Natami and FPGAArcade

[freqmax]

I think any joint venture is dependent on what license (GPL?) that will be used. Also I have a gut feeling that fpgaarcade will be out faster and cost less than NatAmi.

[freqmax]

I just read the thread "What is the max RAM on an A2500 and what determines it?". It should be possible to create an Zorro expansion slot card to fit those extra i/o pins. Would be an incredible fun thing to test physical expansion cards on a FPGA board
A an 100 ohm resistor in series should let the protection diodes of the FPGA handle the 5V -> 3.3V conversion. And 3.3V to 5V can be handled directly due compatible levels. The powersupply and other stuff should be straightforward.

What's up with C64 SID?

[freqmax]

AJCopland, Where are these "test cases for the cpu simulation" ..?

Test programs to verify 68020 compatibility would be great. They can be built with existing computers without access to FPGA hardware or skills.

Softcore MMU-68841 and FPU-68881 would be great for unix.

[freqmax]

As for SID cloning. This seems to be the most serious:

http://en.wikipedia.org/wiki/MOS_Technology_SID#Hardware_reimplementations

"The PhoenixSID 65X81 project (2006) aimed to faithfully create the SID sound using modern hardware. The workings of a SID chip were recreated on an FPGA, based on interviews with the SID's creator, original datasheets, and comparisons with real SID chips. It was distinguished from similar attempts by its use of real analog circuitry instead of emulation for the legendary SID filter. However, the project was discontinued, because George Pantazopoulos, who was the head of this project, died on April 23, 2007, at the age of 29."

[freqmax]

Now that he's dead it maybe it can be useful to release any code such that others may continue where he didn't finish?

Btw, why did he die?, he was way to young to die from natural causes.