Programming of EP2C20F484C6N & EP2C50F672C8N - Both from the Cyclone II family

Hi,

In my workplace, I have inherited (need to support and develop) a product that uses two FPGA's (EP2C20F484C6N & EP2C50F672C8N).

This product and it's IP was designed by another manufacturer >10 Years ago.

We have purchased this product and it's IP (schematics, Altium files, source code) and now I need to do some mods to the firmware. I believe I have the source code?

The original manufacturer/designer has now gone out of business.

Unfortunately, I have never worked with FPGA's before. I have significant experience with other embedded devices (Zilog, Atmel Microchip, TI) and compilers, languages (ASM, C, Pascal) etc.

At the moment, we program the devices from a command line script and a USB-Blaster (ten pin header).

Where do I start?

Is there an IDE (Quartus Lite ??) on the Intel website that I should use and if so what version?

Thank you for any help.

Neil.