Crystals for half clock mod (Page 1 of 2)

You can use a 2mhz crystal and the gameboy will run almost half as slow.

But the problem is that your songs will sound out of tune. Since the gameboy uses the clock speed to determine the pitch.

For example. A C4 note at half speed will be a C3
The problem with a 2 MHz clock is that a C4 will be just a little lower then a C3 that way.

Which could be interesting tho
And you can fine tune instruments in lsdj, but that's a lot of workaround.

So in short. Yes a 2mhz crystal will work, but your gameboy will be out of tune.

You can use that crystal if you want. They will work and LSDj will run, but apparently the frequency is slightly too low. This means that the notes played will be slightly too low in pitch. However, there's a way around this. You can change the frequency table in LSDj to make it work correctly with essentially any crystal oscillator speed.

Explanation of the oscillator frequency used in the Gameboy: It is using frequency that is a power of 2, so the frequency is (nominally) 2^22 Hz, or 4*1024*1024 Hz. This can also be called MiHz, or MibiHertz. -> http://en.wikipedia.org/wiki/Binary_prefix
Why Nintendo did this, nobody knows for sure.

Of interest maybe (tuning table etc): http://little-scale.blogspot.com.au/200 … e-boy.html

Exactly right. You've only got a fixed range of frequencies. However, a straight half frequency means the pitch is one octave lower, which is never a problem. The problem is when you have an oddball ratio, so the pitch is almost, but not quite, one semitone off an nothing works together.

To dogtag, how many crystals you need. I think I have 1 or 2 spares.

We overlapped!

Because of what ashimoke said, what I actually need is that easy_CLK from kitsch, because I want to be able to switch crystals with the DMG turned on. But thank you very much for the offer!

Watch out, ashimoke pointed that if you do it that way the GB will crash.