RISC-V with a ZX-Spectrum-style video adapter on a DE0-CV board

In this article, the author describes the development of a video adapter for the YRV RISC-V processor using the DE0-CV development board. The project began with a monochrome adapter utilizing atomic operations for pixel manipulation. The author subsequently expanded the functionality by adding color support and transforming the device into a full-fledged framebuffer. The final implementation is inspired by the ZX-Spectrum architecture but features modern specifications, including a 640x480 resolution and 12-bit color depth. The article details the technical aspects of implementing graphical output and integration with the YRV processor, offering readers a deep dive into FPGA-based hardware design. It serves as an excellent example of the practical application of RISC-V in hobbyist custom hardware projects.