Starting from the CPU uC firmware 4.64 custom OS images may be used and one was built from the original sources of the CP/M 2.2 from Digital Research Corp. Because CRISS has in-built BIOS support the new release provides 55 Kb TPA memory! All sources for the OS boot image are available, please download upgrades from www.criss.fun  website! Don't forget to upgrade CPU uC to version 4.64. OS starts now from the address DF00h! 4 virtual 720 Kb floppy drives (A-D) are supported. Hitech C and Janus ADA are now compiling fine without the leak of the RAM problem! New videos with ADA testing for the Youtube channel are preparing and will be available soon.

Fantastic, really? Coming very soon: next step memory optimized CPM 2.2 and CPM 3.0 support! Please follow!