NOAC or Original NES???

Includes Atari 2600, Nintendo 8-bit, Sega Master System, MSX and more!

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SgtBowhack
Posts: 831
Joined: Wed Dec 08, 2004 5:16 am
Location: Chicago, USA

Post by SgtBowhack »

its true that the noac a actual hardware designed to play famicom/nes games but for actually playing the games emulators still play the game more accuratley than MOST clones on the market not onley do they play some games funkey but the timeing is off also its (not quite correct) hardware for emulators the ones i speak of have most mappers emulated in includeing pirate mappers although this argument is pointless all I was saying way its imperfect
Mapper emulation is, by definition, less accurate. Timing is in fact better on the NOAC than most emulators, as the emulators do not even attempt to be what is called "cycle accurate" (because that's too slow). The NOACs don't need to do any work to be cycle accurate. Your statement is flawed on so many levels.
- There are VERY few games that "play funky" due to the NOAC. There may be other poor parts on the board, but that is the fault of the manufacturer, not the NOAC.
- Timing isn't controlled by the NOAC, but by the clock circuit. If the timing is off, replace the clock circuit.
- Most mappers may be emulated, but many are also not emulated quite properly, and many are emulated by implementing explanations gleaned by reverse engineering. This is a very poor method.

gannon: I was indeed mistaken. My pirate Genesis is the Game Joy. Thanks for pointing that out.

FastMHz: OK, that I cannot really deny. Though when dealing with making a portable, this is a moot point, as most speakers that will fit in a portable will not be limited in quality by the NOAC's output.

NES Man: That is such a hack... I'm not even gonna get started on it. Let's just say that the NES shouldn't do stereo. It's not normal, and it doesn't really improve the gaming experience.
Epicenter
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Joined: Fri Dec 03, 2004 7:07 pm
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Post by Epicenter »

SgtBowhack wrote: overclocking - There should still be a crystal somewhere. Changing that crystal = overclocking or underclocking. Pretty much the same as any other video game system out there.
This won't work in any Famicom on a Chip / NES on a Chip based pirate system. The clock fed from the ~21 MHz crystal into the chip drives the clockrate for the integrated audio and video hardware, as well as the CPU, so raising those clocks will throw everything out of whack. It will also destroy audio pitch, tempo, and raise video hsync/vsync beyond managable rates that could be used on a television (50, 60 Hz vertical may become something wacky like 72, 75, 80 ..)

So, you won't be able to overclock these units without opening the FOAC/NOAC with some microscopic tools and changing its inner workings. Not very feasible. :)
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