Re: My Rock-ola 476

[Ed Inman]

The 476 profit setter can be replaced with the one from a 481, 483, 484, or 488: http://www.ebay.com/itm/ROCK-OLA-JUKEBOX-481-484-488-PROFIT-SETTER-CREDIT-UNIT-53360-A-WORKING-53355-A-/330869245894?pt=LH_DefaultDomain_0&hash=item4d095807c6  The profit setters in the 477, 478, and 480 machines were a little different but they all work the same AFAIK. --Ed

-----Original Message-----
From: Dennis Hanley
Sent: Apr 25, 2013 12:07 PM
To: rocko...@googlegroups.com
Subject: Re: My Rock-ola 476

Andre,
Is anybody making a replacement for the credit unit on the Max 477 that I
can buy?
I think my board has gone belly up.
Regards, Dennis

On Friday, 16 December 2011 17:28:14 UTC, golde...@yahoo.fr wrote:

> Basically the Rock-ola 476 is from the electronic point of view totaly
> equivalent to the 477
>
> In some previous messages I explained my project to redesign the
> "profit setter" board.
>
> Now the project is just finished and the JB works perfectly
>
> At the beginning I took the same idea as Jim and I redesigned a new
> board in relation with the software I wanted to write.
>
> I realized the project using the PIC 16F877, my objective was to have
> a board to board replacement without any changes in the original
> design, except the removal of the original MM5799 chip and its
> replacement by a flat cable to my prototype
>
> Also I decided to write the software in "C" language using the
> interrupt functionalities for the different input peripherals
>
> These peripheral are, the keyboard, the opto decoder, the scan level,
> the coin switches, the home and side (A/B) switches
>
> The home and side switches do'nt need to drive the interrupt. I
> started to design a 22V10 GAL to keep track of the other signal and to
> generate an interrupt signal
>
> I started to write the software and the first element to debug was the
> keyboard
>
> Rapidly I discovered that the transitions in the grid which
> multiplexes the keyboard and the display generated some parasitic
> signals, so I decided to handle the keyboard by the software which is
> pretty much simple to handle the switches rebounds
>
> Remainded the other input signal
>
> The coin switches were rapidly debuged as well the opto decoder which
> provide a very clean signal
>
> Regarding the selection memory, I have reserved a 160 bits area, this
> is pretty simple in CCS "C" language as the compiler provide a BOOLEAN
> variable type. Doing this, the software is able to memorize all the
> selection and the algorithm is very simple and fast, this is very
> important during the read phase
>
> The handling of the scan level was very straightforward, once the
> interrupt is received we keep control until the scan level returns to
> the normal position and the magazine returns to the home position
>
> The main problem I encountered was the displays electronic interface.
> These displays are VFD (Vacuum Fluorescent Display) devices, the
> cathode powered with a 15V negative voltage.
> These devices need a positive voltage on the grid and anodes with
> respect to the cathode voltage to get something displayed. These
> levels are to be interfaced with the TTL level from the
> microcontroller
>
> To debug the software I used the MicroChip "In Circuit Debugger" ICD2
> (mine is a third party device, pretty much cheaper) integrated in the
> MPLAB software. This equipement is connected on the prototype board
> and to the PC using USB interface. It can programme the chip, insert
> break points at the "C" language level , you can display/modify the
> files and special registers, An essential equipement to debug.
>
> Now after couple a weeks of hard job the JukeBox is back to work.
>
> In a near future I expect to have a video showing my job
>
> If you are interested to make your own, I can provide you with more
> technical infos regarding the electronics as well as the software
>
> Best regards
>
> Andre
>
> P.S. Be indulgent with my English, French is my mother language
>
>
>

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[Dennis Hanley]

Hi guys,

Any information you have on making a PIC board I would be interested in having. I've got my Juke working ok at the moment but I know 2 people that have PIC programmers & would like to make my own board just in case the worst ever happens. I've spent a lot of time & money refurbishing & I'd hate to see it become a doorstop for the sake of the Profit Setter going belly up.

OK about the later model unit Ed, I'll see what is available. 

Anybody know the best way to change the speaker cloth without making a mess of it? 

The perforated plastic is a bit of a challenge. I don't think its going to be re-usable. Best regards, Dennis.