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Amazon.com: 4-Port Raspberry Pi USB HUB HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W, 4 USB Ports Compatible with USB2.0/1.1 Onboard USB to UART Onboard Multi Indicators : Electronics
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OTG cable tested with Raspberry Pi 4. Add more USB sockets & OTG booting Windows 10 explained. - YouTube
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Appendix B. Raspberry Pi ports and legacy boards - Hello Raspberry Pi!: Python programming for kids and other beginners
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