Sonsivri

Prog-Studio 2007 is a modern, comprehensive, and very productive micro-controller development environment for industry standard 8051 (MCS-51) microcontroller architecture chips.

Working programs could be created with a few steps. After that the program could be debugged - a hardware microcontroller is not nessasary, because Prog-Studio includes a source level debugger and a MCS-51 Emulator. Programs could be transmitted to the microcontroller with one click (ISP In-System-Programming).

Prog-Studio provides a high level of comfort for the MCS-51 developer through functions like Project Management, Dockable Windows, Code-Folding, and Edit & Continue. This type of functionality is typically only available for expensive IDE’s offering high-level PC languages. Beginners like Prog-Studio because they like the intuitive usability of this IDE and also the good examples, that help to understand the assembler language.

http://www.progshop.com/shop/software/prog-studio/index.html

COMMUNITY version:
The community version of Prog-Studio is dedicated to beginners, who desire to write there first microcontroller programs in assembler without the need to abandon the comfort of an integrated development environment. The useable program segment of assembler programs is limited to the memory eighth of the chosen microcontroller with an upper cap of 2048 byte (2 kilobytes). The first 48 bytes are always user programmable in foresight to redirect the interrupt service routines to a useable program segment address. This version is advised to everybody who is searching for a powerful and free development environment for small projects.
RESTRICTIONS:
-The useable program size is limited to the eighth of the microcontrollers overall memory with an upper cap of 2 kilobytes.
-Developed programs may NOT be used for commercial purposes.

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here is my program (clock program), but It can not compile because file size is overhead the limiting of  community version.

=> need full version :)