While the Mario "ding" is the most famous, the "coin beep" has evolved alongside technology:
Modern sound design often layers high-frequency "sparkle" sounds with 8-bit, nostalgic sounds to create a more satisfying, high-fidelity experience. video_game_coin_beep_sound_effect
The coin sound effect is inherently satisfying, tapping into human psychology: While the Mario "ding" is the most famous,
The sound was created by playing an octave or fourth interval upward at a fast tempo. video_game_coin_beep_sound_effect
Simple, monotonic beeps were standard due to low bit-depth.