programming A directive used in IBM object code carddecks (and later PTF Tapes) to REPlace fragments of already

assembled or compiled object code prior to link edit.

Recompiling or reassembling the source code to produce a

whole new object module was only possible if the source code

was available, which it rarely was (if you had the object you

were lucky!) It was also quicker to apply incremental changes

with REP cards and they also circumvented the checksums and

card sequence numbers present in the object code.