[Coco] DriveWire problem

Steven Hirsch snhirsch at gmail.com
Mon Feb 15 07:21:56 EST 2016

On Mon, 15 Feb 2016, Tormod Volden wrote:

> On Mon, Feb 15, 2016 at 3:40 AM, Steven Hirsch <snhirsch at gmail.com> wrote:
>> On Sun, 14 Feb 2016, Aaron Wolfe wrote:
>>> On Sun, Feb 14, 2016 at 5:07 PM, Steven Hirsch <snhirsch at gmail.com> wrote:
>>> Some usb-serial adapters have settings that cause some number of bytes to
>>> be queued up before they are delivered to the computer.  There is usually
>>> a
>>> timeout where even a single byte will eventually get delivered, but with
>>> just the wrong settings you could probably get this to happen even if all
>>> the bytes are transmitted perfectly by the coco.  That, or any other kind
>>> of serial port issue might be involved.  If you can verify the serial port
>>> and cabling works fine that would be a good thing to do.
>> Ugh.  I suppose it's possible that my trusty FTDI USB/Serial adapter has
>> developed problems.

> I have heard about issues with FTDI usb-serial adapters on Linux where
> single bytes are "held back" or doesn't make it to the wire in time
> [1]. I'd suggest trying another adapter.

This adapter had worked at one point in time, but it's certainly possible 
that something headed southward.  The first thing I plan to try is 
connecting to the DW server with a shorter cable.  I currently have a 
5-foot DIN - DB9 cable extended with a 10-foot serial extension.  As Aaron 
mentioned, that may be a cause of problems at 115k baud.


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