/vr/ - Retro Games

>>10469184
You can make a shitty game pretty easily for the PS2. You can ignore a lot of the hardware or use it suboptimally. The game will look terrible, but work.

To actually maximise the potential of the hardware you have to juggle a lot of concerns in parallel.

>>9789145
>>9787886
The PS2 (before the late-model Slim) used the PS1 CPU as its I/O processor. When you played a PS2 game the PS1 CPU would process things like network data, USB data, controller data, etc. When you played a PS1 game the main game code would run natively on this I/O processor since it's literally just a PS1 CPU.

As far as I'm aware it's physically impossible to run PS1 games from the HDD because the CPU that is used to run the PS1 games is the same CPU that controls the HDD when in PS2 mode. Even if you somehow managed to get access to the HDD within the PS1 sandbox there wouldn't be enough overhead to run the game and the HDD I/O at the same time.

Part of the reason the PS2 struggles to utilize its full 100mbit ethernet speed is because the PS1 CPU is slow.