I´m a student and I am working on the implementation and programming of a 6502 with a RAM in a Spartan2 FPGA. I have implementated the RAM, the 6502 and a rs232 module to load the RAM from my computer using the HyperTerminal, but I don´t know programming the 6502 and I can´t test what I have done. I would like if someone could tell me who I can test it. Thank you.

You'll need some kind of ROM to store a minimal boot-loader that will enable you to load your "test code" into RAM. When you say an "rs232 module", does it emulate a 6551 type serial interface, or something else?

Check in the source code repository, under I/O techniques for Ross Archer's Intel HEX downloader. There is also an XMODEM file transfer program there that I wrote. These would be a good place to start.

On a side note, I'd be interested in seeing the code for your FPGA, as I'd like to design a small SBC using FPGA technology.

Daryl
http://65c02.tripod.com/

You could always try running my EhBASIC interpreter on it. It's been used to test 6502 implementations before and uses most instructions and address modes at some point.

It's also ideal for a 6502 with a serial port.

You'll find it here..

http://members.lycos.co.uk/leeedavison/6502/ehbasic/index.html

Tha latest version is fairly free of undocumented features.

Lee.