Running DOS on Behringer's DDX3216 with a DIY x86-BIOS from Scratch
Summary
Detailed, first-person account of building and testing a DIY x86 BIOS to run DOS on Behringer DDX3216 hardware. It covers hardware specs, BIOS reset vector, real-mode memory map, IVT/BDA initialization, UART control, LCD font rendering, CF-card interfacing, and the journey from initial boot attempts to a stable FreeDOS boot in QEMU and on the device. The article includes extensive code snippets and notes on testing, troubleshooting, and AI-assisted research.