A not-so-much-PowerBook, apparently! I guess the firewire ports on the Pismo were designed for external storage more than anything. It was worth a shot though. Very curious to know if it works on your TiBook.
how bout a firewire cardbus?
PowerBook G3 Series: PC Card - Can the PowerBook G3 Series computer use PC cards?https://web.archive.org/web/19991117154325/http://til.info.apple.com/techinfo.nsf/artnum/n28512
https://web.archive.org/web/20021005202405/http://www.swann.com.au/products/firewire/cardbus/cardbus.htm#features
https://web.archive.org/web/20070312013337/https://www.ratocsystems.com/english/products/CBFW2.html
I was thinking about this as well, but had no idea if such a thing existed. Will have to see if I can find one - something tells me they may be difficult to find!