[Coco] OS9 sc6551 driver with t2

[David Ladd]

On Tue, Apr 11, 2017 at 5:25 PM, Tim Fadden <t.fadden at cox.net> 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.


​Tim, for the real RS232 Deluxe Pak there were patches to fix the hardware
flow control.  As far as the CoCo3FPGA project goes some of these fixes may
already been applied in the FPGA coding or what ever is doing the RS232
workload. :)  I am sure one of the people that knows how the FPGA tech
works can describe that process. :)​



>
>
>
> --
> Tim Fadden
> "Hey Schmidt, don't forget about the six P's.
> Proper Preparation Prevents Piss-Poor Performance!"
>
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​

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