ATasm is a 6502 command-line cross-assembler that is compatible with the original Mac/65 macro assembler released by OSS software. The aim of ATasm is to provide Atari home-brew coders with a comfortable and powerful toolset.
Dev65 is a macro assembler, linker and librarian suite for the 6501, 6502, 65C02, 65816 and 65832 family of microprocessors coded in Java for portability. The code is based on a framework that could support other system architectures.
JBit is small java application for mobile phones (MIDlet) that gives you a programmable 8-bit microcomputer. With JBit, you can edit, save, run and debug assembly (6502) programs directly on your phone.
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Laser is a multiple arcade emulator available for several platforms. It uses Marat Fayzullin's Z80 and 6502 CPU emulators. It was originally based on Mike Green's SinVader.
Another NES emulator is a fun project. Goal of this project is to learn how to program an emulator and to get a deep understanding of the MOS 6502 processor.
A portable BASIC in the style of Microsoft 6502 BASIC (especially the Apple ][+ variant), with influence from GW-BASIC and Atari BASIC among others, with enhanced features, written in C for portability to computers large and small.
Robust 6502 processor core emulation + debugging tools. The goals are to provide (1) a portable core and (2) tools for teaching emulator developers about the 6502 and emulation in general.
Motorola/Clones 6502 emulator, There is two versions, one is opcode granularity (dead6502), the other is cycle granularity (dead6502v4). It has been used by myself in various projects requiring a 6502 emulator.
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An Apple ][, ][+, ][e, //c emulator written in portable C++. Should run on any computer. The 6502 emulator is written as an interface to be fully reusable.
A microprocessor simulator for unit testing assembly code in embedded systems. Written in pure Java, it works with JUnit on any platform Java supports. Micros include 6502, 6800, 8051, Z80, and others.
The Free 6502 emulator is a portable, extensible and configurable library for emulating the 6502 processor, used in many older computers and video games. It is aimed at reliability and speed, to allow it to be used to emulate any system based on the 6502.