Quote Originally Posted by murdoc rose View Post
but since were on the topic why is it that there are so many carts out there but so few keyboards? I paid $3 for mine at a yard sale last year.
Oh, there's thousands of keyboards - it's just that the Miracle Piano NES set isn't as common as the Apple, DOS, Windows or other PC variants.

Software Toolworks sold upgrade packages. If you already owned a set, and wanted to use it on another system, you could order software plus the appropriate connectors for a new system at a price. The set I sold a while ago had an order form for Apple, DOS, and Genesis packages.