[Coco] Kip's Single Board Computer

[RETRO Innovations]

On 9/19/2015 9:40 AM, Pere wrote:
> Hi Jim,
> don't shoot if this doesn't make sense ...
> Comparing Sarle's board to the connections you say, there are some 
> differences:
> - The capacitor for 8MHz are just 15pF (not a big difference)
Yep, the selection of crystal caps can be an art, but I also tried an 
oscillator to eliminate that.
> - Reset is connected via 2K2 instead of 10K
On the test baord I am using right now, it's 10K
> - The others are tied together right to the +5V bus (apparently no 
> R's) you talk about 10K
> - In the power supply he has added two capacitors:
> 100nF and 100uF
There is a large cap on Kip's board that should suffice for power 
smoothing, and each IC has a decoupling cap.  But, my test boar dhas a 
large cap as well
>
> I can't figure what the result of these changes could be ... you know  
> a lot more on hardware.
Well, let's not be hasty, as I can't get a 30 year old CPU design to run 
:-)  At this point, I am assuming I've somehow toasted my CPUs or have 
some simple wiring issue, and I am awaiting another to successfully 
bring up the board (or a test board).

Jim