Retro Erick is presenting in video the PicoMEM ISA card made by FreddyV (FreddyV on Twitter).

This card is a must for all PC XT, even for 286, 386 and 486+, its features are (and more are on the way, see the github) :

• integrated BIOS
• less than 640 Kb ? You can fill up to 640 Kb (16 Kb granularity), it's possible to have up to 736 Kb of conventional memory
• EMS memory (2 Mb)
• up to 2 virtual disks drives and 4 virtual hard disks (up to 4 Gb). The images are on a SD card and can be created directly from the BIOS (recent feature)
• USB mouse but you must use a USB OTG hub with its own power !
• NE2000 network card support using wifi (it's better to be near your wifi router)
• POST code for PicoMEM cards rev 1.1 and 1.11 with this Sparkfun screen