What is the thing next to the USB ports for? : r/ps2
Nice to know: What is PS/2?
Cracking open Sony's PlayStation 2 (slim case) | TechRepublic
Amazon.com: Kaico Playstation 2 PS2 SATA HDD Hard Drive Adapter for Playstation Expansion Bay Port. Use with McBoot FMHD, OPL, GSM. SMS, HD Loader for Running CFW and ISO Direct from HD :
PS2 RPI4 Part I: Restoration - Thomas Hunter II
PlayStation 2 Expansion Bay - Wikipedia
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File:Sony Playstation 2 SCPH-5001 V9 - Portas USB 1.1, do controle Dualshock 2 e do Memory Card USB 1.1, Dualshock 2 controller and Memory Card slot ports (19290890908).jpg - Wikimedia Commons