Custom Resolution Utility (CRU)

[Nintendo Maniac 64]

Unfortunately I think low resolutions are a limitation of the GPU hardware, not the software.

I'm assuming you're trying to run old games on a CRT at their original intended resolution? You may need to use an old PCI GPU in order to do that - I noticed that 320x240 was possible on an old Radeon 9600 but wasn't possible on a newer Geforce 6800GT nor an integrated Radeon 4200.

(alternatively, you could try running an emulator like DosBox with a CRT shader like those available in RetroArch)


EDIT: Yeah, I just tried on my Trinitron CRT with Radeon 6310 and I just get a black screen if I try to run a game in fullscreen at 320x240 (and for reference, the game in question did indeed support 320x240 due to said game being quite old).