[Coco] [Color Computer] Re: Create NitrOS9 L1 boot disk for Dragon with F...

[Gene Heskett]

On Tuesday 26 September 2006 13:28, Phill Harvey-Smith wrote:
>> On Tuesday 26 September 2006 11:47, Chen Herzog wrote:
>>> Since on the Dragon (at least the Tano Dragon) the 6809 is socketed,
>>> upgrading to a 6309 should be a snap.
>
>Yep All the Dragons I have ever seen have the 6809 & 74LS783 socketed,
>some of them also have one or both of the roms socketed too. Alas the
>RAM is normally soldered in, so making 32->64 upgrades more dificult.
>Well compared to the CoCo 1 anyway which had sockets & jumpers.
>
>>> And with the Dragon's true serial port, I wonder what would be the
>>> communication speed that could be achieved under NitrOS9?
>
>The Dragon uses a 6551 serial chip for it's serial port which has a top
>speed of 19200baud, according to the data sheet :)

The 6551 will do faster that that, by a fair margin.  I have a rs-232 pack 
around here someplace, with a piggy-back kit in it for a second port, and 
a different crystal, all of which runs at 31250, the midi speed.  I got 
the impression that it could go at 56k if the coco could keep up.  I used 
it as the second channel of output from umuse3, which was happy as can be 
sending one set of voices to the bit-banger, and the other to that 
converted rs232 pack.  It was one way to solve the very limited polyphony 
of the cheap keyboards I have.

>The ROM routines only allow you to set it to 9600, but if you set it
>directly by writing to the chip, it will work at 19200, even with the
>ROM routines.
>
>Cheers.
>
>Phill.
>
>--
>Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !
>
>"You can twist perceptions, but reality won't budge" -- Rush.

-- 
Cheers, Gene
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Copyright 2006 by Maurice Eugene Heskett, all rights reserved.