The "cs 1.6 ps2" is a fascinating time capsule because it is a direct clone of PC version 1.6. It is a hybrid.

You're likely referring to Counter-Strike 1.6 on the PlayStation 2 (PS2) console.

Headshot. The screen bloomed red. Then black. Then the PS2’s memory card icon spun in the corner—corrupting, saving, corrupting.

The Myth of Counter-Strike 1.6 on PS2: Mods, Ports, and Reality