Projects / J51


J51 is a Intel MCS51 emulator with all the standard integrated peripherals. A disassembler with an integrated debugger is also included. Standard peripherals emulated are Timer 0/1 (Mode 0, 1, 2, and interrupts), serial interface in polled and interrupt mode, standard I/O, and ports 0 to 4. Microprocessors emulated are the Intel MCS 8051 (no peripherals), Intel 8051, Intel 8052, Philips LPC674, and Philips LPc900.

Operating Systems

Recent releases

  •  15 Sep 2010 20:15

    Release Notes: This is the J51 final release. It has better performance.

    •  30 Jun 2010 06:49

      Release Notes: A new user interface was added for Diseqc. Support was added for generic I2c. The source was migrated from CVS to SVN. Simulation performance was improved with a new memory model.

      •  03 Jul 2008 13:58

        Release Notes: Many bugs were fixed. The GUI and support for CMON51 were improved.

        •  07 May 2008 13:01

          Release Notes: The assembler panel now uses JTable. Performance was improved with the new design of the disassembler. The performance of Timer and Timer2 was improved. More compiled samples were added. The GUI was made better and more frendly.

          •  30 Dec 2007 13:25

            Release Notes: Bugs in many opcodes were fixed. Execution statistics were added. Partial support for CPUs of the Silabs family was added. Performance was improved and testing was done with Java 1.4.2 and better.


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