This is a Sanwa Supply RS-232C conversion adapter, model DO9-9M25F. 9-pin to 25-pin. I'm not sure which is male and which is female, so I've included photos. Please check them before purchasing. I'm also selling other conversion adapters, and I'm happy to offer a discount for combined purchases, so feel free to ask. I used this several decades ago. Since the operation is unconfirmed, please consider it as junk. No refunds, returns, or cancellations are accepted after purchase. #DOS/V #PC-98