Mort

This isn't really a mod, but just the original excellent @Ross DX layout added with the @johnparker007 hacked v1.0 ROM.
You can read all about the development of the hack here:
Basically this hack puts back in the emptier from the original v0.4 £15 release ROM.
The trick is to play for barcode wins from nudges, moving the reels into let 'em spin configuration.
Barcode wins are free, and do not update the compensators.
The best barcodes to take are 3-2-1 and 3-1-2.
If you take 3-2-1 you can hold down all hold buttons (1,2,3) to get all the way to a £15 JP repeater.
Enjoy.
Massive thanks here to @Ross for the DX that makes it all worthwhile and @johnparker007 for the genius.

The existing @dad and also @Multi Retro Man DX layouts are the best versions of Donkey Kong from a graphics perspective.
We had been using those DXs to test a hack to the earliest Donkey Kong ROM over on the ROM hacking forum thread posted below.
The purpose of the discussion was to try and hack the earliest ROM we have to patch back in the original skill nudge cheat. 
Massive kudos to all of @johnparker007 efforts with the hack. The video below from @Chopaholic will explain things much better than trying to understand the entire ROM hacking thread.
 
The issue we had with both of the latest DXs is that they still have cash values for the £5 game.
I doubt these DXs will be improved again but I wanted to also have a version of the DX in my playable set which does have the correct cash values.
Here is a mod I have done for an older DX done by Andy T (a DX done some 21 years ago!!)
I am sharing this mod here for anyone who would enjoy it as another option to play but please remember graphically the latest DXs are much better.
Thanks to @dad @Multi Retro Man and Andy T for all the hard work originally. This type of mod is simple to do in comparison to a full DX.
Game Information
Note: The patched/hacked ROMs do not require you to hold the Cancel button down to activate Skill Nudges
Donkey_Kong_(Maygay)_[Dx08_10jp].gam - This game file runs the SA7-103 (v1.1) ROM as normal, with no hacks.
Donkey_Kong_(Maygay)_[Dx08_Patch1_10jp].gam - This game file runs the SA7-103 (v1.1) ROM with @johnparker007's original hack.
When offering natural nudges, it will always give you the Skill Nudge type.
Donkey_Kong_(Maygay)_[Dx08_Patch2_10jp].gam - This game file runs the SA7-103 (v1.1) ROM with @johnparker007's alternative hack.
This offers Skill Nudges after every reel spin.

Donkey_Kong_(Maygay)_[Dx08_Patch3_10jp].gam - This runs the SA7-103 (v1.1) ROM with a further revised (fine-tuned) hack based on 'Patch1'.
The frequency of natural nudges is increased, which always gives the Skill Nudge type.

'Patch3'  is now very close to the behaviour of the original emptiable v1.0 ROM with Cancel held down.

Therefore 'Patch3' is my recommended game to play to re-create the original emptier behaviour.
DX Changelog

. Patch version 1 incorporates @Chopaholic RAM file, which has allowed the game to settle with around £1800 cash in.
. Patch version 2 runs from a .RAM reset, so you can experience the locked IM method quickly to full empty.
. Patch version 3 runs from a .RAM file which has had around £400 IN. It's about £10 to £20 away from it's 3rd Steak/IM.
. Layout darkened (no longer an eye bleeder, but you may need a miners lamp now!)
. Lamp masks added
. Alpha converted and improved
. £1 input lockout detection added (useful for AutoPlay)
. 20p input added, shortcut 9 (lockout also added)
. Reels from Dad's DX added
. Reel gradients and masks added
. Coin output effects added
. Meter effects added
. Percentage changed to 82%
. £10 decal from Dad's DX added
. Cancel button shortcut changed to ` from Z
. Checkbox 27 added for £1 level HI
. £1 mech off lamp added
. Door switch numbers corrected
. F3 background added from Johnparker007 arcade
. AutoPlay profile added
. Jackpot 777 now blended to correct 2 lamps (1 lamp only before)
. Donkey Kong Logo now blended to correct 8 lamps (1 lamp only before, which was also the incorrect lamp)
. £10 cash decal now blended to 4 lamps
. Kong at top now lit and blended to 3 lamps (this was previously unlit)
. Super Mario character lit and blended to 1 lamp (this was previously unlit)
. Super Mario button changed to correct lamp
. Super Mario Text above button changed to correct lamp
. Go Bananas lamps sorted (incorrect lamp order before)
. Go Bananas - title lamp lamp removed, this was not lit on the real machine
. Number reel gradient improved
If you want to play this layout with improved lighting, then refer to my guide below.
 

