@pho4cexa@tiny.tilde.website @dirtycommo@anticapitalist.party The manufacturer describes them as intended for "single-task specialized applications in larger batches." Furthermore, the links to the datasheets are no longer available(?). https://wch-ic.com/products/productsCenter/mcuInterface?categoryId=94 On the other hand, the RISC-V CH32xx variants offer more memory, have no addressing limitations (32-bit), support not only USB device mode but also USB host mode (!), and the boards are sold in pairs on AliExpress 🤣 https://wch-ic.com/products/productsCenter/mcuInterface?categoryId=76