GateBoy Is A Game Boy Emulated At Gate Level

Old game systems are typically the most popular targets for emulation. With huge communities of fans wanting to recreate the good times of yesteryear, most old systems have all been brought back to life in this manner. However, some simply dive into emulation for the technical challenge, and [Austin Appleby] has done just that with GateBoy.

GateBoy is a project to emulate the Game Boy logic gate by logic gate. It’s a lower level approach that builds upon earlier work [Austin] did on a project called MetroBoy, which we featured previously.

The emulator was created by painstakingly reverse-engineering the logic of the Game Boy. This was done by poring over die shots of the actual DMG-01 CPU silicon. GateBoy emulates most of the chip, though avoids the audio hardware at this stage.

Presently, GateBoy runs at roughly 6-8 frames per second on a modern 4GHz CPU. As it turns out, emulating all those gates and the various clock phases at play in the DMG-01 takes plenty of processing power. However, compilation optimizations do a lot of heavy lifting, so in some regards, GateBoy runs impressively quickly for what it is.

[Austin] still has plenty of work to do before GateBoy is completely operational, and there are some strange quirks of the Game Boy hardware that still need to be figured out. Regardless, it’s a fantastic academic exercise and a noble effort indeed. Meanwhile, you might like to check out the Game Boy emulator that runs just one single game.

Pokemon Time Machine Lets You Really Catch ‘Em All

Since 1996 the Pokemon series of games has moved through eight distinct generations, which roughly parallel the lineage of Nintendo’s handheld gaming systems. While the roster of “pocket monsters” has been updated steadily, players have had the option of bringing captured Pokemon from the older games into the newer releases. But there’s always been a gap in this capability. Due to hardware differences, the Game Boy and Game Boy Color generations of games were physically unable to communicate with the titles released for the Game Boy Advance.

But soon, that may no longer be the case. [Selim] is hard at work on Lanetteā€™s Poke Transporter, a hardware and software solution for bringing Pokemon from the first and second generation games onto the third generation GBA games. Once they’ve been loaded there, players can move the creatures all the way up into the contemporary Pokemon games via official means.

The first Pokemon to make the generational leap.

The project was started in July of 2020, with [Selim] first focusing on the logistical challenges of bringing such early Pokemon into the newer games. Because so much changed between the different generations, there are many sanity checks that need to be made during the transfer. For example, the moves and techniques that the creatures are able to learn isn’t necessarily consistent between these early entries into the series. But after about a year of effort, the software side worked reliably on emulated games, and it was time to start thinking about the hardware.

Ultimately, [Selim] wants to create a physical device into which players can insert their Pokemon cartridges and trigger an automatic transfer. The code is already able to read and write to the cartridges, and has been ported over to Arduino so it doesn’t need a computer to run. A few prototype PCBs have been created, and beyond the inevitable bodges, it seems like they’re functional. There’s still breadboards and jumpers for as far as the eye can see, but this is the first step towards producing a dedicated Pokemon “time machine” that can transport them from the late 1990s to the present day.

With [stacksmashing] recently showing that the Raspberry Pi Pico is fast enough to emulate the Game Boy’s “Link Cable” accessory, and the protocol for trading Pokemon over the wire fairly well understood, we wonder if one day this technique couldn’t be done in real-time between linked handhelds. If you can make two copies of Tetris connect to each other over the Internet, it seems like you’d have enough time to fiddle with a Charizard’s stats.

Thrashed, Damaged NES Controller Gets Brought Back To Life

Electronics might as well be a magical black box to some people. Where some would see a broken NES controller destined for the bin, [Taylor] saw the opportunity for a repair. Thus, the damaged hardware was brought back into useful service.

The controller was bought as part of a job lot, and was heavily damaged when it entered [Taylor]’s ownership. Nintendo built its hardware tough in those days, but the controller had nevertheless been smashed apart, with the case cracked and split and the PCB itself snapped in two.

For someone with basic electronics skills, though, repair was simple. The broken PCB was glued back together with epoxy. The broken traces had solder mask scraped back so that jumper wires could bridge the damaged area and return the circuit to functionality.

From there, it was a simple matter of 3D printing a new case, and the controller was back in service. The case in question was designed by [Alexander Myrman], and has a neat little inset Mario design that’s made visible by paint-filling the inlay.

While it was an easy fix, to the uninitiated in the electronic arts, it might as well be magic. It pays to remember that there are always new people joining the electronics hobby, and projects like these are a great way to learn. It’s also important to note that bringing back old retro hardware is often of great value, as in many cases, they’re not making any more! We see some great restorations around these parts, too. Video after the break.

