DDT

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DDT (Dynamic Debugging Technique) is a family of debuggers with some common characteristics:

  • Most commands are invoked with a single key, plus modifiers.
  • Altmode or Escape is used as a prefix modifier.
  • Arguments are commonly prefixed to the command.

DDT was first implemented at MIT for a PDP-1 computer. It was then implemented for PDP-6, 10, and 11 computers at MIT. It was also widely used at DEC.

A version was written in portable C, and used with the MOS operating system on PDP-11's, various Motorola M68000 Family machines, and AMD 29000 machines.

Implementations

Implementations found on ITS

  • Exec DDT, also known as NTS DDT, for the PDP-6 and 10.
  • Timesharing DDT for the PDP-6 and 10.
  • KLDDT specifically for the KL10.
  • RUG for the PDP-11.
  • URUG, or micro RUG, for the GT40.
  • KLRUG for the KL10 front end.
  • 11DDT for the PDP-11.
  • CARPET remote PDP-11 debugger hosted on a PDP-10.
  • Timesharing DDT for SITS.
  • IMDDT for Imlac PDS-1.