None of my versions appear to accept the code , I find that slightly odd as V1 especially appears to be 'all there' as you'd expect it to be. I will obtain another copy from elsewhere.
By "all there" I simply mean it retains the keypad code entry and also does not run on a 6128!
Actually ignore that!
Tested my disk version (without keypad entry as supplied) and it works:
Tested V2 of the tape version on a 464 and that worked too. The only issue I have noted is some of the rooms, particularly if you look at the Cartography Room cheat page, try the two I have changed/highlighted in red in this pic for ease of location:
Results in this 'room' being shown, its playable too although any exit results in a life loss or as happened once (in the slightly 'not right' release tape) a machine reset. The real tape/disk images result in a life loss however. The combi pic explains:
By rights the lower red block should be 'drinking water' and the upper right red block part of 'secret passage' if memory serves correctly.
I tried what I suspect was the 'original' versions of JSW2 via emulated Amstrad. I suspected it was reasonably intact as the game froze on V1 completely when trying to run on a 6128 so I was forced to use 464 mode, both V1 and V2 were loaded via emulated tape, complete with working keypad/code entry page. I did not bother with disk versions.
I was unable to invoke the cheat despite several efforts on both the title screen, during play and then actually while being in the Cartography Room itself (not necessary I know) , I also tried with the COPY key held down and with and without shift too, just incase.
I do think it may well be present in V1 at least still, however its activation I think there is a little bit more to it. I can recall reading something quite a while back about it I'll have to look into it a bit more.
One thing is that on the Amstrad, the Cartography room, as well as being a fun little screen in the game, was actually used by Derrick and I as a debug mode. We have a cheat code, that went: “EMMRAIDNAPRRRTT” (which is actually the initials to the words in a nursery rhyme), followed by either the ESC key or perhaps another key or two.
Its not Escape that quits to the title screen! , will retest with various other keys although the fact he says "another key or two" is going to make it more difficult. Praise for snapshots for quick reloading!
As an aside there is talk of memory constraints, although it would potentially only save a 'few bytes' both the AMS and ZX versions with keypad intact have a blank page with a 'Press enter to continue' line, rather than like say other games with keypad protection (ZX at least) that immediately take you to the entry page. All I'm saying here is a few precious bytes *could* of been saved by not having this slightly un-needed page/pause before code entry ?
The only sensible next test I can think of is to try it on my real CPC464 although I'd need to sort out the tape image (tzx/cdt to mp3/wav or something) and use that rather than use my original but re-release tape, mind you that would be quicker. This way I can rule out key mapping concerns, as its not ESC it may be CLR but that does not work either.