mini Classics Soccer (1998/2004) has now been dumped and emulated. As far as I know, this is the first Mini Classics game to be dumped. I hope I come across more games from this series. github.com/azya52/BrickEmuPy
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Photo materials are available on Archive.org: archive.org/details/nintendo…
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Using an 8-bit microcontroller with 32 KB of ROM for a game like this is definitely overkill.
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I've decapsulated another Nintendo Mini Classics game, this time Soccer from 2004. I managed to capture an image of the ROM, so it's only a matter of time before it's dumped and emulated. commons.wikimedia.org/wiki/F…
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Interestingly, there is no information on the die itself to identify the microcontroller, but fortunately, the manufacturer kindly indicated the part number on the PCB: Syntek STK55C324.
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An unknown microcontroller from the Littlest Pet Shop virtual pet (McDonald's Happy Meal, 2007). commons.wikimedia.org/wiki/F…
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Bandai SD Gundam Gaiden II (1985) has now been dumped and emulated. Many thanks to @MilanSK46676000 for the ROM dump and reference photos used for vectorization. LCD game donated by MikeG.
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Apollo Prince & Princess has now been dumped and emulated. This virtual pet is powered by a Sunplus SPLB20 microcontroller. Thanks to @ksenia1923396 for providing a copy for dumping.
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Today, trying to decode a ROM, this one is from the Digimon Analyzer. I've marked one out of a dozen ROM banks. I don't know silicon very well, so not quite sure where the data is actually being read from.
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I recorded a video of the IC decapsulation process. The hot air gun nozzle is visible in the top-left corner, with the temperature set to ~150°C. This method works great for small chips. On larger dies, some compound often remains in the center, which I remove by boiling in rosin
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Now Digimon can communicate with each other too.
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I also implemented serial communication in BrickEmuPy and used it in the Tamagotchi V3 emulation:
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