13 The Simulator

The exec09 simulator lets you run 6809 programs on your UNIX-like machine. It was developed to test that the compiler output was correct. The simulator is distributed separately from the GCC6809 patch.

The simulator is configured using Autoconf like most of the standard GNU tools.

13.1 Command-Line Options

13.2 Interactive Debugging

13.3 The Simple Architecture

simple is the default architecture and is the one that the ‘m6809-unknown-none’ targets. It simulates a machine which:

• has nearly 64KB of read/write memory,
• supports standard input and output via special I/O addresses. If the target program reads from $FF00, the simulator will read a character from its standard input and then return that to the target. If the target writes to $FF02, the simulator will write that character to its standard output.
• supports termination from the target. If the program writes to $FF01, the simulator will call exit() with that value.

13.4 The EON Architecture

EON is a more advanced machine which was developed to experiment with complex operating systems on the 6809.

13.5 The WPC Architecture

WPC is the hardware used by many pinball machines during the 1990's. The WPC simulation is primitive compared to that of existing emulators like PinMAME.