Hexadecimal 4×4 Matrix Keypad – Ultimate Cherry MX Version
In a couple of recent posts / videos, I covered the beginnings of my Hexadecimal Keypad design journey. In these earlier posts, here and here, I presented the history of …
Minimalist Europe Card Bus (MECB) – Motorola I/O Card + Sound
With my first Minimalist Europe Card Bus CPU Card finally completed, to my satisfaction. Next up, is my Motorola based I/O Card, which will finally enable a complete modular 6809 …
Hexadecimal 4×4 Matrix Keypad – Tactile Switch Version (Part 2)
This post / video follows on from Part 1 of the Tactile Switch version of my Hex Keypad project, where I assembled my first Keypad. For Part 2, it’s now …
Minimalist Europe Card Bus (MECB) – 6809 / 6809E CPU Card – v2.2 Update!
This post follows on from my earlier Minimalist Europe Card Bus posts and videos. The 6809 CPU Card has been a long journey. First v1.0 then v2.0, and now v2.2 …
Hexadecimal 4×4 Matrix Keypad – Tactile Switch Version (Part 1)
Like many, I have a number of projects that have previously stalled, for various reasons. One of those previously stalled projects is my Hexadecimal Keypad journey. This project was initiated …
Pixel Pump – Manual Pick & Place Tool – My Review
I’ve just received my Pixel Pump from Robins Tools. The Pixel Pump is an open source vacuum tool for manual SMT assembly. Pixel Pump originally featured on CrowdSupply, for delivery …
Retro CPU Interrupts – Driver Options
I’m now finalising the design of my first I/O Card for the Minimalist Europe Card Bus (MECB). I need a driver circuit for a single connection to an Interrupt input …
A Retro Motorola MC6850 ACIA Baud Rate Generator
I’m currently working on the design of my first I/O Card for the Minimalist Europe Card Bus. As mentioned in my previous post / video, my intention is to first …
Minimalist Europe Card Bus (MECB) – 6809 / 6809E CPU Card v2.x
This post / video follows on from my earlier Minimalist Europe Card Bus posts and videos. My original (version 1.x) MC6809 CPU Card required an original internal clock 6809 (or …
Optimising our Retro CPU Reset Design
While considering my next CPU card design, I decided to first take a look at the Reset circuit design. My first MECB CPU card faithfully used the same “old school” …