This is a dual 5V-to-RS232 converter designed for use with the FTDI-style 5V serial ports found in many RC2014-type retrocomputers. It allows real RS232 devices to be connected, rather than serial USB ...

Other devices have RS232 ports, usually either DB9 (PCs, enterprise-class network hardware) or RJ45 (Cisco). In order to be ready to connect a laptop to any encountered device, one's commando kit must ...