Top ten innovations：  Top ten innovations： 1. It adopts the latest high-tech air-class magnesium alloy case, and imported flannel fabric bag. 2. A large number of devices using the latest technology and all SMT installed. Adopt imported tantalum capacitor. 3. Comprehensive protection to avoid any possible mistakes. The power supply adopts fast-recovery insurance, even if there is a short-circuit, it should be effectively protected. All IO ports are designed with anti-shock resistance and USB port is also designed with electrostatic prevention of the lightning strike. 4. Single USB interface, no extra power supply or serial port, real plug-in peripheral. Convenient for desktop or laptop without RS232 interface. This product adopts 3 chip structure, that is simulation chip + monitor chip + USB chip, which is a real individual simulator. 5. High speed of downloading at 115200bps, compared with the previous version, it is improved by more than 10X. 6. Does not occupy resources, no limit to simulate 32 I/O ports, serial port, T2 etc. 7. Compatible with keilC51 UV2 IDE, support single step, breakpoint, view/modify register, variable, IO and memory data anytime. Support pause during full run, the system will stop at point to the next line to be executed. Support simulation of all kinds of 51family chips, ATMEL, Winbond, INTEL, SST and ST. Support simulation of ALE disable, PCA, double DPTR, and hardware SPI. 8. Multi-frequency crystal options: could select 4/11.0592/12/24 MHz as you wish. Solve the unstable issue caused by long crystal cable. 9. Designed with system self-testing with speaker and LED indicator, convenient for debugging. 10. Designed with long pressing reset button to enter offline running mode, from PC perspective, the simulator works like a real chip on the target board. Integrated Development Environment to edit, build, download, simulate and debug within the same program. Debugging of 8051 programs in C, Assembly or mixed level. Debugged program can be simultaneously viewed in C and Assembly. Variable window to watch C variable names, values and addresses. Register window to watch the special function registers including 8051 ports. Memory window to watch and modify program memory and internal RAM. Call stack window to view list of function calls that lead to current program line ( traces all jumps and calls ) Terminal window to monitor 8051's serial port Output Window Debug Tab to watch debug messages Fully customizable window layout with dock able or floating debug windows. Stop Debugging button to stop Debugging at any point Go button to start execution Step Into and Step Over buttons to single-step through the source code at C or Assembly level Unlimited number of breakpoints to stop execution at any C or Assembly source line. Windows 95/98/ME, NT,2000/2003 and XP compatible Multi-file Editor to create and modify C or Assembly source code while simulating. Supports Micro C for 8051/52. Source level debugging for ASM & C compilers from Raisonance, Keil, IAR and others. Automatic switching between H/W and S/W breakpoints. Statistical Execution Profiler identifies frequently executed code with direct link to source code. In-line symbolic assembler and dis-assembler. Step-into, step-over and step-out of functions in C and ASM level. Command mode window with macros (scripts) for automated testing. Built-in diagnostic tests to ensure system integrity. Symbol Explorer browser to locate variables in modules and functions. Drag and Drop variables and addresses between windows for easier and faster viewing. Automatic variable value pop-ups in Source window. Locals and Global variable Watch windows with all complex types support (arrays, structures, unions, etc.). C-level Call Stack and CPU Stack windows. Special Function Register window with bit field names and descriptions. Trace window with back-correlation to source windows. Memory windows for Program, XDATA and IRAM Windows VISTA XP, 2000, ME, 98 compatible. USB (Full Speed 2 M bits/s)Real time background debugging Built in over-voltage/short circuit monitor Firmware upgradeable from PC Totally enclosed Diagnostic LEDs (Power, Busy, Error) Reading/Writing memory space and EEDATA areas of target microcontroller Erase of program memory space with verification Peripheral freeze-on-halt stops timers at breakpoints Built-in USB Reset self-reconnected function. High reliably ICs and Components. Compact design with mounting hole. Increased overcurrent protection Increased electrostatic protection Increased User Board first opened power protection Increased Users Board Overvoltage Protection The 51tracer Debugger connects using USB between the design engineer's PC operating with keil uv2 and their product board (target) being developed. It acts as an intelligent interface/translator between the two, allowing the engineer to look into the active target board's microcontroller, viewing variables and registers at breakpoints with MPLAB watch windows. A breakpoint can be set to halt the program at a specific location. The program can be single-stepped or run at full speed. At breakpoints, data and program memory can be read and modified. Additionally, the 51tracer Debugger can be used to program or reprogram the Flash-based microcontroller while installed on the board. System configuration： one simulator,once USB cable, one 40PIN simulator cap with DIP, one manual, textile bag, one CD( KEIL software evaluation)(If you buy this product with testing instrumental of XLxxxx series from our company, then it is not necessary to buy extra USB cable, simulator cap and the CD.) Hardware overview： USB interface：connect USB cable to PC,has the functionality of power supply and communication. Crystal selection：from left to right, oscillation frequency is 4MHz,11.0592MHz,12MHz and 24MHz.One can select any one of them( push up the switch to "ON"position ). Attention: it must have one and only one switch is set to ON, else the simulator may work abnormally. State indication：this light is a double-color LED. A single green flash means system reset; Continuous green flash means system running. Red color is for system self-testing, "ON" means low level TTL on P1.0 port. Reset button：two buttons are the same(one of them is for backup). When assert a short press on it, we can find a single green flash and a sound from speaker, this means the system is reset. When assert a long press on it(more than 3 second), we can find continuous green flash and two sounds from speaker, this means the system is running offline.    Shipped by UPS/Fedex/DHL/EMS to USA/worldwide, (about 3-5 days) Note: Please payment at the same time leave your telephone number, to facilitate the transport, Thank you!