![Smile :)](./images/smilies/icon_e_smile.gif)
I have another Dragon project on the go, and these were kind of a spin off from that. Here we have a simple Dragon 32 cartridge board which accepts either a 28 series eeprom or a range of SRAM chips. I made them to fit inside a Dragon Data cartridge case.
![Image](http://i188.photobucket.com/albums/z47/Rinkwraith/1_zpscc117fe6.jpg)
![Image](http://i188.photobucket.com/albums/z47/Rinkwraith/2_zps9dee1277.jpg)
![Image](http://i188.photobucket.com/albums/z47/Rinkwraith/3_zps69835122.jpg)
On the left, there's a jumper to disconnect the write signal - the Dragon can't actually write to the eeproms anyway (some kind of timing issue it seems) but I figured this was a good idea just in case. Down near the cartridge connectors there's another jumper to enable/disable the autostarting of ROMs.
The board pictured actually has a 32Kx8 SRAM chip in there. So it fills the 0xC000 - 0xFEFF range with near enough an extra 32K 16K of RAM. Not quite sure what you'd use that for; but as a slight side-benefit to the project, you can run a ROM image through drbincas e.g. drbincas ghost.rom GHOSTATK 41952 41952 and then load into the Dragon like you normally do your cassette files.
Pretty basic stuff - but I'm chuffed they actually work.
Edit: Maths fail - 0xC000 - 0xFEFF is 16K not 32K as I wrote.