VIC cartridge PCB eagle

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norm8332
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VIC cartridge PCB eagle

Postby norm8332 » Fri Sep 08, 2017 10:25 am

I'm planning on making up a basic cartridge PCB for 27XX EPROMs. I want a way to make single game carts for myself. I can already make the 3-D printed cases. Before I start designing the PCB myself in Eagle, I was wondering if a design is already available in the wild? If not I will start from scratch. Thanks.

Norm

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mrr19121970
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Re: VIC cartridge PCB eagle

Postby mrr19121970 » Fri Sep 08, 2017 12:10 pm


norm8332
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Re: VIC cartridge PCB eagle

Postby norm8332 » Fri Sep 08, 2017 12:51 pm

Yeah, I saw that. I was going to make at least 20 and it will be much cheaper with shipping to have the boards made in China. I also want a design file so more can be made. I will probably release the design to the public so anyone can produce them if a file isn't already available somewhere.

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srowe
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Re: VIC cartridge PCB eagle

Postby srowe » Fri Sep 08, 2017 2:45 pm

I have a library file that I've used. The width came out a little short on the one board I produced so it needs editing.
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eagle-library.zip
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norm8332
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Re: VIC cartridge PCB eagle

Postby norm8332 » Fri Sep 08, 2017 5:15 pm

srowe wrote:I have a library file that I've used. The width came out a little short on the one board I produced so it needs editing.


Thanks, that will help! I wasn't aware there was a library available. I will make sure to fix the size.

Norm

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srowe
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Re: VIC cartridge PCB eagle

Postby srowe » Sat Sep 09, 2017 1:10 am

I can't remember where I got it from. The pinouts were all wrong, I ended up re-doing it from scratch.

norm8332
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Re: VIC cartridge PCB eagle

Postby norm8332 » Thu Sep 21, 2017 5:18 pm

OK, I had a go at a basic 8K cart. I'm a novice at cart design so please let me know about all the errors and how I am going to blow up my VIC! It's basically a copy of the commodore 8k except (hopefully) adapted to a 2764.Thanks in advance. Any comments are welcome.

Cart1.jpg


Norm
Last edited by norm8332 on Fri Sep 22, 2017 8:30 pm, edited 1 time in total.

norm8332
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Re: VIC cartridge PCB eagle

Postby norm8332 » Fri Sep 22, 2017 7:59 pm

This is the latest one I switched the lines used for CS. I'm also starting on a 2-bank 16K with a 74ls00. When these are complete and tested, the eagle design files will be released to the wild. I can't hardy believe no one has ever done this. But after searching for weeks and not finding them I decided to clone the C= boards (for the most part). I like making custom "single" carts, and I think there may be others too that may want to make them without having to design a PCB or purchase the boards at triple the price. My total estimated material cost for a completed cartridge including board, EPROM and 3d printed case with label is only $4.00 each..Quite a bargain and I have the fun of building them.

Cart1.jpg

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alexjlopez
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Re: VIC cartridge PCB eagle

Postby alexjlopez » Sat Sep 23, 2017 3:06 am

Cool! If you don't mind me asking, where do you get the 3D printed cases and the vic labels?

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beamrider
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Re: VIC cartridge PCB eagle

Postby beamrider » Sat Sep 23, 2017 4:00 am

Sorry for being behind the curve but how do you actually get the board made once you have a satisfactory design file?

norm8332
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Re: VIC cartridge PCB eagle

Postby norm8332 » Sat Sep 23, 2017 4:49 am

alexjlopez wrote:Cool! If you don't mind me asking, where do you get the 3D printed cases and the vic labels?


Well there are a couple of big caveats to this, you have to own a 3-d printer and a color laser printer. I built 3 3D printers in 2014 during my "3D printer phase" that are mostly idle now and I own a couple nice color laser printers left over from a business I used to run. I am only taking consumables into consideration for the price of the case and label. :mrgreen:

beamrider wrote:Sorry for being behind the curve but how do you actually get the board made once you have a satisfactory design file?


I have used DirtyPCBs.com. They take the Eagle .brd file directly on the ordering page and provide a board preview instantly in the shopping cart. If you select slow shipping it is really cheap and the boards I received were good quality. For the hobbyist the slow shipping doesn't matter, but for production it takes too long. I have no plans on selling these though. The EPROMs come from ebay new at $1.00 each shipped from china.

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Floopy
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Re: VIC cartridge PCB eagle

Postby Floopy » Mon Sep 25, 2017 8:32 pm

norm8332 wrote: The EPROMs come from ebay new at $1.00 each shipped from china.


Where can I find some, the cheapest I see are about 3.00$ each :?:
-Floopy

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Mike
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Re: VIC cartridge PCB eagle

Postby Mike » Tue Sep 26, 2017 3:39 am

norm8332 wrote:Any comments are welcome.

You should consider routing the data lines CD0 and CD1 with vias, and CD3..CD7 between the left-hand side pins of the chip.

No reason to copy the original design in that point really. One could easily route a trace between through-hole pins already in those days; nowadays, you could fit an entire motorway in. :mrgreen:

A really *good* design would involve a proper ground-plane on both sides, connected with a regular grid of vias, and the trace between stabilizing capacitor and Vcc pin of the EPROM as short as possible. That's one for the experts. :)

norm8332
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Re: VIC cartridge PCB eagle

Postby norm8332 » Tue Sep 26, 2017 6:12 am

Mike wrote:You should consider routing the data lines CD0 and CD1 with vias, and CD3..CD7 between the left-hand side pins of the chip.

No reason to copy the original design in that point really. One could easily route a trace between through-hole pins already in those days; nowadays, you could fit an entire motorway in. :mrgreen:

A really *good* design would involve a proper ground-plane on both sides, connected with a regular grid of vias, and the trace between stabilizing capacitor and Vcc pin of the EPROM as short as possible. That's one for the experts. :)


Yeah, I agree fully. I just copied the original design because it was easy to do and it works. :D I am going to take your suggestion on adding a ground plane. The 16K will be routed between the pins like you point out. Thanks for the input.


Floopy wrote:Where can I find some, the cheapest I see are about 3.00$ each :?:


I got some here: (these have been tested)
http://www.ebay.com/itm/172447472569 and http://www.ebay.com/itm/172481257448

Norm

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Floopy
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Re: VIC cartridge PCB eagle

Postby Floopy » Tue Sep 26, 2017 7:53 am

Thank you!
:D
-Floopy


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