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Dambusters is based on the WW II operation that was nicknamed that. As you can imagine, you pilot a plane and have to bomb and shoot as much as possible.
The hex addresses below apply to US set 1.
Present at the beginning of ROM file db5a.pr5 is this message. Formatting has been applied for readability.
COPYRIGHT (C) 1981 SOUTH WEST RESEARCH LTD. ALL RIGHTS RESERVED. *** BEWARE !! THERE BE DRAGONS *** THIS GAME IS AVAILABLE UNDER LICENCE FROM THE MANUFACTURER : -SOUTH WEST RESEARCH LTD. 2-12 MILL LANE, BEDMINSTER, BRISTOL, ENGLAND. TEL: BRISTOL 6321821
Of course, there are no dragons in the ROM.
Loaded at $30E4 (US sets) or $30A2 (UK set) in memory is this list of slightly mysterious people:
LES GRAHAM LLOYD F. GUS WEST STEVE MAY STONE F.J. PARKER C. PHIL HOLE BRIAN WEST