Look what I have found in my old Take Five Cocktailpin:
A System Rom and 16K RAM to emulate the Hardwarecoded Custom Code of the 6530 and use the MPU with 6520 PIAs! And this is from 1987!!
I have dumped and save the Rom and try to redo the Shematics and order new Boards from PCBWay.

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I can´t tell the whole Story. I did buying the Cab last Year, 14 Months ago. Before I bought it, I checked it a little .The Cabinet was not fully working, but I can start and Play a Game with the MPU above. Also I bought it...
For Transport Ihad to disassemble the Cab.
At Home after Assembling a lot of Connectionprobs. The Cab itself has a lot of Waterdamage. The MPU a lot of Corrosion. one bad 6520, one bad 7404 and one bad 7425. Knocker Coil shorted. One Logic IC in the right Display bad. Many Tracks on the selfmade Rom PCB´s broken by Corrosion and so on...
But on this PCB´s you can read the Name "Dieter Habermann 1987"...

I find 2 Orginal MPUs in untested Condition. Both are bad, but now I understand that my own PCB has Custom PCBs... Trying to repair this 2 MPUs for Months with no Luck. At the End the Romsets are dead. Of 6 Roms you can´t get 1 working Romset...

Last Month I tried to repair the old MPU with the Custom Roms and get it bootable in under 2 Hours. But i musst say,- not tested in Cab yet.. But i need a break from this badly Cab or it goes out of the Window....
So I decided to read out the Eeprom and try to get a working Copy of this Customchanges for the other 2 MPUs...

The first Tryout you can see on the Pictures. The Custom Roms to install in the Sockets became very little, thx to SMD... The Ram and Rom I planned to piggypag on a PCB with the CPU together to minimise the most of the Solderingmess. Now they are 6 or 7 Jumperwires to solder. In a few Days I order the PCB´s at PCBWasys, but I like to check my own Drawings before I order.....

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Bit I don´t know that that I can get a working Copy, my Electronicskills are only "a Hobby".

I have ordered the PCB´s.

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Only to show real Pics. But its not fully assembled and not testet yet and some ordered parts don 't arrived me yet.

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Don´t worry, I´m working on this. But it need Time. I post a longer Info in a few Days,- musst go to my real Work now.

Can someone send me the technical Manual in a good Quality? Not the bad Scan in the Internet... Buying it from Flipper's. com cost more shipping than the Manuel costs. (to Germany).

Habe you recived my PM?

Prototype but not testet yet, the Orginal 1987 Build have Problems that musst fixed before. But nö readable Shematics, Boggie is not a Cocktail.

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I have two Sets of the Custom Roms that should fit on the Orginal MPU. The Project lives but I have no Time and no Shematics to get the MPUs Workable and testing the Custom Roms. Before I test the Custom Roms I musst be sure that the MPUs and the Wireing of Playfield are correct!

Due to a lack of time, I stopped the project and have since sold the cabinet.
This was not yet executable for me, but it should be possible for someone with logic knowledge and the necessary motivation to complete it.

However, I have drawn the circuit from the working solution from 1987 so far - here and there there will still be an error in the PCB, my solder bridges or my MPU. (One error is e.g. the missing voltage of the LS chips on the IO boards, which has to be created with a wire jumper, but is the only one I noticed.).

But since I still have all the documentation, I decided to put the documents online here after requests from the forum:

Primarily:
Secured Eprom
EasyEDA files with PCB and components

Someone in the know should get this to work.

Mangels Zeit habe ich das Projekt eingestellt und das Cabinet inzwischen verkauft.
Dieses war bei mir abschließend noch nicht lauffähig, sollte aber für jemanden mit Logikenntnissen und der nötigen Motivation fertigzustellen sein.

Die aus der funktionierenden Lösung von 1987 Schaltung habe ich jedoch soweit fertig gezeichnet,- hier und da wird jedoch noch ein Fehler im PCB, meiner Lötbrücken oder meiner MPU sein. (Ein Fehler ist z.B. die fehlende Spannung der LS Chips auf dem IO-Boards, welche per Drahtbrücke hergestellt werden muss, ist jedoch der einzige der mir aufgefallen ist.).

Da ich aber alle Dokumentationen noch habe, habe ich mich nach Anfragen aus dem Forum hier entschlossen die Unterlagen online zu stellen:

In erster Linie:
Gesichertes Eprom
EasyEDA Files mit PCB und Bauteilen

Jemand der sich auskennt sollte dies zum Arbeiten bekommen.

!!
DOWNLOADS EPROM AND SHEMATIC
EasyEDA Files,- you can export easy for PCB Way or other:
!!

https://drive.google.com/file/d/15DpJPFN0525IQqIuPL7zxGcZIGEN99yj/view?usp=sharing, https://drive.google.com/file/d/1izbEO2R0E9Q95UkkHaoENq3hhQZunRtA/view?usp=sharing, https://drive.google.com/file/d/1vj1q9XIfaFRrLgIbvxBb8XRW5AF2NU_H/view?usp=sharing
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Schematic_IO Logic_2022-10-30.pdfSchematic_cpu board fertig_2022-10-30.pdf

I´ve forgotten:

Edit 1:
You have to cut 7 Traces from the CPU Socket and reconnect these by Jumperwires.
Lock at the Picture and the Pinout of the CPU to identify them,- I don´t remember very well

The Pin "CON1" on the CPU PCB goes directly to the Trace "Pin16" from the 6504. You have to cut this Pin on CPU Side.
CPU Pins from Adapterboard like "IRQ" "Res" etc, are missed in the Shematic,- but connected over the long Adaptersocketpins.

In my first PCB is an Error and VCC not Connected to the LS260.

Edit 2:
The Customchips "6530" are replaced by the standart PIAs "6520". But this is possible,- the ROM and RAM of the Customs is replaced externaland added directly on the CPU Adapter Board.

But remember, this Customfix is from 1987 on my MPU Board that worked nealy 2018.
All 3 6530s are replaced by 6520s,- look the Pictures,- the Year 1987 is realistic too.
(The wrong Label on the RAM IC is my Fault,- it is very not a 16K IC...)

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!!
DOWNLOAD EPROM AND SHEMATIC
EasyEDA Files,- can easily be used for e.g. PCB Way:
!!

https://drive.google.com/file/d/15DpJPFN0525IQqIuPL7zxGcZIGEN99yj/view?usp=sharing, https://drive.google.com/file/d/1izbEO2R0E9Q95UkkHaoENq3hhQZunRtA/view?usp=sharing, https://drive.google.com/file/d/1vj1q9XIfaFRrLgIbvxBb8XRW5AF2NU_H/view?usp=sharing

Perhaps someone with experience can take a look at the eprom and determine the function.

The PCBs can be ordered immediately from PCB Way after import/export in EasyEDA. The components used can be found in the circuit diagrams.
The CPU socket is plated through the CPU board and must have long pins to piggyback the board onto the CPU socket of the original MPU.

2 problems you have to solve yourself:
1. The 7 additional jumper cables and separating the traces from the CPU socket directly on the original MPU. (But that should be the case if you compare the pinout of the 6520 ICs with the 6530)
2. The PCBs may still have 1 to 2 layout errors.

The original jumper cables will probably be removed.