This is a later beta of Diablo for the PS1 than the one that has already leaked. The things to note in this build are the “Bent” cheat menu, the different version name, and the need to hold a button to enable the cheat menu. I no longer have access to this build, so the amount of video I have is quite limited. Note that this is playing on an emulator, the PS3’s PS1 emulator to be exact (which I don’t like to do, but the PS1 has some dreadful video output without some more equipment).
When people think Microsoft and the Xbox, many still think of Halo first and foremost. Debug executables have been available online for quite a while, and yet few seem to actually use them, typical I guess for most beta leaks. This first video shows off the wireframe mode, along with a few other debugging functions, running on an Xbox.