It’s always nice to keep a record of changes. For a complete report, you can check the commit log. Alternatively, here’s a simplified list:
2026-06-06
- Extended audio section and added information about CD-ROM XA.
- Added info about texture pages and colour lookup tables.
2025-07-13
- Overall improvements to prepare for a book release.
2021-06-30
- Corrected load delay info (see https://github.com/flipacholas/Architecture-of-consoles/issues/45 and https://github.com/flipacholas/Architecture-of-consoles/issues/48). Thanks u/meancoot, Cat coherence and saveriomiroddi.
2021-06-29
- Corrected data cache info (see https://github.com/flipacholas/Architecture-of-consoles/issues/42). Thanks pnp2084, Jakub Czekanski and Cat coherence.
2021-06-18
- Corrected buses of the main diagram, thanks repeto and Jakub Czekanski.
2021-06-17
- Corrected diagram and system control coprocessor statements, thanks repeto and Nicolas Noble.
- Added more resources to understand the MDEC, thanks Jakub Czekanski.
2021-06-14
General overhaul with lots of changes:
- New sections: I/O and Operating System.
- More diagrams and improved current ones.
- CPU: Added history, co-processors features and delay slots.
- GPU: Added more info about the rasterizer and texture mapping, distorted effects and video out.
- Audio: Corrected SRAM to DRAM, mentioned streaming capabilities.
Thanks dpt, Nicolas Noble and the Emulation Development discord.
2021-02-13
- Improved layout and sources.
2020-04-24
- Improved audio section.
- More anti-piracy and I/O content.
Thanks simias and /u/impiaaa from HackerNews and /r/programming, respectively.
2020-04-19
- Expanded anti-piracy section after finding more info
2020-04-11
- Dedicated more text to the visibility approach
2020-02-28
- Expanded VRAM section
2020-01-27
- Expanded ‘Models’ section
- Added more reasons textures wobble
2019-10-29
- Added some 3d models to fiddle with
2019-10-09
- Improved Scratchpad term
2019-09-17
- Added a quick introduction
2019-08-29
- Better explanations
2019-08-09
- Corrected vague CPU info
2019-08-08
- Ready for publication