In a recent podcast episode, Vinh Nguyen delves into the architecture of the original PlayStation, offering a detailed technical breakdown of the console that launched the 3D gaming era. The episode examines the system's MIPS-based central processor, highlighting its RISC origins and custom coprocessors such as the Geometry Transformation Engine (GTE). A distinctive feature of the CPU was its use of a "scratchpad" instead of a traditional data cache, which influenced performance characteristics.
The podcast also covers the GPU's rendering approach, explaining how an ordering table managed visibility and why the lack of perspective correction led to the iconic texture warping and visual distortions seen in many PS1 games. Beyond graphics, the episode explores the Sound Processing Unit (SPU), the CD-ROM subsystem's role in anti-piracy and region locking, and the overall software environment. Nguyen explains how Sony balanced affordability with performance to create a developer-friendly platform that defined early 3D gaming.