Alto/Mesa Debugger 6.0 of 28-Oct-80 14:1815-Nov-84 14:17~~~~~~~~~~ SIGNAL ERROR>Display StackNo symbols for L: 77464B, PC: 1303B (in RetrieveGV, G: 143060B)  >nNo symbols for L: 165720B, PC: 1134B (in RetrieveGV, G: 143060B)  >nNo symbols for L: 41004B, PC: 1640B (in LilyAccess, G: 144410B)  >nNo symbols for L: 37424B, PC: 5111B (in LilyCommands, G: 144414B)  >nNo symbols for L: 100404B, PC: 7462B (in LilyCommands, G: 144414B)  >nNo symbols for L: 37004B, PC: 3674B (in LilyCommands, G: 144414B)  >nNo symbols for L: 40004B, PC: 1360B (in GlassImpl, G: 143744B)  >>Kill session [Confirm] 