[Coco] OS9 sc6551 driver with t2

[Dave Philipsen]

I may start doing some sleuthing to see if I can find other versions of 
sc6551 floating around...



On 4/11/2017 5:59 PM, Dave Philipsen wrote:
> Mmmmmm....I don't think the 6502 has anything to do with the serial 
> port.  Maybe the Becker port but I have that switched off.
>
> Dave
>
>
>
> On 4/11/2017 5:55 PM, Mark Marlette wrote:
>> Dave,
>> I haven't had my CoCoFPGA out for a long time.
>> I **thought** Gary had a 12MHZ 6502 running all the IO. ????
>> Regards, Mark Marlette
>>   http://www.cloud9tech.com
>> mark at cloud9tech.com
>> mark at gamecamaddict.com
>>
>>        From: Dave Philipsen <dave at davebiz.com>
>>   To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
>>   Sent: Tuesday, April 11, 2017 5:44 PM
>>   Subject: Re: [Coco] OS9 sc6551 driver with t2
>>     Well, this is a 25 MHz 6809 so the capabilities are quite 
>> increased as
>> far as the CPU's ability to suck the data from the UART.  And, it's not
>> a real 6551 either.  So it's possible it could be a problem with the
>> hardware but based upon it's actions I'm more inclined to think it's
>> something in the driver.  As I recall, the problems continued even when
>> I slowed it down to 9600.
>>
>> Dave
>>
>>
>> On 4/11/2017 5:25 PM, Tim Fadden wrote:
>>> On 4/11/2017 1:19 PM, Dave Philipsen wrote:
>>>> I'm creating an un-tethered NitrOS9 setup with my CoCo3FPGA. So it
>>>> now boots from the SD card and I've stripped drivers and descriptors
>>>> associated with DW but I added the sc6551 and t2 modules so I can use
>>>> the serial port to transfer a few files back & forth from my laptop
>>>> now & then.  I found the drivers in the NITROS9 subdirectory and I
>>>> believe they are from an 'official' distribution. So I'm using
>>>> Supercomm on the CoCo side and Terraterm on the PC side. Bitrate is
>>>> 19.2k.  Most x/ymodem transfers work ok with smaller files but now
>>>> and then I get an error that will not resolve.  Larger files over
>>>> 100k or so are almost impossible as they will almost surely fail
>>>> before finishing.  Turns out that the CoCo3FPGA stops receiving.  I
>>>> can exit Supercomm and then restart it and everything works again.
>>>> This leads me to believe it's a driver problem as simply closing the
>>>> path and re-opening gets it working again for awhile.  Does anyone
>>>> have a similar or experience or an idea on what might be causing this?
>>>>
>>>> Dave
>>>>
>>> I am amazed you got 19.2k to work at all.  I have never been able to
>>> get more than 9600 out of the rs232pak, and for long transfers, in the
>>> megabytes only 4800 was reliable.
>>>
>>>
>>
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