A Commodore IEC Serial Floppy Drive and WiFi Modem multi-device emulator

*** NOTE: ESP32 Firmware can be found in the following repo: https://github.com/idolpx/meatloaf-specialty

It's easy to wire up too. No need for the level shifter as shown in the circuit above.
(Espressif CEO confirmed 5V tolerance of ESP8255, ESP8285 & ESP32.)
You can also leave off the edge card connector if you you just want to try out the drive emulation functionality.

Components

Microcontroller

• 1 × ESP8266 Dev Board (Wemos D1 MINI/D1 MINI PRO 16M, NODEMCU, etc)
  I like the 16MB version.
  or
  
• 1 x ESP32 Dev Board (LOLIN D32 Pro)
  This one has 16MB Flash, 8MB PSRAM, Micro SD with I2C & TFT Port!
  (Please see the Meatloaf-Specialty repo for using this module)

Virtual Drive - IEC Serial Port (minimal build)

• 1 × 6 PIN DIN Male Plug
• 1 × 6 Core 26AWG Wire Cable (12" or better, I got extra)

Virtual Modem - User Port (optional)

• 1 × 24 PIN (2x12) 805 Series 3.96mm Pitch PCB Slot Solder Card Edge Connector
• 1 × 5x7cm Proto Board

To setup your own Meatloaf server check out this code. (https://github.com/idolpx/meatloaf-svr)

I'm now working to bring this functionality to the #FujiNet project too! They had the same idea but for Atari 8bit machines and are much further along than I am. I'm working with them to add CBM support to their device.

Key Features

• IEC Bus interface for loading data directly from flash memory or via HTTP
• Can mount Meatloaf's flash file system via WebDAV to modify contents
• Can be configured to emulate multiple IEC devices (IDs 4-30)
• Each device's configuration is switched out and persisted on access
• WiFi modem for connecting to telnet BBSs
• Minimal part count and easy to assemble
• Firmware can be updated via HTTP

To Do

• Standardize all Hayes Commands and add extended commands
• Complete CBM DOS support
• Extend CBM DOS with device specific features
• Support all different CBM file, disk, tape, cart media image files from local flash file system
• Add support for Fast Loaders & JiffyDOS
• Port all code to ESP32 IDF
• Add SD card interface
• Add Cassette tape interface
• Add virtual printer/plotter interface
• Add ZoomFloppy/IECHost capabilities
• Add .URL/.WEBLOC file support (change URL/DIR when loading them)
• If image isn't local, write saves to hidden folder ".save" (include hash of URL/PATH/IMAGE in filename)
• Add web server for configuration and control (http root hidden folder ".www")

References

• Commodore Peripheral Bus: Overview
• IEC disected
• Vice emulator file formats
• Burst Fastloader for C64
• Inside Commodore DOS

Code is based on and inspired by the following

• Steve White's Pi1541
• Lars Wadefalk's UNO2IEC
• Ingo Korb's SD2IEC
• Paul Rickard's ESP8266 Modem
• Ardyesp's ESPWebDAV