Old Macs used the serial port for printers. Also known as an RS-232 port, serial ports provide very slow speeds and have been superseded by USB on desktop computers. USB-to-serial adapters are ...

[Craig] cracked open a multimeter to unlock RS232 serial communications that can be used for data logging. There’s a couple of things that make this possible. First of all, the multimeter’s ...

Unfortunately, it’s not possible to simply bang graphical data out over the serial port, as the printer cannot keep up, and only has a limited buffer. It’s possible to get lucky sometimes by ...