Love it or hate it, you can’t deny that Java has a pretty impressive track record in terms of supported platforms. Available on everything from flip phones to DVD players, not to mention computers, Oracle once famously claimed that Java runs on three billion devices. An estimate that, in truth, is probably on the low side at this point. Especially when [Michael Kohn] keeps figuring out how to run it on increasingly esoteric devices.
[Michael] writes in to tell us that he’s added support for the PlayStation 2 console to Java Grinder, his software for taking Java code and turning it into a native binary for a variety of unexpected platforms. His previous conquests have included the TRS-80 and Atari 2600, so by comparison the PS2 is an almost tame addition to the list.
Let’s be honest, you probably don’t have any desire to run a Java program on Sony’s nearly two decade old game system. But that’s OK. The documentation [Michael] has written up is fascinating anyway, covering specifics of the PS2’s rather unique hardware and quirks he ran into when developing on an emulator and deploying on real hardware. Even if you’ll never put the findings to practical use, it’s absolutely worth a read.
In the video after the break you can see the demo [Michael] came up with booting on a real PS2 to prove the software works. To really put his mark on it, he mentions he wrote and performed the demo’s songs and even drew some of the artwork on paper and scanned it into his computer.
We’ve previously covered his work getting Java running on the Sega Genesis, as well as the venerable 6502 CPU. Oh, and one time he encoded data onto a pancake. We like this guy’s style.
Continue reading “Even the PlayStation 2 Can’t Escape Java”
When [Im-pro] wants a display, he wants it to spin. So he built a persistence of vision (POV) display capable of showing a 12-bit color image of 131 x 131 pixels at 16 frames per second. You can see a video about the project below, but don’t worry, you can view it on your normal monitor.
The project starts with a Java-based screen capture on a PC. Data goes to the display wirelessly to an ESP8266. However, the actual display drive is done by an FPGA that drives the motor, reads a hall effect index sensor, and lights the LEDs.
Continue reading “FPGA Persistently Rick Rolls You”
These days, conversations about Java tend to center around Oracle and Google fighting it out in court. But back in 1996, Sun was the keeper of Java and promoted it heavily. They even released a diskless workstation that only runs Java applets. The Sun JavaStation was affectionately called the “Mr. Coffee” and [Cameron Gray] wants to show you how it worked and what’s inside of it.
A single screw frees the innards from the small case. Inside looks like a dense PC from the era, although the parts inside are a far cry from a typical PC. The CPU was a 110 MHz microSPARC II soldered directly to the motherboard. The four RAM slots could take up to 64 megabytes of PC RAM.
Continue reading “The Forgotten Workstation: Sun JavaStation”
Unless you’ve completely unplugged from the news, you probably are aware that the long-running feud between Oracle and Google had a new court decision this week. An appeal court found that Google’s excuse of fair use wasn’t acceptable and that they did infringe on Oracle’s copyrights to Java. Oracle has asked for about $9 billion in damages, although the actual amount is yet to be decided. In addition, it is pretty likely Google will take it up to the Supreme Court before any actual judgment is levied.
The news is aimed at normal people, so it is pretty glossy about what exactly happened. We set out to try to make sense of it all. We found a pretty good article from [Michaela Barry] about what the courts previously found. There were three main parts:
- There were 37 API (Application Programming Interface) declarations taken verbatim from Java. This would be like a C header file if you aren’t familiar with Java.
- Google decompiled 8 security files and used them.
- The rangeCheck function — 9 lines of Java code — were exactly the same in Oracle’s Java and Android.
Continue reading “Oracle v Google could Chill Software Development”
There are many projects that call out for a custom language parser. If you need something standard, you can probably lift the code from someplace on the Internet. If you need something custom, you might consider reading [Federico Tomassetti’s] tutorial on using ANTLR to build a complete parser-based system. [Frederico] also expanded on this material for his book, but there’s still plenty to pick up from the eight blog posts.
His language, Sandy, is complex enough to be a good example, but not too complex to understand. In addition to the posts, you can find the code on GitHub.
Continue reading “Language Parsing with ANTLR”
Java Grinder is a tool that compiles Java programs to run on platforms like microcontrollers and consoles, by outputting native assembly code and using APIs to work with custom hardware like bespoke graphics and sound chips. Amongst other hardware, Java Grinder supports the Commodore 64, which uses a variant of the 6502 CPU. [Michael Kohn] realized the Atari 2600 shares this processor, and figured he’d get started on making Java Grinder work with the Atari by expanding on the C64 work done by [Joe Davisson]. Together, they brought Java to the Atari 2600 and made a game along the way.
According to [Michael], parts of the project were easy, as some Java routines compile down into as little as 1 or 2 instructions on the 6502. Other parts were harder, like dealing with the graphics subsystem, and modifying Java Grinder to output 8-bit bytecode to fit into the Atari’s tiny 4K ROM limit. Even with this tweak, they still couldn’t fit in a game and title screen. In the end they relied on bank switching to get the job done. [Joe]’s game is pretty solid fare for the Atari 2600 — blocky graphics and bleepy sounds — and they’ve uploaded it to the page so you can try it yourself in an emulator.
At the end of the day, porting Java code to a system with 128 bytes of RAM probably isn’t going to be particularly useful. However, as a coding exercise and learning experience, there’s a lot of value here in terms of building your skills as a coder. Other such experiments have shown us Java running on other unexpected devices, like the Sega Genesis or the MSP430. Video after the break.
Continue reading “Atari Now Runs Java, Thankfully Doesn’t Require Constant Updates”
So, wether you’ve blown your house’s breakers while cranking up the power on your latest project or a storm has brought low the local power grid, what do you do if you desperately need coffee with no electricity to power your coffee maker? Make like [austiwawa]: crack it open and bust out the tea lights.
Removing the bottom of the coffee maker is simply done, exposing the resistance heating element. Improvising a jig to hold the coffee maker over an arrangement of five tea lights, the candle flames slowly do the work of heating the element to set the maker in motion.
It’s a solution for after the apocalypse… as long as you can find tea lights, coffee plus a grinder, and for some reason don’t want to use the quick and efficient method of brewing over an actual fire (though kitchen hearths are a rarity these days). Now we kind of want to see this adapted for all kinds of other heat sources. Reflected sunlight anyone?
Continue reading “Brew a Cup of Coffee Without Electricity!”