cg3 tweakability info?

Hi, winter holidays left me with too much time at my hands and I'm currently trying out some more arcane (or is that "sick"?) stuff with my Sun workstations. According to the Sun Framebuffer FAQ, the TGX/TGX+ framebuffer is quite universally programmable - some OBP Forth magic allows you to select one of several possible dot clock frequencies, adjust front porch/sync/back porch widths in multiples of pixel duration and so on. (Before anyone asks, this is all just idle experimental proof-of-concept stuff and not intended to work with any off-the-shelf software. If all goes extremely well, it might turn into a sort of SPARC-based videogame console somewhere in time, as I'm looking for TV rate RGB output.) As I don't have a TGX/TGX+ in any of my easily accessible machines, I'd like to know just how "versatile" other framebuffers (mainly the cg3 built into the SPARCclassic) are in this respect. I've already extracted some of the corresponding FCode(attributes and words from /iommu/sbus/cgthree) but it doesn't give me much of an idea where to start yet. Has anybody been involved with that stuff far enough to tell me - or just give me some pointers towards figuring out - which lever does what? Btw, I do have a datasheet of the RAMDAC but could not find any useable information on the LSI L1A4946 chip which obviously, amongst other things, has to generate the video timing. If necessary, I'd even consider replacing the video clock crystal - SPARCclassics are abundant enough here. Thanks in Advance, Arno -- Psssst! Schon vom neuen GMX MultiMessenger geh?rt? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger?did=10