I have decided to post this because I know that several will be interested. I have completed (or at least most importantly) my SoundFont of my Casio CTK-230. If you really like cheap sounds or SNES style sounds, then you're going to love it.
According to a friend of mine he told me that this keyboard could be from the 90s (I do not know this because it was given to me many years ago on my birthday), but judging from the low fidelity sounds, I could bet that it is.
More information and download link in this page.
If you want to download the demo songs of this keyboard, in the link that I left above there is a link of Google Drive under the heading "More Info".
Well, enjoy it!
Note that English is not my native language. Thanks.