- Joined: 28 Mar 2011
- Posts: 88
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32K SMS Cartridge with ZIF socket
 Posted: Thu Jun 21, 2012 12:20 pm
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Here is a board I made yesterday, for basic 32K (256k) EPROMs.
Better than a modified cartridge as you can get a ZIF socket in which clears the top of the console. (hence the extra height)
Probably useful for homebrew more than anything else but in any case I thought I'd post here in case someone can get some use out of it!
Has a DIP switch to allow swapping Pin 1 and Pin 27 from either Vcc or A14 line.
Most 256k EPROMs I saw had a pinout of one or the other. Some were even more different which would have required a much more complex design so I decided to stick with support for what appears to be the two most common variants.
The DIP switch could be replaced with jumpers if you were only ever going to be using one type.
The board can be made at home fairly easily. It's double-sided but otherwise it should not present too much of a challenge. The files were created with KiCAD
Vias are made with wire soldered on both sides - no plated through-holes and the larger copper areas were optimised for the negative UV process I used.
Capacitors values are the same as those used from an official cartridge (47uF and 0.022uF). I added a power LED for some reason but this is of course optional.
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- Joined: 05 Jun 2010
- Posts: 757
- Location: Pennsylvania, USA
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Posted: Thu Jun 21, 2012 5:09 pm
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Really cool. I really need to stop being lazy and build something like this someday.
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- Joined: 28 Mar 2011
- Posts: 88
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Posted: Thu Jun 21, 2012 9:43 pm
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If enough people were interested in this, I could always get some boards made.
(I expect not everyone wants to go to the trouble of making a PCB themselves, too)
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