PicoGraph is a Pico 2 mounted on a PicoMEM 1.4, running custom firmware that hosts a USB DisplayLink adapter via TinyUSB and emulates PC graphics adapters on the ISA bus. It started out as tooling to snoop and visualize I/O and memory accesses for my FPGA projects, and turned into the first Pico-based ISA video card.
CL5429: Cirrus Logic CL-GD5429-compatible emulation based on PCem.VGA: IBM VGA-compatible emulation based on PCem.EGA: IBM EGA-compatible emulation based on PCem.HERCULES: Hercules/MDA text and graphics based on PCem.MDA: Strict MDA support.REGISTER_VIEW: passive VGA/MCGA register, POST, and palette display.SAMPLE: minimal example for I/O traps, memory traps, and write-only snoops.
This project has a heavily modified version of the libdlo DisplayLink library - first for TinyUSB support a couple of years ago, and later for run-length encoding. USB 2.0 DisplayLink adapters (DL-1x0 and DL-1x5) are supported.
The software portions of this repository as a collection are licensed under the GNU GPL version 2. Some files are individually dual-licensed under BSD or MIT licenses – see the license in the file headers for details.
Experimental firmware for FreddyV’s PicoMEM hardware, inspired by Ian Polpo’s PicoGUS software architecture.