W65C265SXB - WDC Xxcelr8r Engineering Development System- Board Featuring The W65C265S 8/16-bit Microcomputer

I really do like this experimenter board. One cautious note, however: you'll need to install the correct USB->Serial driver from FTDI's website onto your PC first (ftdichip.com), and as well as one of the readily available terminal emulator programs (e.g., Tera Term, PuTTY, etc.) so you can talk to the SXB, which communicates at 9600 8N1 using hardware handshaking. Do all the above first, and you'll be successful in installing and talking to the board via your PC. Do yourself the additional favor of downloading all their manuals on their website (all in PDF format). I also purchased the Programming the 65816 book by David Eyes and Ron Lichty, recently republished by WDC (available at Amazon). You really do need all this collateral. Their TIDE tool is great - use it for writing your own C or assembler programs for the 816.My overall feeling is that the board is well crafted, well thought out, and highly usable. I wish it came with more user memory (comes with 32K), but there is an open FLASH socket, so expansion is rather low cost and easy. This is not a beginner's tool - you really need to understand device architecture, bare metal programming, and have the needed patience as you develop your application.The expansion pin-row headers were a great addition to the design, much as can be found on other SBC's. It really opens up the opportunities for hacking and designing new functions, peripherals, extra memory, etc. One need not have access to professional PCB's - just a 0.1" center-center proto board that can be cut to fit, and with the inclusion of pin-row sockets to mate to the SXB's headers, you're well on your way to custom hardware.