CASIO uses special 3-pin cables. This post from Casiopeia describes how to build your own; here, we’ll focus on the existing ones.

On Microsoft Windows, the proprietary CASIO software (typically, FA-124) requires the cable drivers to create a COM* (1 to 20) device. All of the cables also require you to install the serial cable driver manually. Once installed and plugged-in, to know what virtual COM port the serial adapter occupies, you shall use the device manager — it’ll usually be in the “COM and LPT ports” category.

On GNU/Linux, it all works directly and usually creates /dev/ttyUSB* devices that you can interact with, although you’ll need to be in the group allowed to manage them (usually uucp, but that depends on the distribution you’re using).

SB-62 cable

The SB-62 cable is the official calculator-to-calculator cable from CASIO. It is usually provided with the fx-7400GII calculator and above.

SB-88 and SB-88A cables

The SB-88 and SB-88A cables are the official PC-to-calculator cables from CASIO. It costs around 50€ (which is bloody expensive if you want my opinion).

They are distinguished by the presence of the ‘A’ at the back. I don’t know what the differences between them are (they both use the same USB Vendor & Product ID). The driver for both has been found by several people during the same person; this TI-Planet news sums this up.

To install and use these cables on Microsoft Windows®, see this tutorial.

Here’s a TI-Planet news describing how the cable is produced by MCT Components, and here’s [the driver for MS-Windows][sb88_drv].

Util Pocket cable

Util Pocket is just a maker on the Internet which made his own PC-to-calculator cables during the CAS50/CAS100 era. You can buy one here for ~25€.

This cable uses an FTDI chip. You can download the drivers for MS-Windows here. You’ll have to extract the archive contents in a separate folder, then go to the device manager, right-click on the unknown cable, find the drivers, and set, in the folder where you extracted the archive contents, the subfolder corresponding to your operating system as the search folder.