A few nights ago, Justin mentioned in chat that he'd gotten a 5V pixel string from Ray Wu that uses a "9813" chip. It seems that they are 8 bit, but the data format is probably not the same as the 2801. The Chinese data sheet for the P9816 (9/18 channel version) is in the ACL wiki and I found reference to it on the seedstudio wiki. I haven't had a chance to see if the P9813 data is readily available. If someone finds the P9813 data sheet, please post a link to it and I'll add it to the wiki. The P9816 version is interesting as it has has 9 outputs (3x RGB) with a select pin, so you can have two banks of 9 LEDs. I hope to get some of these pixels to play around with and maybe confirm the protocol so it can be added to the various pixel controllers available through ACL.