Adding an SD card reader to my 6502 computer – Mike's Software Blog
Adafruit 254 Digital MicroSD Card Breakout Board with 2 Gb+ of Storage Works Great with Arduino or 3 v or 5 v Systems: Amazon.co.uk: Computers & Accessories
Technoblogy - I2C SD-Card Module
Downloads | Adafruit MicroSD SPI or SDIO Card Breakout Board | Adafruit Learning System
Connecting Nicla Sense ME to an Adafruit micro-SD Card reader - Networking, Protocols, and Devices - Arduino Forum