[Coco] Grant Searles SBC

[Zippster]

Hmm, at this point I might write a quick assembly program that inits the serial chip and
just outputs one (known) character to it in a constant loop, burn that to a ROM,
and start probing address and data lines just to see if valid data is making it that far.

- Ed


> On May 6, 2015, at 9:27 PM, Bill Nobel <b_nobel at hotmail.com> wrote:
> 
> I am using tantalums on the charge pumps. and electrolytics currently for the decouplers. i can change the decouplers to tantalums as I have enough in stock.  I have a bunch of ceramics coming for the decouplers, as I had the same thought for that reason.
> 
> Bill Nobel
> 
>> On May 6, 2015, at 8:15 PM, Zippster <zippster278 at gmail.com> wrote:
>> 
>> I would normally go with .1uF ceramics, 1 per IC, perhaps 2 on  the CPU.
>> 1uF or slightly larger decoupling on the MAX232.
>> 
>> Are you using tantalum caps for the charge pumps on the MAX232?
>> Some versions can use ceramics as well.
>> 
>> - Ed
>> 
>> 
>>> On May 6, 2015, at 9:03 PM, Bill Nobel <b_nobel at hotmail.com> wrote:
>>> 
>>> Yes I do. I am use 1uf caps right now, should I use maybe .1uf instead?
>>> 
>>> Bill Nobel
>>> 
>>>> On May 6, 2015, at 8:00 PM, Zippster <zippster278 at gmail.com> wrote:
>>>> 
>>>> I would think you would be ok as far as bleed over, although you could try separating them a bit.
>>>> Breadboarding always makes me wonder if I’m getting reliable contact with everything.
>>>> 
>>>> Do you have decoupling caps on all the chips, including the MAX232?
>>>> 
>>>> - Ed
>>>> 
>> 
>> 
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