DDT [DEC Debugging Tape] © 1964 DEC [Digital Equipment Corp.].
DDT allowed users to find errors in the program while the program was in use.
The DEC Debugging Tape (DDT) was based on FLIT, an earlier debugging program written by MIT professor Jack Dennis and translated in 1964 for the PDP-1 by a group of students at MIT, including Alan Kotok.
It is the first program for the PDP-1 created at MIT and donated to Digital Equipment Corporation (DEC).
By: Alan Kotok
Software's cassette.