Amazon.com: Mini Base Board for Raspberry Pi Compute Module 4, with Standard CM4 Socket and Raspberry Pi 40 PIN GPIO Header, Onboard Multiple Connectors, Suitable for Compute Module 4 Lite/EMMC Series Module :
Raspberry Pi arrives on PC/104... sort of
PCIe/104 Products - Connect Tech Inc.
1pcs 2.54mm 1x40p 40pin Female Stacking Header Connector Single Row Straight Pc104 For Raspberry Pi 2 Mode Needle Length 12.2mm - Integrated Circuits - AliExpress
Amazon.com: Waveshare Compute Module 4 IO Board Pack with RPi Zero V1.3 Camera Cable 15 CM (No WiFi) Compatible with Raspberry Pi Compute Module 4 : Electronics
Raspberry Pi - Wikipedia
Is there a Windows-based single board PC that is similar in size to a Raspberry Pi? - Quora
Raspberry Pi arrives on PC/104... sort of
Amazon.com: SunFounder USB 2.0 Mini Microphone for Raspberry Pi 4 Model B, Module 3B+, 3B 2 Module B & RPi 1 Model B+/B Laptop Desktop PCs Skype VOIP Voice Recognition Software : Electronics
Mini Base Board (B) for Raspberry Pi Compute Module CM4 — KKSB Cases