jaeblog published a new build: I like perfboard, especially the ones with plated trough holes. But I also like SMD components, and more and more fun IC’s are not available in DIP. So a while ago I designed some perfboard with 1.27mm pitch, making some SMD parts like SOIC stuff easy to prototype on it, […]
Steve at Big Mess o’ Wires writes: I finished building my 7400 computer, and posted some demo videos here Via the forum.
Steve at Big Mess o’ Wires posted an update on his Custom 4-Bit CPU: Enough with the vague design talk – here’s the circuit schematic for the Nibbler 4-bit CPU! Click the image to zoom in to a full size view. For simplicity, this version omits some details like bypass capacitors, clock generation, reset circuitry, etc. The […]
Steve at Big Mess o’ Wires writes: I know the Open 7400 Contest is long past, but I wanted to call out a new 7400-based custom CPU I’m building. It’s a 4 bit CPU called “Nibbler”, and more info is on my web site here My goals are to keep the chip count to an absolute […]
Back in the 80s when very few TVs had remotes, let alone automatic shutdown timer, Victor decided to build exactly that for his grandfathers TV. After a set interval an LED turns on indicating that the timer has expired, if a button isn’t pressed within a few seconds the TV is turned off. My grandfather […]
Andre Fachat has written a post on his 6502.org blog detailing his DIY 6502 computer build. “I have built a DIY 6502 computer, which is mostly TTL logic only except for 65xx chips and ROMs, but the most TTL-ish part is the blitter: A block transfer engine that DMAs memory area from one location to […]
UPS package finally corralled, and will be delivered tomorrow. A 74HCT245 will complete a long-delayed final revision of a certain secret prototype. We prepared for tomorrows workshop video on serial port interfacing. We arranged a giveaway for a coming week, and perhaps the first sponsor of the 2012 Open 7400 Competition. Today we continued contacting […]
Today we renewed websites, including 7400contest.com which is coming up again soon. We patched an SPI speed error in the Bus Pirate binary access mode. We had to cancel the company credit cards because 7 unexpected charges to Blizzard (World of Warcraft) and 4 to iTunes showed up today. In the process of checking the […]
Reminder to all those interested in entering their projects into our Open 7400 Logic Competition: Entries must be received by October 21, 2011, 6AM GMT. You only have 24 hours left to send your entry in. Entering Entries can be posted on in our forum, on your personal blog, or even a handy how-to site like Instructables. When you’re […]
Reminder to all those interested in entering their projects into our Open 7400 Logic Competition: You only have two days left to send your entry in. Entering Entries can be posted on in our forum, on your personal blog, or even a handy how-to site like Instructables. When you’re ready, please submit a link to […]
Stephen added his entry in the Open 7400 Logic competition, he made a LCD backpack that uses the SPI interface. Using two 74LS595 serial to parallel shift registers connected in series, he successfully sends data to the 16×2 LCD and adjusts the backlight brightness, by sending 2 bytes over the SPI. The first byte to be sent is displayed on the LCD, and […]
YourITronics is the latest sponsor of the Open 7400 Competition. Prizes include a CP2103 serial to USB adapter with GPIO, TMP275 Digital Temperature Sensor and MPL115A2 pressure sensor breakout. Get your entry in and this and other cool hardware can be yours.