[Coco] FPGA CoCos

[Dave Philipsen]

Another problem that I did not mention is in regard to Gary Becker's implementation of the CoCo 3 FPGA project on a DE1 board. Unfortunately, Terasic made a change midstream to the SRAM on the board so his project can only be used on the older boards. He doesn't release the source code so all we can do is wait and hope that he has a fix for those of us who have the newer version board.

Dave Philipsen

> On May 23, 2015, at 2:02 PM, Barry Nelson <barry.nelson at amobiledevice.com> wrote:
> 
> So, I am to understand that you have a fully working emulated CoCo 3 on a modern FPGA board? What is supported? Does sound work? What about graphics? What graphics modes are supported? Can I plug legacy joy sticks into it? Where can the files be obtained to program it? How dos disk access currently work?
> 
>> After about 3 hours of trial and error this amateur VHDL coder got it 
>> figured out! (I'm sure a more experienced person would have figured it 
>> out in no time)  A few very minor changes to Grant Searle's project  
>> (which was written for a pretty standard 128K x 8 SRAM) makes it work on 
>> the new DE1 board.  The 256K x 16 SRAM on the DE1 now looks like 512K x 
>> 8 to the Multicomp project and my MMU which works on another board with 
>> a 512K x 8 RAM now works on the DE1.
>> 
>> Next issue to tackle: make a file system to access the SD Card in FAT 16 
>> and eventually FAT32 formats.
> 
> 
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