[Coco] RS DOS RS232 application?

[Dave Philipsen]

Have you compared the pshs/u puls/u instructions for moving data quickly?

Dave


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
> corresponds to the megaread times I was able to get from myram, of 11
> seconds for a megabyte on a 6309, and just over 13 seconds on a 6809,
> each using the fastest way to move data that exists on those 2
> processors. For the 6809, thats (after the transfer is setup) ldd,x++;
> std, y++, or for the 6309, ldq ,x++;stq ,y++ (IIRC).
>> --
>> RETRO Innovations, Contemporary Gear for Classic Systems
>> www.go4retro.com
>> store.go4retro.com
>
> Cheers, Gene Heskett