Western Design Center's 65xx Engineering Development Systems are educational and industrial strength Engineering Development Systems based around world renowned 8/16-bit microprocessors. The W65C816SXB and W65C02SXB feature vast I/O provided by the on board W65C22 VIA, W65C21 PIA, and W65C51 ACIA peripheral ports. The 816 SXB provides easy access to the vast flexibility in design possibilities using Addressable Register Architecture (ARA). The addition of the XBus allows for expansion beyond the standard on board peripherals by providing full Data Bus, Address Bus and Control Signal access. The W65C134SXB and W65C265SXB feature proven functionality for applications in production that require in-system diagnostics featuring internal system monitor ROM. If you need robust math for applications in sensing, such as pressure, temperature, revolutions per minute, flow monitoring and control, variable climate control or other systems for scientific, automotive, communications, home appliance/automation, then you'll benefit from the ANSI Standard C compiler.