First time here. Im the author of the chipsounds blog. Coincidence indeed lol. Thanks for the upD7801 datasheet!!! That is REALLY welcome. (too bad i didnt have it a week ago lol).
I'm not sure ANYONE had it, other than Takeda Toshida and partners maybe, scanned in PDF form until yesterday.
I like tracking down and digitizing datasheets. Ingo Sangmeister at http://www.ic-ts-histo.de
is a really great guy and has the largest private collection of data books I've ever seen, even more than Al Kossow of http://www.bitsavers.org
. He's been very helpful over the past few years when websites like DatasheetArchive.com don't have what you need. You just have to be patient and not flood him with requests. The Software Preservation Society (http://www.softpres.org
) has also required his help in obtaining obscure floppy-drive-related datasheets. (I wonder what they are, maybe MESS will need them too at some point)
the XML format for chip data is not meant as an "end all" compressed format. I mostly use it to manually create/test lists of register writes and to make snapshot of discreet sound blurps like Special Effects and the likes. Common set of C++ tools to play with it etc...
I think R. Belmont's just concerned about whether he needs to try to support another chiptunes format in Audio Overload. http://en.wikipedia.org/wiki/Audio_Overload
I can get a datasheet for the uPD23128AC if you want.