Re: FPGATED

On 7/29/2016 11:31 AM, Terry Raymond wrote:
> Hi guys,
> With the DTV it didnt have function keys could that be added in, most 
> software
> used function keys, that is if youve hacked in your keyboard and IEC!
Function keys work on the DTV, with the exception of f7, I think. It's  
not a function of lack of capability, it was just a bug that was no 
doubt missed (or known and ignored) because keyboard support was not a 
requirement for the game machine.
> Terry Raymond
>
> On Friday, July 29, 2016, Robin Harbron <macbeth@tbaytel.net 
> <mailto:macbeth@tbaytel.net>> wrote:
>
>     On 2016-07-29 11:58 AM, silverdr@wfmh.org.pl wrote:
>
>             I'm trying to find the schematic to the 64DTV, but if it
>             uses an ASIC, that part could be integrated on that ASIC
>             and wouldn't help if you want to emulate TED with an FPGA.
>
>         I don't know the final device's arch but AFAIR (or tend to
>         believe) the first one was done with FPGA and that included
>         the VIC (?) And Jeri can possibly be still reached to ask (?)
>         in case some things are not clear.
>
>
>     The two revisions of C64DTV prototypes were FPGA boards, but once
>     the FPGA design was finalized, it was made into an ASIC for mass
>     production.  And yes, it was a single-chip re-implementation of
>     the C64, so the VIC, SID, CIAs, 6510, etc. were all included in
>     the single ASIC.
>
The code was a mix of schematic capture, VHDL, and Verilog, as I recall, 
but the ASIC vendor could only convert CHDL to netlists.  I seem to 
recall Jeri doing a lot of rewriting at the very end to get all of the 
project into VHDL so it could be converted to an ASIC.

That said, the entire design was digital, so she managed to coax 
composite out of the digital pins.  I suspect that some of the resistors 
on the PCB make up an R2R or similar.

Jim



>
>     Robin.
>
>           Message was sent through the cbm-hackers mailing list
>


-- 
Jim Brain
brain@jbrain.com
www.jbrain.com



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