[Coco] FPGA CoCo's

[Dave Philipsen]

Sure, I can release the source.  It needs to be cleaned up a bit first 
and I'm not real sure about the MS Basic that Grant packaged with it.  
I'm sure it must be copyrighted and I don't want to get in trouble for 
posting it somewhere.  It's nice....the source code with comments comes 
from the BASIC unraveled series.  He just pulled out the code for sound, 
cassette, graphics, joysticks, etc.  I'll try to get it ready soon but 
remind me again if you don't hear from me about it soon.  If nothing 
else I can just zip it and send it to you directly via email.

Dave


On 5/22/2015 8:19 AM, Gustavo Ranaur Schoenaker wrote:
> Excelent Dave. I have also a DE1, that won´t probably work with CoCoFPGA.
> (That´s why I left it after taking over the world. :-))
>
> Can you release the source? That's a good project to work on!
>
> Regards,
>
> On Fri, May 22, 2015 at 4:39 AM, Dave Philipsen <dave at davebiz.com> wrote:
>
>>
>> On 5/21/2015 9:30 PM, Mark McDougall wrote:
>>
>>> On 22/05/2015 11:10 AM, Dave Philipsen wrote:
>>>
>>>   Well, that's good to know. It's a shame that Altera changed the memory
>>>> and
>>>> couldn't find a chip that is at least compatible with the old one.
>>>>
>>> FTR the board is produced by TerASIC, not Altera.
>>>
>> True.  That's what I should have said.
>>
>>>   Unfortunately, Gary doesn't publish the source and I'm not sure he has
>>>> time
>>>> to keep up with it (although I don't know him personally nor have I
>>>> communicated with him).
>>>>
>>> He did publish some early source, though I don't recall if that was for
>>> the DE1 or not. I ported an early version of his Xilinx-based project to
>>> the DE1 (older board) but that's very outdated now.
>>>
>>>   Anyway, it will be handy for other things IF I can get this stinkin SRAM
>>>> figured out.  It doesn't behave like most standard SRAMs and I frankly
>>>> don't
>>>> have that much experience with VHDL to figure it out.
>>>>
>>> Yeah I'm not really sure what the issue is as I have an older board.
>>>
>> 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.
>>
>>
>>> Regards,
>>>
>>>
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