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” …
Minimalist Europe Card Bus (MECB) – MC6809 CPU Card (Part 2 – Testing)
This post follows-on from my previous post, where I presented and assembled my first prototype PCB for a 6809 CPU card, for the MECB bus. The first part concluded following …
Minimalist Europe Card Bus (MECB ) – MC6809 (or HD6309) CPU Card
This post follows on from my earlier Minimalist Europe Card Bus posts and videos. For MECB, to date I’ve designed and built a Backplane, a Prototype card, and a TMS9929A …
EPROM Programmer Compatibility with Adapter for 27C400/800/160/322 16bit EPROMs
Our EPROM Programmer Adapter was initially designed for use with the hugely popular TL866 series programmer. Initially, for the original TL866A and TL866CS models. But then also verified as fully …
Minimalist Europe Card Bus (MECB) – TMS9929A / TMS9928A VDP RGBS Video Card
Earlier, I posted an article and video on my TMS9929A Video Display Processor (VDP) rediscovery. This included designing an alternative Retro VRAM solution, which I then implemented as a breadboard …
More AliExpress Re-Marked Chips – Follow Up! (6809 / 6309 CPUs)
This is a quick Follow-Up to my recent post and video on my AliExpress Re-Marked Chips Frustration! You can find this here: More AliExpress Re-marked Chips Frustration Since then, I …
More AliExpress Re-marked Chips Frustration
Join me as I describe my frustration with AliExpress sourced, incorrectly re-marked / re-labelled, IC parts. This seems to be an ongoing issue, particularly with the retro chips keenly sourced …