Yeah, the M9's an odd duck. But it's a PoS keyboard though, and they're all odd ducks. Unfortunately, without the cable, it's pretty useless. I don't know if it's a Y-cable doing 4-wire RS232 for the switch/barcode, RS232 with SDL, or something else entirely. Though TBH it'd be a nice piece to add to a display collection just for the relegendable keys and it'll probably clean up pretty nicely.