New blog post: Remote diagnosing a PET 2001 video fault from one photograph.
blog.tynemouthsoftware.co.uk/2026/02/diag...
Includes a look at how the PET video system works with redrawn schematics.
It also turns out to be a surprisingly early PET 2001.

In 1980, Intel released the 8087 floating-point chip, making math much faster. I'm reverse-engineering this chip, 46 years later. Most of its instructions are implemented in microcode, but some are implemented in hardware. Let's look at the circuitry that decodes instructions and decides what to do.

MusicSharp is an #opensource, cross-platform #TUI music player that I developed using C#. A fully standalone application (no #dotnet runtime required), it supports MP3, FLAC, WAV, & internet radio streams!

There’s still more work to be done, so feel free to contribute!

github.com/markjamesm/M...

New Ancient DOS Games episode uploaded and ready to watch! youtu.be/ADZKPcsbOX0

Do you like SimCity 2000? So do we! I'm pleased to announce that the tenth major release of sc2kfix is available with a whole host of new features and bugfixes, including FluidSynth MIDI output, SCURK functionality on Windows 11, preliminary modding support, and much more: github.com/sc2kfix/sc2k...

I’ve been developing an #emulator for the MOS 6502 and ran into a hardware bug that occurs when a page boundary is crossed during the jump indirect instruction.

Check out my article on the bug & how you can handle it when emulating!

markjames.dev/blog/6502-ju...

#retrocomputing #emulation

Hosting a website on a disposable vape bogdanthegeek.github.io/blog/project...

Several months ago, I became interested in emulation, and it led to me developing Chippy, a CHIP-8 emulator written in C#.

Check out the source code on GitHub:

github.com/markjamesm/C...

#emulation #softwaredevelopment #programming #chip-8 #chip8