tag:blogger.com,1999:blog-6993165553021868648.post541648886849262875..comments2024-03-27T05:39:24.505-04:00Comments on Nerdly Pleasures: Analogue Nt Mini : Browsing the Core Store Pt 2, AV and Future PredictionsGreat Hierophanthttp://www.blogger.com/profile/04409413307024477304noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-6993165553021868648.post-8589527972255280492018-01-26T13:53:37.505-05:002018-01-26T13:53:37.505-05:00Kevtris' comment regarding differences between...Kevtris' comment regarding differences between posted images: "Probably slight edge rate differences and amplitude differences. The ntm's edge rate is going to be a lot higher than the original system's. It depends too on how the monitor/TV reacts to them. A capture card is possibly going to be more sensitive to edge rates vs. something else like a CRT due to how its decoder works (i.e. it is probably going to be a digital decoder and flat ADC system vs. the analog decoding hardware you'll find on a CRT)."<br /><br />Source: http://atariage.com/forums/topic/242970-fpga-based-videogame-system/page-190#entry3908662<br /><br />And: "There's more variation between the different "official" hardware revs than the ntm's output IMO in those pictures. Remember there's no One True Palette™ for NES, and anyone that tells you there is, is lying :-) The video I generate uses the exact same timing as the real chip does, with the same voltage levels. The only real difference I could see is my quality is a bit higher over all (edge rate, noise floor). So it's pretty much as good as it can ever get. There's some unit to unit differences in PPU outputs, and it can vary some over the 7 PPU revisions as well. <br /> <br />I don't have the resources to test this, but it'd be interesting to see a typical PTV distribution for say the G rev PPUs. (PTV = process, temperature, voltage). You'd have to characterize 10 to 20 PPUs and then vary the 5V supply probably 200mv either way to account for NES to NES variations in the power supply, and then vary temperature of them from say 0C to 40C or so. All of these things will affect the video output so making a "true" recreation is literally impossible, since pretty much everyones' NES experience will be slightly different. Throw in CRT differences and we arrive at the huge mess of palettes we have today."<br /><br />Source: http://atariage.com/forums/topic/242970-fpga-based-videogame-system/?p=3908707Anonymousnoreply@blogger.com