[Coco] altera DE1 board

Steven Hirsch snhirsch at gmail.com
Tue Oct 19 21:31:25 EDT 2010

On Tue, 19 Oct 2010, Frank Pittel wrote:

> I needed a coco3 rom so I found the mess roms and picked one of the *.zip files
> for the coco3 and used the de1 console software to write the coco3.rom file to
> flash. I then power cycled the board and reloaded the *fpga*.sof file. With the
> exception of the black screen I get the same results that I got without the coco3
> rom loaded in flash.
> Am I doing something wrong, missing a step or two, etc? I think I'm going to try
> using an older fpga file and see if that helps.

I feel your pain.  There were a couple of minor details that are easy to 
miss.  Took me days to get it going.

One major stumbling block:  The numbering of the slide switches and 
momentary buttons is bass-ackwards to my Western sensibilities; running 
from right --> left.  Beyond that, remember that they start from _zero_, 
not one.  The little identifiers on the silkscreening are/were too small 
for me to see with my late-50s eyesight.

I spent days flipping on and off what I thought was SW7.  It was actually 
SW2.  Once the light went on, I was soon off and running.

Check the list archives for a looongggg thread featuring yours truly. 
There may be something valuable to be gleaned.  Or, there may only be the 
impression that I am great at confusing myself :-).



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