Make a simple cartridge to test the basic functionality of your Coco. From ROM to RAM. Video, serial, sound keyboard and more.

Check out my video at https://youtu.be/0L6OtoY7bHo

ROM Files are attached to this project or can be downloaded from https://archive.org/details/coco-cart-diagnostic-rom

Requires 1 EPROM. 27c512 is recommended to use my exact rom, but you can use others. If you do use a 27c512, you can burn 4 programs to the one rom (at 16kb intervals on the chip) and change them by changing the jumpers.

4k:

* Install 2732 at U1

* JP2, JP3 not used

8k:

* Install 2764 at U2

* Set JP2 to 1

* Set JP3 to 1

16k:

* Install 27128 at U2

* Set JP2 to 1

* Set JP3 to 1

32k:

* Install 27256 at U2

* Select 16k bank with JP2

* Set JP3 to 1

64k:

* Install 27512 at U2

* Select 16k banks with JP2 and JP3

Special thanks to for the board design

https://github.com/linuxha/CoCoEPROMpak

Thanks to Gadget Reboot for introducing me to the board.

https://www.youtube.com/watch?v=7ILHTM3gZes