We have a lot of obscure stuff in the datamuseum.dk collection... Did you ever want to read the listings of the firmware in the OKI Microline 82A and 83A printers ? Be our guest: https://datamuseum.dk/wiki/Bits:Keyword/COMPANY/OKIDATA You can also learn how to program a character generator EPROM. NB: "Do not make a dot pattern composed of any two neighbouring dots having a half-dot pitch in the same row."