Home PICBIT: A Scheme System for the PIC Microcontroller Marc Feeley and Danny DubÃ©, PICBIT: A Scheme System for the PIC Microcontroller, Fourth Workshop on Scheme and Functional Programming. November 7, 2003. This paper explains the design of the PICBIT R4RS Scheme system which specifically targets the PIC microcontroller family. The PIC is a popular inexpensive single-chip microcontroller for very compact embedded systems that has a ROM on the chip and a very small RAM. The main challenge is fitting the Scheme heap in only 2 kilobytes of RAM while still allowing useful applications to be run. PICBIT uses a novel compact (24 bit) object representation suited for such an environment and an optimizing compiler and byte-code interpreter that uses RAM frugally. Some experimental measurements are provided to assess the performance of the system. A very interesting perspective on language implementation, found via @dhess and previous discussion. Comment viewing options Flat list - collapsed Flat list - expanded Threaded list - collapsed Threaded list - expanded Date - newest first Date - oldest first Select your preferred way to display the comments and click "Save settings" to activate your changes.