Chip U39 – 8 bit samples Chip U38 and U39 combined, 16 bit samples. The lower picture has got a much lower noise floor and it sounds much cleaner. If you look at these two pictures, you can see the difference immediately. I wrote a small program which combines the contents of these two chips to form 16 bit samples and loaded the result into my wave editor. U38 -Frequency Spectrum U39 -Frequency Spectrum U40 -Frequency Spectrumĭo you see it? There is a relationship between the two chips U38 and U39. For U39 and U40, we see regular frequency spectrums of sample data. Obviously, for chip U38 this is mostly noise, but not everywhere. This can be tested by looking at the frequency spectrum of all three chips. If this chip contains the LSB of another chip, to which chip does this data belong? It furthermore cleared up that this chip does not contain a nibble for each of the other two chips to create 12 bit samples. This proved that this is not „random“ data but actually raw sample data. What do we see here? We see eight least significant bits of a sample. The end of the chip data raised my attention as it looked like sample data: Chip U38 data I took a closer look at chip U38, the chips that only produced random noise so far. But I had three chips only, where are my remaining 512k of data that I would need? Maybe the samples are 12 bit? Chip U38 is special I guessed that the K4 somehow creates 16 bit samples by combining the contents of the chips together. To my surprise, chips U39 and U40 sounded just fine now! A little bit of 8 bit noise, but nothing unexpected. I changed the import format and loaded them again. This can be seen by adjacent bytes constantly rising or falling, as below: I looked at the data in a hex editor and was surprised to find content that much more looked like 8 bit samples rather than 16 bit samples. What I also noticed is, that the former two chips sounded a bit distorted, had a lot of noise and the pitch seemed to be pretty high. While I had no issues with chips U39 and U40, chip U38 (the rightmost one in the picture above) sounded like garbage.
I imported the raw data as 16 bit and listened. As the K4 claims to be a 16 bit sampler, it was expected that it needs more storage for the samples.Īfter having dumped all of them, which was very easy due to them being socketed this time, I loaded them into my wave editor to take a first look. In contrast to the K1, the K4 has three Wave ROMs in total.įrom left to right: Kawai K4 Wave ROM chips U40, U39, U38 I dumped the firmware just to verify that the content on the chip matches the firmware image that I already had on disk, which it does. The first thing I did is to dump the contents of the Firmware EPROM and the Wave ROMs.
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