Here is a series of layout mods for Pook's brilliant PEN1 DX.   The purpose of this was to simply test different ROM sets (I found out later we only have a few) and sort the versions we had. I made some small changes to the existing DX to facilitate this work, and with Pook's permission it made sense to now release these to the scene for anyone who has an interest in playing the PEN1 game at different stakes and prizes on an earlier ROM set than the previous £250 DX (which used 750-846 dated 20th August 1996) Notes:
3 DX's with different stake/JP all using the same ROM revision 750-257 v1.2 dated 26th July 1994: 5p-£75  | 10p-£100  | 20p-£200. DM Busy flag changed over to switch 36 to fix sync issues between normal game code and dot matrix code (e.g. Capone's Caper out of sync etc.) Pay-out custom sounds Changed colours on Dot Matrix and 7 segment displays to match original machine a bit closer (personal preference) Learnt from Pook's amazing Happy Hour DX on how to do masked DX's which can incorporate full screen (F3) artwork whilst not requiring the original side art to be hidden. I wish I had looked into this with CCnR. Each DX has a different background just to try and add to the realism and provide some variety, all just examples of what you can do. AutoPlay profile added and used to get all DX's JP happy and CP's full. Added flyer/cabinet/game photos  and .db files for MFME Game Manager. Added game manual PDF It would seem that these ROM versions opposed to the 25p/£250 version give a better game overall. Interestingly the 25p/£250 game has a completely different BFM internal project ID PR6574 whereas these versions have ID PR6331. This wasn't the case with CCnR which shared the same project ID across all versions including the later 25p/£250 ones.
This mod was released with Pook's approval, and the credit must go to him for the DX layouts.
I am only adding a few things here and there to these DX's and it's a simple job for me tinkering around like this. The work that layout designers do, both classic and DX layout's is the tough stuff.
Hope you enjoy and it's great to see people playing these DX's and talking about them.
Cheers,
Mort.

Here is a series of layout mods for Reg's brilliant CCnR DX.
The purpose of this originally was to simply test different ROM sets and sort the versions we had. I made some small changes to the existing DX to facilitate this work, and with Reg's permission it made sense to now release these to the scene for anyone who has an interest in playing the CCnR game at different stakes/prizes/rom revisions.
Notes:
5 DX's using different ROM revisions: 5p-£75      (750-190 v9.1) (ROM date = 20/01/1994) 10p-£100 (750-628 vK.1) (ROM date = 02/02/1996) 20p-£150 (750-154 v5.3) (ROM date = 16/11/1993) 20p-£200 (750-118 v1.2) (ROM date = 20/07/1993) 25p-£250 (750-859 vL.1) (ROM date = 02/09/1996) Lamp masks Blended lamps on win matrix bottom glass Pay-out custom sounds Meter effects Changed colours on Dot matrix and 7 segs to match original machine a bit closer (personal preference) Reel gradients Added one of Reg's casino backgrounds for ambience in F3 (full screen) mode BUT original art remains if you want to drag it all back into view (the reel bands on the side art have been added as an image to this download post) All ROMs are included as a separate download with a visual guide AutoPlay profile added and used to get CP's full around £3000/£4000 IN Added flyer/cabinet/game photos  and .db files for MFME Game Manager This mod was released with Reg's approval, and the credit must go to him for the original classic and DX layouts.
Cheers,
Mort.