I’m still searching for a 8bit screen and found this topic : http://www.raspberrypi.org/phpBB3/viewtopic.php?t=33679&p=398256
It seems possible to modify SSD1289 screens to use them in 8bit.
Has one of you tried this?
Do you know if it is working with all screen, such as this one? http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=370668505157
If this is not working, do you know any other screen usable in 8bit or with SPI with a size around 3in? I know it is technically possible to drive a 16bit screen with some 75HC595, but I want to avoid this.