[Coco] Kipper SBC v1 Update

[Tormod Volden]

On Sunday, March 15, 2015, Salvador Garcia wrote:

>
> Awk! That is so cheap and shipped from China!
>
>
> Regarding the comment by Joe regarding the USB interface onboard the
> Kipper SBC: I  was one of the people that mentioned the possibility of
> including this; however, just to clarify, my suggestion was to just include
> a header of sorts connecting to Gnd, Vcc, /RTS, TX and RX data as presented
> on Grant's original 6 chip 6809 SBC Web page. It would be the SBC's owner's
> responsibility to purchase the USB to TTL cable.
>
>
> Having said that another idea crossed my mind, but first a question: The
> eBay item referenced by RETRO Inn. has a five pin header. Does anyone know
> if the pin out is a standard? What if I buy another similar device, can I
> expect their 5 pin header to have the same pin out as this one? Or does
> each manufacturer have their own standard?
>

I can comment on this with my own experience and a lot of wasted time:

No, there is no standard pinout!

And you're never sure you'll get the same pinout as on the picture when you
order on eBay. And never count on getting the same model if you order twice.

Warning no 2: Stay away from pl2303 uarts.

And yes, I have also bought from "Alice" from the eBay link posted, who are
two Chinese brothers. Depending on which one takes your order, YMMV!

I use such uarts (but cp2102 based) for my Dragon Drivewire adapters, of
which I have manufactured quite a few, and bought a lot more uarts... I
ended up buying large lots (not eBay) and designing the PCB according to
what I received :)

.02$,
Tormod



> If there was a standard then perhaps the Kipper SBC could provide the
> through holes near the edge of the PCB and those who want can purchase one
> of these devices and install it there.
>
>
> I just found a serial USB convertor that I have laying about:
>
>
> https://drive.google.com/file/d/0BwHoDS_llfwSbk81SjBrWG16R2c/view
>
>
> Note that this one has 6 pins, an additional one for 3.3V. Also note that
> the converter came with its own flat cable and the female header connectors
> are separated, just as Kip describes, so I would install a male header 1x5
> row on the through holes and I would be set. I think the Kipper SBC is fine
> with the electronics on board now, but those through holes would really
> come in handy! :-) Salvador
>
>
> Big PS: One caveat though... Grant mentions that the 6 chip SBC can be
> powered from the USB port, but the power source is exclusive: Either it
> comes from the power supply or from the USB, but never both. In that case
> (sure, why not give Kip a heart attack) it would be wise to provide a 1x3
> header where a middle power to the PCB pin is shorted with one or the other
> ends where one goes to the DC in and the other to the USB 5V in. This way
> even if both power sources are connected there is no way the hapless Kipper
> SBC owner can do something horrible.
>
>
>
>
>
>
> -----Original Message-----
> From: RETRO Innovations <go4retro at go4retro.com <javascript:;>>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com
> <javascript:;>>
> Sent: Sat, Mar 14, 2015 4:28 pm
> Subject: Re: [Coco] Kipper SBC v1 Update
>
>
> On 3/14/2015 4:15 PM, Kip Koon wrote:
> > Hi Joe,
> > I've got a friend going over
> the design now.  I will see if the 5 pin header for a TTL - USB cable is
> easy to
> add.  I need to get a pin out for the TTL end of the cable or find one with
> separate female headers on each wire.
> Is this what you are talking
> about:
>
>
> http://www.ebay.com/itm/USB-To-RS232-TTL-PL2303HX-Auto-Converter-Module-Converter-Adapter-For-arduino-/251876195815?_trksid=p2054897.l4275
>
> These
> things are so cheap, I am thinking you should just not populate
> the RS232 and
> the MAX and the caps and just wire this in to the base
> board, as this is
> extremely cheap...
>
> Jim
>
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