[Coco] RS DOS RS232 application?

[RETRO Innovations]

On 4/14/2016 7:58 PM, Gene Heskett wrote:
> On Thursday 14 April 2016 20:34:59 RETRO Innovations wrote:
>
>> On 4/14/2016 7:14 PM, Gene Heskett wrote:
>>> On Thursday 14 April 2016 19:58:35 RETRO Innovations wrote:
>>>> I would like to test out a mod to my RS232 pak to bring it up to
>>>> 230kbps.  Is there a simple app around that has source so I can
>>>> modify it to do 230kbps on my rs232 pak and test?  Or,
>>>> alternatively, is there a simple terminal that I can run to test
>>>> out the various existing bps rates?
>>>>
>>>>
>>>> Jim
>>> Unless you have huge buffers, big enough to contain the whole
>>> transmission, the coco cannot move more than about 90k a second.
>> That's fine.  That's approximately 900kbps, far more than I need.
>>
>> Any response for my question?
>>
>> Jim
> No, not from a position of authority after having forgotten the kilobaud
> to kilobyte translation that badly.  I'd fire up the scope and check 2
> things, 1 being that the output rise and fall times are no more than 10%
> of the bit time, and which swing from -7 to +7 volts or more, and if the
> scope is well calibrated, do you see bit times that correspond to 230
> kilobaud, a hair over 4.17 u-s per bit?
>
> Cheers, Gene Heskett
I'm confident the UART (6551A) will be fine in that area (as I regularly 
use the same circuit on the 65XX side of things, I was rather hoping to 
see it work at a higher level (i.e. an app to show at CocoFEST)

Jim


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