Open source license: CC-BY-SA 3.0
Most 512k (E)EPROMs should work. They usually have one of the following identifiers in their names: 27C040 or 28C040.
You can create a games/software collection with a selection menu on a single cartridge using the MagicDesk Cartridge Generator software by Zzarko. You can also create a cartridge with just one game/program without a menu using the Single PRG Cartridge Generator software by Feandreu. How it works is explained on the respective website. A BIN file containing the image for the cartridge is created in each case.
There are numerous programming devices/EPROMers. The MiniPRO TL866 is used in these instructions. This is available for around €50 and supports almost all (E)EPROMs.
After starting the MiniPRO software, search in the IC database for the (E)EPROM used. The (E)EPROM must now be correctly inserted in the socket. A click on the "Information" button shows how this must be positioned. Pay attention to the notch and to pin 1. If an EPROM (not EEPROM) is used, the following must be observed: Make sure that the EPROM is empty. A "blank check" provides information about this. An EPROM that is not empty must first be erased. EEPROMs, on the other hand, can simply be overwritten. Open the cartridge image (you can find one in the software folder) and confirm with "OK". Now click on the "P" button and confirm with "Program". The (E)EPROM will now be burned. So that the EPROM does not lose its data, the glass pane should be sealed with an opaque adhesive tape. An EEPROM does not have this window and there is also no risk of the data being lost.
The (E)EPROM is now ready for use and can be plugged into the socket of the cartridge. Important: Pay attention to the alignment of the notch on the (E)EPROM! It must match the notch on the module PCB.
In contrast to EEPROMS (Electrically Erasable Programmable Read-only Memory), EPROMs cannot be overwritten with new data, but must first be erased with an EPROM eraser. This sends ultraviolet radiation into the EPROM. This erases the memory, which can then be rewritten. A cheap EPROM eraser is sufficient. Don't forget to remove any UV cover from the EPROM. The erasing process takes 10-15 minutes in most cases. The EPROM can then be written to again.
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