6502.Net

BuildStatus

Master

Overview

This is an implementation of the 6502 CPU simulator written in C#.

Features

• 6502 processor and memory
• Interrupts
• WPF Test Harness
  • Set break points
  • Step through program
  • View registers and memory

Version History

• 1.1 Cycle Accurate, other improvements
• 1.0 All of Klaus Dormann's Tests pass successfully.
• 0.9.9 All OP Codes Implemented.

References

• http://visual6502.org/wiki
• http://homepage.ntlworld.com/cyborgsystems/CS_Main/6502/6502.htm
• http://www.atariarchives.org/alp/
• http://en.wikipedia.org/wiki/MOS_Technology_6502
• http://www.obelisk.demon.co.uk/6502/
• http://www.6502.org/tutorials/

Test Programs

I used the Klaus Dormann 6502 Test Suite (GPL License) to validate the simulator.

http://2m5.de/6502_Emu/

Compiling Tests

1. Grab the AS65 Compiler http://www.kingswood-consulting.co.uk/assemblers/

2. Modify the 6502_functional_test.a65

   load_data_direct = 0
   

3. Run the following command to generate the bin file and lst file

    as65 -l -m -w -h0  6502_functional_test.a65
   

4. Load the test in the simlator.

   1. Set the Memory Offset to be 0x0400
   2. Set the PC to 0x0400.

The Program Listing starts at 400