The schematics for the XTFB are postscript files on A3 paper.

 xtfb.ps                 Hierarchical sheet
 brdled.ps             
 clock.ps               
 flex.ps                
 output1a.ps           
 output1b.ps             
 output2a.ps             
 output2b.ps           
 output3a.ps              
 output3b.ps            
 p3conn.ps              
 rc1.ps                   
 rc2.ps               
 rc3.ps                 
 rc4.ps                
 receiver.ps            
 term1.ps               
 term2.ps                
 term3.ps             
 term4.ps               
 vmeconn.ps