F. K. Williamson, Solartron Electronic Group Ltd.,

Farnbrough, Hampshire, England

D-BUG is an aid used in debugging PDP-8 programs by

facilitating communication with the program being run.

Communication between operator and program is via the

ASR-33 Teletype. D-BUG is similar to DECs Program

ODT II (DEC -08-COAl-PB); however, it uses the DEC

Floating Point Interpreter (Digital 8-5-S).

Two modes of operation are possible, fixed and floating

point. D-BUG features include register examination and

modification, control transfer, octal dumping, and instruction

trap-outs to D-BUG control. Registers containing floating

point numbers may also be examined, and break-traps can

be inserted in floating point programs.