ec1841 stuff:

https://gist.github.com/shattered/6751786 -- native keyboard
https://gist.github.com/shattered/6751887 -- DIP switches, memory banking

Keyboard dump: 1816BE48.BIN in http://eska.xost.ru/soft/1841rom.zip

Memory banking: the machine can hold 4 memory boards of 512K each. The API is very much like XMS INT 15h interface (AH=87H and AH=88H). VDISK.SYS in DOS-clone (ados0201 in the softlist) definitely can use it.