{You really should look in my repo for updated info on this, but since this empty field beckons me to write something here I'll just copy the current text from my github repo}

You will need ESP-Open-SDK installed. If you don't already have it you can get it at https://github.com/pfalcon/esp-open-sdk. Just follow the installation instructions there and be prepared for a lengthy (but automated) process.

I've only setup this for for Debian/Ubuntu but most dists should be fairly similar.

Unless you already have git installed you should install it

apt-get install git

Then install the prerequisites for pfalcon/esp-open-sdk

apt-get install make unrar-free autoconf automake libtool gcc g++ 
apt-get install gperf flex bison texinfo gawk ncurses-dev 
apt-get install libexpat-dev python-dev python python-serial 
apt-get install sed git unzip bash help2man wget bzip2 libtool-bin

Install the esp-open-sdk

git clone --recursive https://github.com/pfalcon/esp-open-sdk.git
cd esp-open-sdk
make
export PATH=~/esp-open-sdk/xtensa-lx106-elf/bin:$PATH
cd ..

Install prerequisites for cpm8266

apt-get install z80asm cpmtools zip

Clone the cpm8266 repo and config your environment

Instead of setting and exporting these environment variables you could change the settings in the top of the Makefile instead

git clone https://github.com/SmallRoomLabs/cpm8266.git
cd cpm8266/code
export ESP8266SDK=~/esp-open-sdk
export ESPTOOL=~/esp-open-sdk/esptool/esptool.py
export ESPPORT=/dev/ttyUSB0

Compile the emulator and all cp/m disks and upload it to the ESP8266

make full

Connect to the emulator and boot into CP/M

Run any serial terminal emulator set to 8N1 at any standard speed between 300 and 115200 baud. To run any full screen CP/M programs you should have VT100/ANSI terminal emulation.

Just to get started you can install the "screen" package and use that as a serial terminal.

apt-get install screen

And then connect with:

screen /dev/ttyUSB0 9600

Press Enter twice to autobaud to get the EMON:-prompt and then B <Enter> to Boot into CP/M.

To compile with the wifi option enabled

Either do a BUILD=WIFI make full

or change the BUILD option in the Makefile.

After the full re-compile and upload of all disks you can connect via telnet port 23 (the default telnet port) after the red led (on the NodeMCU board) goes off. The led is lit as long as the wifi has not received the ip address via DHCP.