sentences:  The chips have various trapping exceptions, such as data read (or write) to the user specified address, and 2 break-points simultaneously.Section 9
  
  The external bus system indicates its bus status using 3 status pins, which provide three bits to signal such conditions as first instruction fetch after branch, continuous instruction fetch, TLB data access, single data access, and sequential data access.Section 6.1, p. 114
  
  These software and hardware debugging functions were also built into the V80.However, the V80 did not have an in-circuit emulator, possibly because the presence of such software as real-time UNIX RX-UX 832 and real-time I‑TRON RX616 rendered such a function unnecessary.