Sharp MZ 40K - 1978
Sharp, like Sinclair, started with a very simple circuit board computer the MZ 40K released in 1978 I kit form. It was sold as a training aid or just a toy! Input was a hexadecimal keyboard and output to 4 LED characters. It came with just 512 "bytes" though this was a 4 bit computer so the memory was also in 4 bits.
If anyone has one of these then I could offer it a very good home!!