Cool articles :) I got into emulation in the late 90s and eventually wrote both an NES and Genesis emulator. I always appreciated how cleanly organized Sega’s systems were, at least superficially considering the memory and register layouts.

You should take a look at Sega’s arcade systems, which were very cool, especially the Model 1, 2, and 3. Supermodel, an open source Model 3 emulator I co-wrote, and MAME have good emulation of Model 3 and 2, respectively, these days. Absolutely fascinating rendering architecture. It was early modern 3D when things were still weird and custom, before the industry standardized on OpenGL and Direct3D.

Hideki Sato made a fatal mistake that killed the Dreamcast. The use of an obfuscated and strange disc format should have protected the system from piracy, but they did not think it through. The discs were barely larger than CDs (700 MiB to 1000 GiB) which made it perfunctory to excise videos and music to fit the game on a traditional CD. Once that was possible, the only problem was to boot the system from a pirated CD, which was shockingly easy.

While a Playstation needed a special chip to run pirated discs, a vanilla Dreamcast could play any pirated CD you could throw at it. It was Game Over for Dreamcast 18 months after it was released, pirated discs had destroyed the market, and Hideki Sato was responsible.

Source: https://fabiensanglard.net/dreamcast_hacking/