Latest quakeforge has a software appearance mode. The lighting is still a bit smooth, but it gives some of the artifacting that we like. The artifacts are noticable in darker areas if you zoom into a screenshot

Way back there was a thread called "make darkplaces look like crap" or something like that. But the word 'darkplaces' is ignored in insideqc forum search, even 'find all words'. Anyway, DP has additional forgotten settings that give the appearance of reduced colors at the expense of high contrast.
