The circuit is relatively simple once the block diagram has been devised. For the serial port, a USB lead meant for interfacing to the RS232 port on a mobile phone was used instead of something more conventional like a MAX232 level shifter. Something like this from ebay would also work. On the ATMEGA8, the whole of PORTB is used for the… Read more »
My 6809 Single Board Computer will need, at least, the following: A CPU Some RAM Some ROM Some I/O devices While there are other options for somewhere to hold a core set of routines*, the traditional method is with a ROM. But a ROM needs to be loaded with code via a programmer. For the ROM a 28C256 is a… Read more »
As a computer user/programmer for the past 20 years, I’ve always had one ambition: to build a real working computer from components. No, not a PC (which anyone can do), but a computer from the ground up. My inspiration comes from various sources, including using a 6502-based education board at college and being amazed at the general simplicity of the… Read more »
So it’s been A LONG time since I wrote here. This will probably not make sense as it’s been ages since I played about with the tank project…. The tank project was fun while it lasted. The final state was: Turret rotated – this was done using another stepper driver chip. HTML/JavaScript interface kind of worked Including touch! I carted… Read more »
Intro A few years ago I bought a “bifferboard“. This amazing little computer is about the size of a box of matches, and has the computing power of, well, about a Pentium 100. But it’s good enough to run a headless Linux environment. After I bought my bifferboard I was impressed with it, but couldn’t really come up with anything… Read more »