Collapse OS, a doomsday operating system

Collapse OS is a Forth operating system and a collection of tools and documentation with a single purpose: maintaining the ability to program microcontrollers .

Options:

Driving on minimal and improvised cars.
Interface by improvised means (serial, keyboard, display).
Edit binary text and content.
Compile the assembly source for a wide range of MCUs and processors.
Read and write from a wide range of storage devices.
Assembly and implementation on another machine.

With a copy of this project, a capable and creative person should be able to build and install Collapse OS without external resources (ie internet) on a machine made of scavenged parts with low-tech tools.

The documentation is in text files in "doc /". Start with "intro.txt". Collapse OS can run on any POSIX platform and is easily built. Clone it, then see "/cvm/README.md" for instructions.

Can assemble Z80, AVR and 8086 binaries.
Can program AVR microcontrollers.
It has a command line text editor similar to the traditional Forth editor, as well as a visual text editor inspired by UNIX 'VI.
He has the full power of a fairly well-presented Forth performer.
He knows how to run on:
- An RC2014 via a serial link. It can also have a PS / 2 keyboard connected directly.
- A Sega Master system or a MegaDrive (Genesis) with video output and D-Pad input and / or a PS / 2 keyboard adapter.
- A TI-84 + with output on the LCD screen and input on the built-in keyboard.
- A TRS-80 Model 4P with built-in video and keyboard.
- A device compatible with the 8086 PC (including modern computers).
- A Z80-MBC2 via serial link.
- Any POSIX environment that simulates an 80x32 screen through ncurses.
Extremely simple:
- Z80 start code: ~ 550 z80 assembly lines
- 8086 start code: ~ 200 8086 assembly lines (8086 is significantly smoother than z80)
- Forth core: ~ 450 lines of Forth
- SD card subsystem: ~ 150 Forth lines and z80 asm
- Assembly Z80: ~ 300 lines of Forth
- Assembler 8086: ~ 150 lines of Forth
- AVR Assembly: ~ 150 lines of Forth
- Visual Editor: ~ 150 lines of Forth
- The whole "real" code (which would manage a post-collapse computer, which excludes cvm, emulators, POSIX tools, tests, doc): ~ 2800 lines
It has support for mass storage:
- SD cards
- 5 1/4 "floppy disks
Self-assemble on minimal resources:
- An RC2014 with an SD card adapter.
- A TRS-80 Model 4P with floppy disks.
- A Sega Master system with keyboard adapter, SD card adapter and dual EEPROM socket.
Constructed from a POSIX environment with minimal tools: only cc, make and ncurses are required.