ePSXe
I'm using ePSXe 2.0.5 and mapped the key to SPACE.
Here are my settings if it helps:
Plugin: Pete's OpenGL2 Driver 2.10
Author: Pete Bernert
Card vendor: ATI Technologies Inc.
GFX card: AMD Radeon HD 7700 Series
Resolution/Color:
1440x900 Fullscreen - NO desktop changing
Internal X...