[Coco] Serial Port file transfers

Jim Hickle jlhickle at yahoo.com
Fri Nov 10 16:32:31 EST 2006

"L. Curtis Boyle" <curtisboyle at sasktel.net> wrote: On Mon, 06 Nov 2006 00:30:52 -0600, Gene Heskett  

> On Sunday 05 November 2006 23:03, Jim Hickle wrote:
>> What sort of speeds should I be expecting from a 512k CoCo running
>> NitrOS9, with an RS-232 pack connected to a Linux system's serial port?
>> I'm trying to transfer files and it's taking forever using floppies and
>> the PCDos program.

> Years ago now, I was using an amiga-2000-040 and Olaf Barthels term4.7 to
> measure that.  I was getting around 740 cps with the interfaces set for
> 9600 on a nitros9-1.15 system, and about 430 cps with a stock 512k coco3.
> This was using the auto-trigger of rz/sz-3.36 with supercom-2.3 for the
> term program on the coco3's.  Using the 7-wire protocol for flow control,
> not xon/xoff.

     This was using Nitros9 as originally intended on a 6309 chip... I  
don't know if Jim is using a 6809 or 6309 chip in his scenario. I know I  
used to get about 700-800 CPS with a 9600 connection with RZ/SZ (which  
really needs a rewrite to use proper buffering to speed it up), and with a  
38400 connection (Eliminator from Frank Hogg Labs), I could get 2000+ cps  
with Ymodem/Ymodem batch. If you have the Randy RS-232 pak, then about  
1700-1800 cps would probably be the max with X/Ymodem (x is slower, since  
it has more overhead) using a decent term program like Supercomm or  
OSTerm. Once again, running the 6809 version of Nitros9 might be a bit  
slower; I am basing on the 6309 version.

I have a stock 512k 6809 CoCo 3 running Nitros9  v 3.2.6.
Using X-Modem, with the port set at 4800 bps, downloads to the coco are 380 cps.  With the port set to 9600 bps, downloads drop to 188 cps.

I found my old SACIA disk, which keeps giving me CRC errors when I try to read it.  Haven't put SACIA into a bootfile yet because I've been fighting a bootlist order problem whilst adding a ram disk. 

(OOOO! I just remembered that the SACIA driver and a t2 descriptor can be loaded AFTER system boot. )

Ever the optimist, I tried 'xmode /t2 par=2 xtp=8' like in the SACIA instructions, but it didn't help.

I shall keep trying.

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