[Coco] other use for fpga rgb converter

[Zippster]

Excellent Luis,

The 6847 is in dire need of a decent output solution.

Thanks for doing this.

- Ed


> On Oct 28, 2014, at 1:29 PM, Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com> wrote:
> 
> The boards are easy to assembly using protoboard, but you would like
> something from OSH Park to be good-looking with the altera, also for the
> durability and noise reduction. I will try to make a design that would look
> nice one top of it :)
> 
> You can order your altera de0-nano. I'm finishing the design, I need to
> make some tests with the Coco2: YEAH! I want to make the component video to
> vga as well from the 6847 :D
> 
> If you really want to contribute: Soon I will release the eagle files and
> then you can order it from osh park. The minimum batch is 3 boards and I
> just need one for me. It will probably cost no more than 20 dollars per PCB.
> 
> Felipe.
> 
> 
> 
> 
> Luis Felipe Antoniosi
> 
> 
> 
> On Tue, Oct 28, 2014 at 2:11 PM, Steven Hirsch <snhirsch at gmail.com> wrote:
> 
>> On Tue, 28 Oct 2014, Luis Antoniosi (CoCoDemus) wrote:
>> 
>> I'm finishing the board in eagle to be used with the Altera DE0-Nano. It
>>> will include a RCA for the composite video, a coco3 rgb connector and a
>>> generic RGB IN for CSync in an VGA connector. So if your computer has
>>> separate hsync/vsync you should use the COCO3 port, if it has CSync you
>>> use
>>> the RGB IN. And the RCA for Apple ii.
>>> 
>>> I won't be able to use cheap altera boards from ebay because they don't
>>> have a 16-bit SDRAM.
>>> 
>>> I am very limited on the choice of alteras, it must be Altera Cyclone IV.
>>> I
>>> tried compiling for Altera II or III but it was a no-go for the PLL.
>>> Cannot
>>> change the PLL speed. So I must stick the the cyclone IV. The cheapest
>>> cyclone IV on ebay costs around 30 dollars. Adding a SDRAM would increase
>>> the price to 10 dollars (plus the work soldering these small legs).
>>> 
>>> For 79 you buy an DE0 Nano development. Also it has way more quality. Also
>>> my PCB won't have any SMD so it can be assembled by any one with a cheap
>>> soldering iron.
>>> 
>> 
>> Doesn't bother me at all.  If I add up the money and time I've expended in
>> a fruitless effort at getting clean video conversion I could buy a dozen
>> DE0 boards - maybe more.
>> 
>> And honestly I don't want to expend money buying a board that would may
>>> not
>>> work, doing more prototypes, etc. I have already spent too much money on
>>> retro computing so now I'm very low profile.
>>> 
>> 
>> I would like to put my money where my mouth is and contribute towards your
>> development costs.  Anyone else want to join me in stepping up?
>> 
>> If you will allow me to do this, please contact me privately with a PayPal
>> address?
>> 
>> The problem with my board is that switching from one computer to another
>>> you need to fine tune the variable resistors. So it's not a plug and play
>>> solution, you should keep it for one computer.
>>> 
>> 
>> I plan to buy several if the results are anything like what you've showed
>> in your YouTube videos.
>> 
>> Once boards are available, I plan to talk at length about this on
>> comp.sys.apple2.  There's an avid community of A2 users facing the same
>> challenges as I am:  dying CRT monitors and/or insufficent space to set
>> them up.
>> 
>> I would need a help for any engineer with video expertise, how do I
>>> normalize different video voltages ?
>>> 
>> 
>> Gene Heskett has forgotten more about video than I could hope to know in
>> two lifetimes.
>> 
>> Should I use transistors ?
>>> 
>> 
>> On the inputs?  Probably a question for folks smarter than I (Gene?)
>> 
>> Steve
>> 
>> 
>> --
>> 
>> --
>> Coco mailing list
>> Coco at maltedmedia.com
>> https://pairlist5.pair.net/mailman/listinfo/coco
>> 
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco