Bitmaster HDD chips

Port-Dreamcast,

On Bitmaster's website there is a schematic for the HDD controller board 
including part numbers.  Does anybody know where to get these ICs?  I've 
been to Jameco, Mouser, and Digikey, none of which stock them.  If these 
chips are no longer manufactured does anybody know what I could 
substitute them with.  Has anbody used this board, if so how well did it 
work.

Thanks,
Michael