Parallax Inc JTAGulator, Debugger, Programmer

On-chip debug (OCD) interfaces can provide chip-level control of a microcontroller device and are frequently used to extract program code or data, modify memory contents or affect device operation while it is running. Manually locating available OCD connections can be a difficult and time consuming task, sometimes requiring physical destruction or modification of the device. JTAGulator is an open source hardware tool that assists in identifying OCD connections from test points, vias or component pads on a target device.

24 x I/O channels with input protection circuitry
Adjustable target voltage: 1.2V to 3.3Vdc
Supported target interfaces (as of firmware v1.1): JTAG/IEEE 1149.1, UART/asynchronous serial
USB interface for connection to host computer
Can also be used as a development board for the Propeller 1 multi-core processor

Complete engineering documentation for JTAGulator, including schematic, bill-of-materials, PCB files, assembly drawing, source code, system-level test procedure, demonstration code and videos, is available from:
www.jtagulator.com

The Propeller™ 1 microprocessor chip makes it easy to rapidly develop embedded applications. Its eight 32-bit processors (COGs) can operate simultaneously, either independently or cooperatively, sharing common resources through a central hub. The developer has full control over how and when each cog is employed; there is no compiler-driven or operating system-driven splitting of tasks among multiple cogs. A shared system clock keeps each cog on the same time reference, allowing for true deterministic timing and synchronization. Two programming languages are available: the easy-to-learn high-level Spin, and Propeller Assembly which can execute at up to 160 MIPS (20 MIPS per COG).