qwertypi - a Handheld Raspberry Pi QWERTY Computer

When the first Raspberry Pi 1 Model B was released in 2012, I was fully immersed in the Zipit Z2 community and I had the idea to create my own handheld qwerty Linux computer with the Pi. Back then I didn’t really have the knowledge or skills to follow through with such a project and so it was pushed into the “some day” list. In late 2015, the Raspberry Pi Foundation released the tiny Pi Zero and subsequent Pi Zero W which sparked my interest in building a handheld again. Over that past few months I’ve been working on the first revision of my “qwertypi” handheld computer based on a Raspberry Pi Zero W. The project (more of an experiment) is well under way and I’m already working on a revision 2 pcb to fix my mistakes and change some things around.

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Posted by mozzwald on Fri, 1 Dec 2017     |     0 comments
tags: raspberrypi

Atari 400 8-Bit SIO2Zipit

Back in the 80’s, my first computer was an Atari 8 Bit. I used it a lot until we got our Austin Computer Systems 386 PC. The Atari taught me a little BASIC and a lot of game play. I still have our original Atari 400 which I pull out on occasion to play some cartridge games but I don’t have a very large collection of them. A couple friends last year started a retro gaming event at a local pizza/pub, Peoria Pizza Works, which I also took part in. The Atari 400 was a nice addition to the lineup of vintage systems and the only Atari 8 Bit Home Computer. This year I wanted to have more games available so I did some research and got a Zipit Z2 to emulate a floppy drive over the Atari SIO bus.

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Posted by mozzwald on Wed, 18 Jan 2017     |     0 comments
tags: atari, a8b, 8bit, retro gaming

Zipit Z2 Breakout v2 (mini)

It’s been a year and a half since I came out with the first Z2 Breakout Board. They’ve all found new homes and hopefully some neat projects. I’ve considered making a new board since they all sold out but there isn’t really a Zipit market anymore. I think the buzz may have finally wore off although you can still find Zipits on eBay occasionally and hinv still has some for sale. Finally, I found the time to make a new board that is smaller and a better fit for the Zipit. The new board measures 75.11mm x 16.69mm which makes it sit much closer to the Zipit but extends further from side to side. There is a USB Host port (w/5V boost regulator), MicroUSB device port (charging input), 1.27mm breakout header for all 36 pins and special snap off sub-boards (if desired).

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Posted by mozzwald on Wed, 17 Aug 2016     |     2 comments
tags: zipit, smt, oshpark

Boot the Zipit Z2 from a USB drive

In June, I posted about the “bleeding edge” version of openwrt-zipit and a new u-boot. There was just a brief mention that USB host support was built into it and I never got around to testing it until yesterday. It is pretty easy to setup and requires a USB host cable or my breakout board. The following should get you going.

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Posted by mozzwald on Thu, 4 Aug 2016     |     0 comments
tags: zipit, openwrt, u-boot

iPhone Battery Charger / Tester Breakout and HDQ Gas Gauge Stats

Troubleshooting iPhone problems can be a daunting task sometimes considering how complicated they are. It’s easy to overlook the simple things and on occasion you may replace parts that don’t need replacing. Batteries are no exception. I have seen technicians often replace batteries when they may not necessarily need to be or ignore the fact that they could be the cause of the issue at hand. To remedy this I designed a basic iPhone battery charging breakout board system. The system can charge a battery, has the option for expansion to support newer/other batteries and breaks out the battery status pins which can be read from a microcontroller or some other means. It consists of 6 battery connector boards (iPhone 4, 4S, 5, 5S/C, 6, 6+) and a main charging board.

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Posted by mozzwald on Mon, 1 Aug 2016     |     15 comments
tags: repairs, smt, lipo, battery, iphone, apple

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