[Coco] Kipper SBC v1 Update

[Salvador Garcia]

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?


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>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
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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