[GreenKeys] Volpe board help...

[epvgk at limpoc.com]

On Tue, Sep 18, 2018 at 08:28:33PM -0400, Duncan Brown wrote:
> The AWA Museum would be interested in a couple more boards. But if there is
> going to be another run of your boards, here is one bug in the "Autoprint"
> function that should be looked into:


Will check it out!  The autoprint thing was definitely a last-minute hack. 
Iirc detecting a break is just more than a character time passing without
correct framing (ie, start bit, 5 1/0 bit times, stop bit) in the receive
state machine but it's been a while. Might just be a matter of something
not getting reset correctly after the autoprint. 



eric

> 
> On 23-Dec-16 17:26, Duncan Brown wrote:
> >Eric,
> >
> >Thanks for designing and making available the USB-TTY adapter!.
> >
> >I have been using one at the AWA Museum for the last 6 months, using the
> >Autoprint feature to print out a stored  welcome message when a M15 is
> >turned on. (The USB-TTY is always powered up. When the M15 and its loop
> >supply are turned on, the USB-TTY sees the zero to loop current transition
> >as a "Break" and sends the stored message.)
> >
> >The only problem is that after the message ends, if you start typing, or
> >send a tape, the USB-TTY Autoprint gets triggered for some reason garbling
> >everything.  I have not been able to identify what triggers the USB-TTY to
> >think that there has been a "Break". I thought it might be characters with
> >a lot of spaces in them, but sending repeated "E", "T", "Space", Blank, 
> >etc does not trigger the USB-TTY.  It seems like it is just some random
> >typing that will trigger it. I have tried it on two different M15s with
> >the same result.
> >
> >I don't know how you are sensing a "Break", perhaps you just need a longer
> >sample of no loop current. Not a big problem, I'll just have to switch in
> >the USB-TTY when I want it to send the stored message. But thought you
> >would want to know about it for the next version.
> >
> >Thanks & have fun,
> >
> >Duncan Brown, K2OEQ
> >USASA  31J30
> >
> >Antique Wireless Association Museum Asst. Curator, Commercial Equipment
> >(also Chief TTY operator & repairman)
> >http://www.antiquewireless.org/
> 
> 
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