USB to DB25 RS232 Serial Adapter Converter Cable Null Modem FT231XS Driver for Sharp X68K X68000 PC Communicate Programming Cable How to make a null modem cable for X68000 <> PC data transfers Here are the pinouts for confirmed working null modem cable with partial handshaking. It is fully Magic Knights tutorial compatible, handles speeds up to 38400 bps reliably and supports hardware flow control. Signal name DB9 Female DB25 Male Signal name Chipset : FT232R+ZT213 Connector : USB to DB25 Male Serial Programming Cable Support both software and hardware handshaking. Works for Sharp X68K X68000 Replace your old DB9 to DB25 serial cable, connect DB25 port to your PC's USB port Industry standard FTDI chip set & device drivers to ensure maximum compatibility and superior reliability for industrial application Plug and play without driver installation. Works with all Windows and Mac OS versions. Heavy duty metal DB25 connector with locking screws on one end, plastic USB housing on the other end of the cable . The cable length is 6ft Data Carrier Detect (DCD) 1 4 + 5 Request To Send (RTS) + Clear To Send (CTS) Receive Data (RD) 2 2 Transmit Data (TD) T ransmit Data (TD) 3 3 Receive Data (RD) Data Terminal Ready (DTR) 4 6 Data Set Ready (DSR) Signal Ground (SGND) 5 7 Signal Ground (SGND) Data Set Ready (DSR) 6 20 Data Terminal Ready (DTR) Request To Send (RTS) + Clear To Send (CTS) 7 + 8 8 Data Carrier Detect (DCD) The X68000 (Japanese: Hepburn: Ekkusu Rokuman Hassen) is a home computer created by Sharp Corporation, first released in 1987, sold only in Japan. The first model features a 10 MHz 68000 CPU (hence the name), 1 MB of RAM, and no hard drive; the last model was released in 1993 with a 25 MHz 68030 CPU, 4 MB of RAM, and optional 80 MB SCSI hard drive. RAM in these systems is expandable to 12 MB, though most games and applications do not require more than 2 MB.