[Coco] OS9 sc6551 driver with t2

[Dave Philipsen]

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.
>
>