PIC32 Processor Plug-In Modules (PIM) Processor Plug-In Modules (PIM) are small circuit boards to be used with the various Microchip Development Boards to evaluate Microchip microcontrollers and dsPIC devices. These plug into the main processor socket of the Development Boards so that different microcontrollers can be used for prototyping, demonstration or development - quickly and easily. Microchip development tools such as REAL ICE™ and ICD3/4 connect directly to these development boards and provide quick, full-featured hardware/software/firmware development environment using the free MPLAB X Integrated Development Environment software. The Explorer 16/32 Development Board (RS 125-3449) takes 100-pin PIM modules.