My Geeky Hobby

A few years ago, I shared a Z80 “single board computer” design called MGH80… it was meant to be a bit of an “Arduino of the 80s” / “simple Z80 experiment platform”… I finally had a chance to complete the project.

Here is a couple of examples of how people ended up using my EPROM emulator: Let’s start with Torsten, who decided to use the emulator to help with the development on his ZX81.

As always, all source code and design documents are on my github page: EPROM-EMU-NG on GitHub I recently posted an article that shows how people ended up using the emulator, check it out there: EPROM emulator NG use cases.

This article is mainly aimed at my Polish readers, owners of the educational computer CA80, but the i2c bit-banging for Z80+8255A may come useful on other Z80 platforms.

Intro.

In my Commodore 64 Power Supply magic post, I talked about the internal power supply and how not everything that you see when you quickly glance is as obvious as it seems.

Note: At the beginning of this post, I cover some basic power supply stuff, so if you already know a lot skip to the later part where I cover the more interesting 12V DC rail.

I need to test my Commodore 64 but I have no floppy drive, cassette deck or cartridge… This was the dilemma I had one evening after repairing my newly acquired Commodore 64 machine – yes I will write a blog entry about it and link it here later.

Introduction to Hyperflex (HX) API.

Decided it’s time to document some of the work I do, mainly for myself.