mc400
There are 3 repositories under mc400 topic.
PocketNerdIO/ctran
Recreation of CTRAN.EXE, the Psion OO C preprocessor from the SIBO C SDK.
zedstarr/MC400_ROM
Psion MC400 ROM image & software repository plus some hardware (ROM chips & keyboard) details
zedstarr/PsiPi
Some Pi scripts and Psion OPL to link the Psion MC400 to the internet via an attached Raspberry Pi