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IC socket 24 pin |
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Commodore 64 PLA replacement
This project is about a Commodore PLA replacement.
PLA replacements for the Commodore 64 are available for quite a number of years and have grown increasingly sophisticated. Therefore you may ask why the world would need another PLA, and indeed, current available alternatives are technically sound. However, if you occasionally repair a Commodore 64, you will come to the realisation that you need spare PLAs on stock. Now I'm not saying people that make PLAs are overcharging, in fact, I believe for the work the makers put into them, you might already be receiving more than you pay for. However,ordering 10 PLAs somewhere for just for your own stock will cost you a fair amount of money, enough to make it not fun anymore.
Looking at this dilemma I did conclude I would need to make my own PLAs. I could clone an existing one, but instead took a look at well available parts that are easy to solder and program by commonly available tools. I saw a possibility with GALs and started work on my own PLA, and I did succeed.
GALs are available at very low cost on popular internet marketplaces can be programmed using the popular TL866 EPROM programmer. They are DIP devices and can therefore be soldered by novice solderers. A PCB is needed that wires the GALs together in the right way and for that you have come to the right place.
The required fusemaps and more information is available here:
http://www.freepascal.org/~daniel/c64pla/
Recommended manufacturing options:
- Thickness: 1.0mm
- Surface finnish: HASL lead-free
- Solder mask colour: Black
- If you order a panel, route-process: V-scoring
- For all other options, please select the defaults
Commodore 64 PLA replacement
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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Sorry to hear that. The project has always been designed for hand soldering, PCB factories are simply not equipped to do THT soldering at high speed, if programming is added to that, this kills the high speed at which a factory has to operate and then I am not surprised that costs go up. I sell pre-programmed kits for anyone who isn't able to program himself.
nevermind! I got my answer! Thanks for your exceptional contribution to Commodore 64.
Hi! I am busy setting up a website for this PLA that will carry the JED files. Please come back within a few days and they will be available. Yes, it does pass the famous Super Zaxxon test, and also all other tests done until now.
Well, first of all I consider them small, in my opinion they are large enough to be easy to solder. But their size is constrained because of the traces that run between them and the safety margins. The PCB was designed with 0.012" traces and 0.010" safety margin. PCBWay allows a safety margin of 0.007" and the size and a smaller trace could be used to create a larger solder pad. Nevertheless, absolute beginners have been able to solder this just fine, so I don't see much of a problem with the pad size.