i8086emu is an cross-platform emulator for the Intel 8086 microprocessor.
It has support for dynamically loadable device plugins and some peripherals like a PIT, PIC, 8-segment-displays, buttons and leds.
i8086emu comes with an ncurses and an GTK-2 gui
YASP (Yet Another Simple Processor) is a 8-bit microprocessor with microcontroller capabilities (I/O ports, REQ, ACK) that can be used as a small computer for educational purposes. Its development environment includes simulators and assemblers.
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.
GNUDE is a complete suite of GNU C, C++, Fortran, and Java Cross Compilers, and the GDB CPU Simulator and Debugger for embedded microprocessor applications development. Targets development for ARM7, ARM9, and XScale applications.
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Assembler and download/monitor for the new Rabbit 2000 (TM) microprocessor developed
by Rabbit Semiconductor and Z-World. Allows use of Linux as host development platform.