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Most likely just to provide a lower impedance ground path to the full circuit, plus perhaps shielding, perhaps for regulatory reasons. Belts and braces type of stuff.

C2 and (I think from the schematic) C9 are connected from the respective amplifier output (pins 12 and 15) to ground, and provide some high frequency attenuation, so yes, they do affect the quality of the sound. (In the neutral meaning of the word quality.)

The Gameboy Wideboy development unit gives a hint. This development unit has a dummy piece for the Gameboy, with no CPU, but buttons and an LCD. Those same holes exist there, but have silkscreen marked out. They are intended for capacitors, for some overshoot limiting or so. However, they are not populated even in this dev unit.

Those are test pads for probing the video signals. On older DMG motherboards they are exposed to so you can probe them, but they remain in later revisions as vestigial traces. I would recommend exposing them if anyone for any reason want to probe the video signals.

You may have been looking too long at the schematic compared to a real motherboard.
The round ones are for attaching the copper sticker.

The connection point to the PCB is mechanically fragile. You want to make sure that all solder is molten before you lift it. Your best bet is likely hot air, but be very careful to not damage the LCD or LCD ribbon interconnect.

With love and tender care.

It should be about right, but good luck ever finding a suitable transformer new. You're likely better off designing a power regulator board from scratch.

The LCD board, despite being double sided, does not have through-plated vias. So those are indeed jumpers. On a modern PCB, just replace them with a track going on the bottom, connected on each end to the other side with a via. Note that one of the links (the one with two end on the bottom side) is not an electrical link, but a mechanical placeholder for the LCD ribbon cable.

Prosound. A footprint for an LCD signal inverter for a biversion mod using a 6 pin dual inverter. Arduinoboy. Maybe replace the headphone amplifier with something more modern and less noisy. Maybe a rechargeable LiPo battery, assuming this can be done safely. If you want to get funky, an analog audio filter like http://www.youtube.com/watch?v=9KDI3UbW_3w.

*raises hand*

Should be about right, except maybe the naming of the display data pins, and the CLK? pin, which I believe isn't really a clock pin at all, but a gate signal specifying that there's bus activity.

The sav is not a ROM. It's a save file. It contains save data, and renaming it to .gb makes no sense. You need an LSDj ROM that you put side by side with the .sav, that has the same name but different file extension. So you might lsdj.gb and lsdj.sav. Then you open lsdj.gb in BGB, and it automatically finds lsdj.sav. You need an actual LSDj ROM for this to work.

The first thing to check is which type of GB you're using and whether you've prosounded it. Those are the two main things influencing the noise floor.

http://www.herbertweixelbaum.com/comparison.htm

And of course, a crappy audio interface might add noise as well. Try recording silence from the audio interface with nothing plugged in and see how it sounds. Maybe you actually ought to get a new interface. (Especially relevant for built-in interfaces in laptops.) Yet another thing you may want to try is draw a spectrogram of the audio and look for the frequency of the whine, then use a very narrow eq to take that particular frequency out. This also assumes that the whine is at a fairly constant frequency. Not sure what capabilities Audacity would have doing something like that. I could upload pictures and an audio example of how to do this in Adobe Audition.

Have you checked if it matches a PSX memory card? Just a wild guess.

AT90S2313 is the MCU model number. 0141 is the date code. (YY/WW.)

No. That's a way of categorizing special functions on mapper chips that otherwise behave like a standard MBC5 or similar. For example, Nanoloop One is listed as its own MBC in the MBC list because it's using a special command set for switching between banks. EMS on the other hand behaves like a standard MBC when as far as the switching between banks is concerned, so the standard bank switch code is used when flashing. However, it also allows for multi-ROM functionality, which is then listed as a special power. Funky name, yes.

Teaser time!

If you use IRC, try #gbdev on EFNet.