Three Rings for the Z80

Over the past few years I’ve implemented a number of interfaces for Z80 peripherals based on the principal of the interrupt driven ring buffer. Each implementation of a ring exhibits its own peculiarities, based on the specific hardware. But essentially I have but one ring to bring them all and in the darkness bind them. […]

Yet Another Z180 (YAZ180 v2)

Testing on the YAZ180 v1 , shown below, is now complete. I don’t want to use it for further driver and platform development, because the PLCC socket for the 256kB Flash is becoming worn-out. It will continue to operate as an augmented Nascom Basic machine, with an integrated Intel HEX loader (HexLoadr) supporting direct loaded assembler or […]

Yet Another Z180 Project (YAZ180)

I’m thinking about a new project, something a little unusual but still with a rich history of information upon which to base the build. On Tindie, I found the RC2014 project which is a build of a Z80 platform but based on some modern components. That got me thinking. My next project must be a Z80 […]

Goldilocks Analogue – Wrap Up

This is the final item on the Goldilocks Analogue as a design and production exercise. Thank you for pledging on the Kickstarter Project page. Closed on November 19th 2015, with 124% funding. Now that the Kickstarter Pledges have been shipped, the Goldilocks Analogue is available on Tindie. I’ve been updating this post with the pre-production and […]

XBee Walkie Talkie

I’m building an advanced Arduino clone based on the AVR ATmega1284p MCU with some special features including a 12 bit DAC MCP4822, headphone amplifier, 2x SPI Memory (SRAM, EEPROM), and a SD Card. There are many real world applications for analogue outputs, but because the Arduino platform doesn’t have integrated DAC capability there are very […]

Implementing NASA EEFS on AVR ATmega

I am building a variant of the Arduino platform which will have an analogue output capability in the form of a dual channel DAC, called Goldilocks Analogue. The DAC can be used to generate variable DC voltage levels that might be used as part of a PID control system, and it can also generate AC […]

Goldilocks Analogue – Testing 3

Summary I’m still working (slowly) on a new development for my ATmega1284p platform, called Goldilocks. My initial design for the Goldilocks Analogue was flawed in several ways, so I revised the design and produced a new prototype. Following up on the initial testing matched against the Stanford Analog Shield, I’m now testing against the Open Music […]