#6502 EMULATOR DOWNLOAD UPDATE#
#6502 EMULATOR DOWNLOAD PRO#

The monitor will display a color for any value in these locations. This is basically a view of the memory located between 0x200 and 0x5ff. There are plenty references and examples available for 6502 assembly. To assemble code, click the 'Assemble' button located in the lower left hand corner. The top left text box is the assembly input box. To use the Visual 6502, build it and run it, no arguments are required. Each of these opcode functions takes no input parameters, but returns the number of cycles used to complete the instruction.

Each opcode will index into the function pointer table, calling the desired method and doing whatever work needs doing.

#6502 EMULATOR DOWNLOAD UPDATE#

The Visual 6502 uses step() in a loop for its execution in order to update the interface as necessary.Р”В®ach of the opcodes in the HEV6502 is implemented as a function and these functions are called though a function pointer table the CPU has. The CPU has an execute() method that will run through the code, but it also has a step() method that will execute one instruction per call. The CPU will ask the memory where the program starts, and use that address to begin execution when execution is requested. Note though, that it needs a pointer to a memory interface object before it will be constructed. The HEV6502 will initialize itself once it is constructed. Note though that the CPU is designed to block during a memory operation, so it will wait until memory becomes available. Here you can implement memory however you want. The interface for memory classes are defined in the CPU.h header. An example is included as the BasicMemory class. To use the emulated CPU, implement a memory interface for it.

#6502 EMULATOR DOWNLOAD PRO#

pro project file and build the project this way. I'm no Qt expert, so I've only built this using Qt Creator, which you can download for a Linux or Windows platform. To build the Visual 6502, you need to have Qt4. The HEV6502 is only implemented as a class, so building it is up to the context of whatever project you want to use it for. An example of its use is also included in the Visual 6502.

There's also an assembler written for the 6502 assembly language included. There is a demonstration application called 'Visual 6502' which can be looked at as an example application for use of the HEV6502. This way, external devices can be emulated however is necessary, the CPU class only needs that interface done. There is an abstract class within cpu.h that exposes an interface for memory usage. Then implementation can be done however you like. The idea here is to implement a 6502's instruction and functionality generically in a C++ class.

6502 emulator download