The mini one was officially the PS One as the full name of the system. The official abbreviation for the original grey model was the PS or PS1, depending on whether or not Sony had started developing the PS2. Then they just started adding Slim to distinguish the small models and Xbox proudly took up the duty of naming consoles things that are confusing and don’t make any sense.
Ah, yeah for some reason I always called the older boxy gray version the PSX, and the slimmer white one the PS1.
The mini one was officially the PS One as the full name of the system. The official abbreviation for the original grey model was the PS or PS1, depending on whether or not Sony had started developing the PS2. Then they just started adding Slim to distinguish the small models and Xbox proudly took up the duty of naming consoles things that are confusing and don’t make any sense.