Altirra 3.2 Test 27 with simulated bi-cubic filtering, bloom and scanlines on the left vs. Retro Arch 1.7.5 with "crt-royale-ntsc-320px-composite.cgp" CG shader preset on the right on a 4K screen. Much as I love Altirra and respect its accuracy and attention to detail, the pic on the right still looks more like the real thing, thanks to the 14 pass, complex shader. Certain effects, such as shadowmask, are nearly impossible to accurately simulate without complex pixel shaders. I know emulators such as SNES 9x support retro arch shaders, would be nice if Altirra did too one day, this would make it the uncontested king of Atari emulation.