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

[L. Curtis Boyle]

On Tue, 26 Sep 2006 14:43:14 -0600, Gene Heskett  
<gene.heskett at verizon.net> wrote:

> 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.
>
    Back in Nitros9 1.2x days, we were getting around 1300 cps using  
XYMODEM in Ymodem mode (or 1K-Xmodem). So, it can definately do faster  
than 9600 baud... and this was saving to a hard drive.


-- 
L. Curtis Boyle