**Description:**

Up for sale is a genuine **Microchip FS-USB Demo Board** powered by the high-performance **PIC18F4550** microcontroller with full-speed USB 2.0 capability. This board is an ideal development platform for prototyping USB-based embedded systems, custom Human Interface Devices (HIDs), and USB-to-UART/Serial (CDC) communication solutions.

### What This Board & Application Do

The onboard PIC18F4550 features a built-in USB 2.0 full-speed transceiver and hardware packet buffering. Combined with the pre-loaded or customizable firmware solutions (such as USB-CDC virtual COM port stacks), this hardware allows your microcontroller project to:

* **Communicate via Virtual COM Port (CDC-ACM):** Enumerate directly as a standard serial port on modern Windows, Linux, or macOS machines without proprietary drivers, using the native `usbser.sys` driver stack.

* **Handle Bi-Directional High-Speed Data:** Execute control transfers, bulk-IN/OUT data piping, and interrupt endpoint communication over USB.

* **Serve as an Embedded Testbed:** Act as a reliable hardware target for evaluating firmware stacks, testing custom USB descriptors, and building interactive serial-controlled peripheral projects (such as real-time MCU-to-PC command lines or remote telemetry systems).

### Key Features & Specifications

* **Microcontroller:** Microchip PIC18F4550 (Enhanced Flash 8-bit MCU with USB support)

* **Clock Source:** 20 MHz crystal oscillator with internal PLL configured for full-speed 48 MHz USB operation

* **Connectivity:** Dedicated USB connection port alongside an ICSP (In-Circuit Serial Programming) header for hardware debuggers and programmers (e.g., PICkit / MPLAB Snap)

* **Onboard Peripherals:** User test LEDs, flexible prototyping layout, and support for hardware/software I2C expansion

### Condition

* Fully functional, clean, and well-maintained.

* Perfect for students, embedded developers, and hardware hackers looking to explore native USB protocol implementation down to the descriptor and endpoint level.

* Application ready to for Windows, Linux or Web Browser - all written in the Open Source compiler - GCBASIC