I'm very new to programming and want to explore a project involving an older RadioShack electronic keyboard—the musical instrument, not a computer keyboard. It can connect to a television and display graphics, and I'd like to know whether it's possible to modify its software or otherwise add an option for displaying sheet music. How can I determine whether the keyboard is programmable or updatable, and what resources would help me get started?
2 Answers
The main limitation is probably the hardware. Some keyboards store their program in write-protected memory, so changing the software may require specialized electronics work or replacing a memory chip. Before attempting that, identify the exact model, search for technical or service manuals, and inspect what ports it has. If there’s no documented update method, a more practical project would be to build an external device—such as a small computer or microcontroller—that generates sheet-music graphics and sends them to the TV separately.
Start by finding the exact model number and looking for its manual, service documentation, firmware-update instructions, or information about the manufacturer’s development tools. A video output only means the keyboard can send a picture to the TV; it doesn’t necessarily mean users can change what the keyboard displays. Many older instruments have fixed firmware with no supported way to add features.
Where would I look to find out whether the software can be updated?

So I should first check the model number and search for service information before trying to change anything inside it?