0c4c:0021 — EMP-21 Universal Programmer

This is the USB identifier for a EMP-21 Universal Programmer manufactured by Needham's Electronics. The vendor ID 0c4c is registered to Needham's Electronics with the USB Implementers Forum, and 0021 is the product ID that Needham's Electronics assigned to this particular model. When you run lsusb on Linux, this device appears as 0c4c:0021 Needham's Electronics EMP-21 Universal Programmer.

Linux

$ lsusb
Bus 001 Device 004: ID 0c4c:0021 Needham's Electronics EMP-21 Universal Programmer

You can filter directly with lsusb -d 0c4c:0021, or get the full descriptor dump with lsusb -v -d 0c4c:0021. Kernel messages from dmesg show the same pair as idVendor=0c4c, idProduct=0021.

Windows

In Device Manager, open the device, go to Details → Hardware Ids. This device reports:

USB\VID_0C4C&PID_0021
USB\VID_0C4C&PID_0021&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_0C4C&PID_0021"

macOS

$ system_profiler SPUSBDataType
    EMP-21 Universal Programmer:
      Product ID: 0x0021
      Vendor ID: 0x0c4c  (Needham's Electronics)

Having driver issues with this device? Most USB devices are handled by a generic class driver; if yours shows up as an unknown device, confirm the ID above first, then check the manufacturer's downloads page.

The exact lines this page is generated from, in the upstream source file:

0c4c  Needham's Electronics
	0021  EMP-21 Universal Programmer

See all 1 devices from Needham's Electronics →