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Making A Left-Handed NES Controller

The controller for the original Nintendo Entertainment System is a classic, but perhaps not best known for its adherence to good ergonomic principles. Regardless, it can grow awkward to use for long stretches of time. To help alleviate this, [Taylor] whipped up an easy way to convert a NES controller to left-handed operation.

The mod board in question, installed on a NES controller PCB.

The crux of the hack is simple, with the controller’s buttons swapped left-to-right to enable the controller to be flipped upside down. In this orientation, the D-pad is used by the right hand and the action buttons by the left–the opposite of the usual way. Thus, left and right on the D-pad must be switched, as well as A and B, so all the controls are otherwise in a logical layout.

This is achieved through the use of a little mod board of [Taylor]’s own design. The original HD14021BP chip is desoldered from the controller’s PCB, and installed in the mod board instead. The modboard can then be soldered back into the controller, rerouting the traces to swap the buttons. There’s also a version that [Taylor] designed that can flip between right-handed and left-handed operation thanks to some onboard DIP switches.

It’s a tidy hack that could save the thumbs of some dedicated Tetris players. Alternatively, you can always make your own NES controller from scratch. Video after the break.

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A SNES Music Player You Can Control With A Browser

Listening to chiptunes on an emulator or software-based player is fine, but sometimes you just gotta have that real hardware charm. [Kazhuu] is one such enthusiast who feels this way, and set about building a hardware player for SNES chiptunes that can be controlled from a browser.

The build relies on an Arduino Micro to control the SNES Audio Processing Unit (APU), featuring the Nintendo S-SMP as produced by Sony and designed by Ken Kutaragi. Yes, the father of the PlayStation designed the capable wavetable synthesis chip in the Super Nintendo, and it’s that same hardware that [Kazhuu]’s project interfaces with modern hardware.

With the Arduino’s IO lines hooked up to the APU, song data can be piped out to the Arduino over a serial connection to a PC. This can be handled by a Python script, or more intuitively via a browser-based front-end. This uses WebUSB in order to take input from the browser and then send data out over the USB-serial connection to the Arduino.

It’s a neat demonstration of both working with vintage Nintendo sound hardware and how to code modern browser applications to work with embedded systems. If you’re a SEGA kid, though, you might prefer this build instead. Video after the break.

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Nintendo Zapper Reborn As Home Automation Remote

Generally, using a gun to turn your lights off is dangerous and expensive, but for the [DuctTape Mechanic], it’s just how he does things. Video also after the break. To be fair, he uses a salvaged Nintendo Zapper, not a firearm, and replaces the guts with an RF transmitter. We are shocked that he chose a radio model instead of infrared seeing as how he is repurposing a light gun, but our scores in Duck Hunt suggest he made the right choice.

The transmitter comes from a keychain remote, so it all fits neatly inside the Zapper chassis. A couple of wires hijack the stock button and run to the stock trigger, so you keep that authentic feel. The receiver side is a bit trickier. When it senses a button press, it sends a pulse, as you would find in a garage door opener, but to keep a lamp on, there needs to be some latching and so there is an Arduino. The microcontroller keeps a tally and operates a 10 amp relay module, so it is mostly acting as the glue between hardware. All of the mains electrical components sit in a blue plastic box with a receptacle on the front.

We don’t see the Zappers used for their intended purposes much anymore because they rely on old technology, but that doesn’t keep people from repurposing the iconic peripheral.

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Mega Man 4 Free of Charge ROM Hack Pexels Anete Lusina

Mega Man Hack Drops Charge Shot, Adds Classic Style

When it comes to the six original Mega Man games there is a clear dividing line between the first three and the last. Mega Man 4 introduced the charging shot mechanic that allowed players to hold down the fire button in order to power-up a single blast from Mega Man’s arm cannon. The aptly named, “Mega Man 4: Free of Charge” ROM hack by [Peter] seeks to bring cohesion with the first trilogy of Mega Man games by removing the charge shot mechanic completely. To compensate for the change, enemy health bars were also adjusted so that enemies aren’t as bullet-spongy.

The Mega Man 4: Free of Charge download comes as an IPS patch file. There are free utilities out there like Floating IPS that can apply the patch file to a clean dump of a NES cartridge. This ROM hack is playable on original Nintendo Entertainment System hardware via a flashcart device, or it can be played by any common NES emulator like FCEUX or Nestopia.

One of the most annoying parts of Mega Man 4 (minus the difficulty) was the constant whir of the charge shot drowning out the brilliant soundtrack. With a patch like [Peter]’s this is no longer a going concern, and players are able to give their thumbs a bit of a break by not needing to continually hold down fire throughout a run. All welcomed changes aside, it still won’t change the fact that the Japanese TV commercial for the game is cooler than the print ads in the US.

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