Toward the end of the Apple II's official support, Apple Computer Inc. had planned a revision of the Apple IIGS personal computer. Codenamed "Mark Twain", the model never reached production. Through a series of coincidences, Joe Kohn of the GravenStein Apple User Group came into possession of a rare prototype Mark Twain. He presented this public demonstration of the computer on Saturday, June 15, 1996, at 10 AM PDT at the Trinity Community Church, 1675 Grand Avenue, San Rafael, CA.
This video was shot by an unknown member of the GSAUG and donated to Joe Kohn, who had Marin Filmworks convert it to DVD in 2009. Upon Joe's passing in 2010, the DVD, along with the rest of Joe's Apple II estate, was bequeathed to Tony Diaz, who converted it to a computer file and provided it to Ewen Wannop, who gave it to Ken Gagne, who uploaded it to Vimeo. Additional thanks to Will Nelken and Ray MacAnally, formerly of GSAUG, and Donald Jordan.
For more details about the Mark Twain, read Joe's article in Volume 3, Issue 1 of Shareware Solutions II at wannop.info/SSII/SSII_Index.html