[Coco] Retro computer, somewhat similar to CC1/MC-10.

[Phill Harvey-Smith]

jdaggett at gate.net wrote:
> Frank
> 
> I would think that the microcontroller was something like a PIC, SX or that 
> type of microcontroller. 

Having a look at some of their other products, It may well be a PIC, as 
I can see the Microchip logo on (for example the mouse->serial thingy, 
which only seems to have one 8 pin chip).

>		The heart of the board is the ezVGA chip. With its 
> cost of $25 and some comments I have researched this may very well be a 
> Xilinx XC9500 series CPLD. 

Yep and looking at the VGA chip pinout and comparing it with the Xilinx 
data sheet pins 28,29,30 and 59 are marked no connect on the VGA, 
supprisingly those are the programming pins on the Xilinx data sheet, 
power pins seem  to match too....

Ok, I now wish they sold it as a soft core, as I already have some 
Xilinx chips....

 >                        A simple VGA willfit in a Xilinx XC9572 and

Yep infact one of the first things I did with a CPLD, was to get it to 
generate coloured boxes on the VGA screen, just with internal logic and 
counters, no memory interface tho.

Cheers.

Phill.

-- 
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.