[Coco] CoCo bitbanger does 115200 bps !

[Roger Taylor]

Hear ye, Hear ye!

I'm proud to announce that the same exact code that I wrote for doing 57600 
bps communications over the bitbanger port yields *115200 bps* on a CoCo 3 
(or any CoCo with a 68B21) when the clock speed is doubled !!  Yes, it was 
that easy.  Ofcourse, nothing at all about the process is easy, but 
doubling the bps rate was a matter of just doubling the CoCo's clock 
rate... but a 2mhz-rated PIA is required which meant the CoCo 3.

I just confirmed quite a few error-free transmissions from the PC to the 
CoCo for displaying on the screen, and boy does it arrive fast and look 
good!  I'm using a laptop and a desktop PC both to transmit in my tests, 
and I'll be adding more sending devices to the list as soon as I can for 
more testing.

I'm using 100% 6809 code with no hardware modifications whatsoever to any 
CoCo.  We're talking original CoCo, original bitbanger port, original CPU, 
original 6821 PIA,.. you get the point!

Any comments?  :)





-- 
Roger Taylor