Some years ago, I wanted to make a Nixie Tube clock from scratch. PCB manufacture was so expensive that I ended up just making the PCBs by hand. I figured I would give the market another look, and dang has custom PCB manufacture become cheap! The best/easiest service that I found was OSH Park. I'd never had PCBs made…
Programmers trying to make crypto run fast often say things like "Why can't the CPU designer just add a 128-bit multiplication instruction?" Sometimes these questions turn into academic papers analyzing the cycle counts that would be obtained from various instruction-set extensions. What's missing from most of these…
We present a simple to use implementation of networking across ultrasonic frequencies, by making use of Gnuradio and a microphone and speakers. This allows you to use TCP/IP , UDP across an audio link.
If you look closely at the datasheet for a Z-80 chip, you'll notice the data pins are in a random-looking order. The address pins (A) are ni...
I've been working for a while on a program that automatically generates analog electronic circuits using evolutionary algorithms. It's still very much a work in progress, but I've used it to generate some useful circuits. Current workings of the program is as follows: Programmer decides a goal function, possible…
(Update 2014-10-30: Due to some interest in this project, I added schematics for the GALs)
I bought Avnet's $49 Spartan 3A development board but it was discontinued not long afterward - right about the time when I decided I needed a few dozen more. I've since done some extensive research (thanks, Google!) to find a comparable thrifty thrill.
How many problem domains require wrapping signed integers or non-wrapping unsigned integers? Can the current undefined case be replaced with a trap and everything else be left intact?
blog about networking, cameras, old gear, and xmpp
If you haven't read my Nintendo 3DS intro blog post first, I'd suggest it as it's a fun short read that gives some backstory of my interest...
Nobody doubts that the C64 was the greatest selling single computer model of all time, it even made it into the Guinness Book of World Records, but nobody quite knows how many it really was: Most sources say 17 million, others say 22 or even 30 million. With a high degree of confidence, I can now…
This topic was discussed in greater detail in Episode 184 of to The Amp Hour. This article is more about the personal feelings that have accompanied this (ongo
What does a recycled (heavily used) go kart tire, an action-packed three-phase servo drive and a gyro/accelerometer have in common?
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The latest version of the Intel manual has a couple of new instructions for non-volatile storage, like SSDs . What's that about?
This led to some general discussion that this particular device really is in a class of devices, now called the "killers", which need to be made.
Samuel Clay is a grad student in the schools of design and of engineering at Harvard. He founded NewsBlur , a personal RSS news reader, and Turn Touch , beautiful control for the smart home.
A very warm welcome to my most ambitious project to date. In this project I’m going to attempt to design and build a sprite-based graphics accelerator that will function as a co-processor to an MCU. Using cheap off-the-shelf components I’m hoping to achieve a level of gaming performance that compares well to popular…
