6502 emulator test code. Virtual 6502 Assembler: A simple, but compatible 6502 assembler for the web. ts is build around Klaus Dormann's test ROMs. It passes Klaus Dormann’s functional test suite for the 6502 and the extensive decimal mode (BCD) test for ADC and SBC instructions by Bruce Clark. asm from hcm-6502 My compiled version can be downloaded here. 11/2020 NOTES / TODO All 6502 legal opcodes emulated Decimal mode is not handled Test program /Klaus2m5/6502_65C02_functional_tests - will succeed if decimal is disabled. It shows the state of the registers after the program runs in the righthand column. VSCode as an Integrated Development Environment cc65 for programming in assembly language LLVM-MOS for programming in C Neo6502 emulator for testing The repository has examples using both 6502 assembly and C. branching on page boundaries). a65 is an assembler sourcecode to test all valid opcodes and addressing modes of the original NMOS 6502 cpu. Nov 30, 2014 · 6502 Klaus Test Program Page 1 of 3 Go to page 1, 2, 3 Next Page 1 of 3 Go to page 1, 2, 3 Next Board index » 6502. Click the Assemble button. org topic "who knows a full test code for 6502?" 6502. org Users Forum » Emulation and Simulation All times are UTC Nov 30, 2025 · There are many ROMs available that test an emulator for inaccuracies. Each example has a README. My compiled version can be downloaded here. e. It's a more rigorous suite covering the documented opcodes, using actual 6502 code to execute the tests. org topic "Running test6502. org topic "Looking for test program" 6502. org topic "Functional Test for the NMOS 6502 - request for verification" This is a set of functional tests for the 6502/65C02 type processors. Generally, the emulator simulates a NMOS 6502 MPU. The 65C02_extended_opcodes_test. md file that explains how to compile and run the example. Testing your emulator I have compiled a 6502 test suite which I found the source code to here: AllSuiteA. The result of the program is pulled directly from the CPU's accumulator. Using the tools presented here, you can accurately test your 6502 code and perfect it before ever loading it into an actual machine. Click the Run button to run the program. Hope y'all appreciate it, feel free to give me feedback and to contribute! Jun 23, 2020 · To use the emulator: Copy and paste or manually enter the assembly code into the large text area. Feb 10, 2022 · Emulator tests nesdevwiki page 6502. Emulation is a facinating and incredible capability. Tests for all valid opcodes of the 6502 and 65C02 processor - Klaus2m5/6502_65C02_functional_tests Feb 10, 2022 · For the most part these test programs aim to test emulators, which are subject to different bugs than CPU implementations, and therefore the effective coverage may not be as good as expected. This site contains documentation for the various MOS 6502 opcodes and concepts, an editor that lets you write your own programs and a simulator that lets you run these. The emulator also dumps its memory before exiting for further debugging. spec. The emulator only shows you what's going on under the hood of a 6502 CPU by executing a simple program (you could load yours) that the user must single-step. a65 on Py65" 6502. Load the 48 KB binary into your emulator's memory space at $4000, which leaves 16 KB of read-write RAM below it. This is a sample test program which calculates the nth term in the Fibonacci Sequence. cpu-klaus-dormann. Source Code I have compiled a 6502 test suite which I found the source code to here: AllSuiteA. . org topic "New 6502 core" For Ruud's announcement 6502. Counting cycles individually for each part of an instruction is cumbersome and probably should just deduct the correct number at the end of the instruction. The 6502_functional_test. The emulator works well, but it is missing Decimal Mode and proper unit tests for certain scenarios (i. You can check for any assembler errors in the message box at the bottom of the page. ts is the original set of tests that I wrote to prevent basic regressions. It featured 4KB or 8KB of RAM and a monitor program (WozMon) packed into just 256 bytes of machine code. This specific program considers the first 0 in the sequence as term 0, thus term 10 would be 55. a65c tests all additional opcodes of the 65C02 processor including undefined opcodes. org topic "Op-code testing" 6502. Dec 28, 2024 · To test our emulator, we’ll use the Apple I computer, Apple’s first product from 1976. This unintentionally turned this project into an emulator for the C74-6502, but I am still happy with the outcome nontheless. asm from hcm-6502. 6502 emulators on Windows and other platforms, free 6502 emulator downloads, as well as savestates, hacks, cheats, utilities, and more npm install npm build Testing The emulator has 3 primary test suites: cpu6502. kby joe wiq rwy xyg idk ici rim jmf twx crd grv jdf dxx eee