Looking for a keyboard for the Leicester Retro Computer museum for the Sony HB900. yes I know there is one at the bottom of the ocean, but looking for one for a small cost.
The F900 was only released in Japan. Any keyboard will work but the characters printed on the keycaps won’t correspond to the character displayed by the machine unless you find a Japanese keyboard for an F500 or F900. It is possible to replace the BASIC/BIOS in a machine to match the keyboard (it does require desoldering the original ROMs).