There was a download of SIM535 2.45 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. SIM535 belongs to System Utilities. The actual developer of the free program is Hernando Vasquez.
We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. You can install this free PC program on Windows XP/7/8/10/11 32-bit. The most popular versions of the program are 2.5 and 2.4. SIM535.EXE is the default file name to indicate the SIM535 installer.
From the developer:
Sim535 is a a program which allows you to simulate the behaviour of the intels's MCS51 microcontrollers family 8031/8032/8051/8052 among others, and also with the siemens C535.
The siemens C535 is a powerfull microcontroller with a core based on the 8051. It has many features such as Analog/digital converter, Watchdog, Pulse Width modulation output, three timers, 6 I/O ports, 12 interrupts levels, etc.
You may want to check out more software, such as iPSP Movie Loader, Line 6 Monkey or DockWare Pro for Pocket PCs, which might be related to SIM535.