The PCSX-Redux project is a collection of tools, research, hardware design, and libraries aiming at development and reverse engineering on the PlayStation 1. The core product itself, PCSX-Redux, is yet another fork of the Playstation emulator, PCSX.
The "transfer direction" needs to always be 1 in the general case, to ensure DREQ to properly toggle on FIFO status, and set to 2 for VRAM uploads, and VRAM uploads only.
The "transfer direction" needs to always be 1 in the general case, to ensure DREQ to properly toggle on FIFO status, and set to 2 for VRAM uploads, and VRAM uploads only.