PCMCIA cards are standardized in size but vary in thickness. The height and width are identical to a credit card (85.6 mm × 54.0 mm).
You have a vintage laptop running Windows 95, 98, or XP and want to get it online or transfer files. pcmk card
Includes a 16-bit architecture, support for DH+ at speeds up to 230 Kbps , and a locking connector system for cables. Installation & Hardware Setup PCMCIA cards are standardized in size but vary in thickness
If you need to connect to DH+ or DH‑485 today, consider these alternatives: pcmk card
The PCMK Card Explained: A Forgotten Key to Industrial Automation