It’s Autumn again and I am revisiting my Project X65. My list of to-do tasks is endless and growing still 🙂 During the summer I have received a couple (2) of emails with comments: by Eric from France and by… Continue Reading
In the previous post I have mentioned that I am working on a port of the 32-bit Forth interpreter OF816 to my X65-SBC, an 8/16-bit retro computer that I am building. The software runs on the X65-SBC in the 65C816… Continue Reading
I am working on a port of the 32-bit FORTH interpreter OF816 for my X65-SBC computer with the 65C816 CPU. The OF816 was created by mgcaret and is available on github. I made a fork of the OF816 project and added a new branch for my work: x65-sbc. The… Continue Reading
Symptoms: Running Fedora 38 and 39 with kernels 6.7.7 on AMD Ryzen 5 with AMD GPU RX570 (Sapphire Radeon PULSE ITX RX 570 4GD5, 4GB GDDR5) sometimes results in a blank screen (no video signal, monitor going to sleep mode)… Continue Reading
Modern microcontrollers and microprocessors have built-in facilities for external debuggers to read/write registers, set breakpoints and generally fully control the CPU. This is one of the main usecases of the standard JTAG interface. The 6502 and 65816 CPUs were created… Continue Reading
In the last 2 months I have re-done my X65 double-decker computer into a Single Board Computer (SBC). The single-board version fixes some of the electrical problems I had on the first version and it has way better signal integrity… Continue Reading
In X65 the assembled CPU is either the 8-bit W65C02S or 16-bit W65C816S. The W65C816S is (partially) compatible with W65C02S. This page summarizes the differences from the low-level hardware point of view and in the case that the 65C816 is… Continue Reading
This document discusses the FM sound synthesis in the Commander X16 and in my x65 computer. Sound in Commander X16 Sound in Commander X16 is generated by two sources that are mixed together: 1) by the Programmable Sound Generator… Continue Reading
SNES Controllers typically look like this: SNES controller is a cheap and easy way how to add a joystick interface to a DIY project. One controller can be cheaply had from aliexpress or similar for around 2 USD. The controller… Continue Reading
The Open-X65 GIT repository is now public: https://github.com/jsyk/x65 Note: this is not a release! The project is very much a work-in-progress. You have been warned 😉