The free 8051 Evaluation software toolset (RKit-Eval51) in conjunction with the Ride integrated development environment provides a code-size limited solution for compiling and debugging your applications for a wide range of 8051 microcontrollers.
The Eval51 includes all the tools in our 8051 software toolset with the following capabilities:
Ride6 integrated development environment
RC-51 ANSI C compiler, output up to 4Kbytes of code
MA-51 Macro Assembler, output up to 4Kbytes of code
LX-51 Code Banking Linker, output up to 4Kbytes of code
KR-51Tiny RTOS, supports up to 3 tasks
SIMICE-51 Simulator, debug up to 4Kbytes of code
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