Processor Built With Transistor-Transistor Logic

October 30, 2009 by Mike Szczys 26 Comments

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[Donn] wanted know exactly what is going on inside of a processor so naturally he built a CPU out of TTL components. He had previously built a couple of versions of a computer based on the Z80 processor. Using the troubleshooting skills he learned and a second-hand textbook, he set to work using 74LS series chips connected using the wire-wrap method we’re familiar with from other cpu projects.

The finished product runs well at 1.8 megahertz, but he also included a 2 hertz clock and a step clock for debugging. At the slower speeds, the register board (seen at the left in the picture above) lights LEDs and can be used to tell what the CPU is currently working on. Programming is accomplished through either a dumb terminal or a PC running a terminal emulator.

His writeup is from about five years ago but that didn’t prevent us from getting that fuzzy feeling in the geek-center of our brain when we read about it. It is well written and thorough so if you’re into this kind of thing there’s plenty to enjoy.

[Thanks Raleigh]

How To Create TrueType From An Image

October 30, 2009 by Mike Szczys 13 Comments

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[Viacheslav] wanted his virtual terminal to have the look of a DEC VT220. He was unable to find a font set that looked just right so he set out to make his own TrueType font. He managed to find a sample image of the glyphs that the VT220 used as fonts. Using a collection of free software he sliced the image into 256 different parts, resized and converted to one-bit index images, and converted these to vector graphics. This was accomplished with a bit of python, an image tracing program, and font editor called FontForge.

Take some time to dabble with these font tools. With an adequate sample you should be able to reproduce any font set. We won’t achieve anything as sophisticated as the font printed with bacteria, but this will be a start in the right direction.

Ubuntu 9.10 Karmic Koala

October 29, 2009 by Mike Szczys 108 Comments

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Today is the official release of the latest version of Ubuntu, the most popular Linux-based operating system. Someone mentioned that there had been a new release of the Windows OS recently and if you’re thinking of going with that one, we feel you should a least give Ubuntu a try. Now in its 11th official release and codenamed Karmic Koala, this version of Ubuntu continues the traditional six month development cycle by succeeding Jaunty Jackalope which was released in April of this year.

We’ve been running the beta release of Ubuntu Netbook Remix for several weeks now. It cut boot time down to between 5-10 seconds and WiFi is already connected by the time the Desktop loads. Speed isn’t the only new feature, graphics have been redesigned, there is a new app store that serves as a front end for the extensive free software repositories, and the newest kernel and software versions are included.

We’ve been using this open source operating system since its third release, Breezy Badger. We love it for the quality, convenience, and the fact that we can get our fingers into the code and hack around a bit.

Linux IPhone Sync Draws Near

October 29, 2009 by Mike Szczys 11 Comments

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[Emuboy] lets us know about some software advances that will make iPhone and iPod Touch syncing possible under Linux. Apple made big changes to how the iPhone syncs compared to legacy iPods. Locking out all communications other than through iTunes was surely part of their motivation. This has left Linux users out in the cold with shoddy sync capabilities which should be coming to an end. If successful, syncing will be be possible with phones that have not been jailbroken.

One of the biggest hurdles in reverse-engineering the new protocol is the non-standard way in which the devices communicate over USB. The usbmuxd developers have been working to implement communications and now have a Release Candidate for the 1.0.0 version. Along with testing of this package, libgpod is now being updated to play nicely with the new database format and hash of the iPhone.

This isn’t quite at the plug-and-play level of convenience yet but if you’re comfortable working with Linux packages you should be able to get this working and help report any bugs you might find. But if you’re tired of open source playing cat and mouse with Apple you can always switch over to a device based on Android.

Read About Trash-hackers… For Free

October 29, 2009 by Mike Szczys 21 Comments

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[Cory Doctorow] has published a novel about the near future and a couple of hackers who can make anything from the stuff lying around. We like a good sci-fi novel, and have no shortage of recommendations (go read Snow Crash) for those who need them. We’re adding ‘Makers’ to our must read list.

Not only is this book about you, but its release most likely agrees with your life philosophy. You can download this book, right now, for free, legally. This is because it has been release under the creative commons license. Best of all, if you like the book and want to make a donation, you are directed to purchase a book on behalf of a school or other program that has requested a copy but doesn’t have the funds to acquire it themselves.

So, buy the book if you want a physical copy, download it if you prefer that method, but either way we think this is better than stealing the printed word.

Upgraded Atari 1024STf

October 28, 2009 by Mike Szczys 42 Comments

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[Gerritt] wanted to give his crippled Atari 1024 STf a new purpose in life. He cracked it open and set to work filling it with some modern components. The keyboard from the nearly 25-year-old dinosaur doesn’t have all the keys we’re used to, nor did they all work, so he replaced the original with a 101 key model. The internal hardware was replaced with a microATX board, a picoPSU, Bluetooth and WiFi transceivers, a hard drive, and a slot-fed DVD drive. He even rebuilt the original mouse to use the circuitry from an optical mouse.

The final product is a 1.6GHz Pentium Mobile with one gig of ram. Now he has no need to pick up an EEE Keyboard PC when they hit the market.

Xerox Ink Will Print Circuits

October 28, 2009 by Mike Szczys 40 Comments

Xerox has announced a breakthrough in printable circuits. They’ve developed a conductive ink called “silver bullet” that can be printed on many different types of substrate to create circuits. The key part of the new ink is its lower melting point. Plastic film substrate melts at 150 degrees Celsius but the ink is liquid when ten degrees cooler to avoid damaging the film. This begs the question: how do you then solder components to the circuit?

The benefits of printable circuitry are obvious. Aside from cheaper and easier RFID, disposable circuits like greeting cards, and fabric-based electronics, we’re hoping this will facilitate more environmentally friendly PCB fabrication. That really depends on the ink’s production process and the resilience of the resulting circuitry.

[via Gizmodo]