[Coco] 6 Chip ^809 Computer -> Kipper SBC

[Kip Koon]

Hi Salvador,
I used a cable with the RS-232 DB9 female connector on since I had an old laptop with a 9-pin serial port on it.  The USB2TTL cable is an interesting idea and simple to implement.  The header can easily be added.  One point to mention concerning the cable in the link you provided.  No !RTS lead exists so no flow control is possible.  Another cable will need to be found.  I'll go ahead and put a 5 pin header on the Kipper SBC tonight.  I think I'm going to start back using Kipper SBC v1, add the 5 pin USB2TTL header, add the 74LS138 to further decode the $A000-$BFFF I/O address area, then see what else I wish to do.  

Kip Koon
computerdoc at sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon



-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Salvador Garcia
Sent: Wednesday, March 11, 2015 7:45 PM
To: coco at maltedmedia.com
Subject: Re: [Coco] 6 Chip ^809 Computer -> Kipper SBC

Regarding the missing chip for the RS232 port.


I read Grant's page and if I understood correctly, this chip (plus 5 caps) is optional if a USB2TTL cable is used and connected directly to the 68B50's TX/RXDATA and /RTS pins. If that is correct then perhaps a good idea is to at least provide the thru holes for a five pin header so that a cable such as this one http://www.adafruit.com/products/954 can be connected directly to the board.


Also, regarding the possible inclusion of the KB/video interface, I would include it as part of the SBC board if there was enough space assuming that the original SBC PCB size is kept. As long as the real estate is there, might as well populate it with whatever could be useful. Since the board's functionality is not affected if this interface is not present, any one that wishes to save a few dollars and does not necessarily want/need this interface can just leave the reserved area void of components. Personally I would probably like both options: The serial (I would use the USB2TTL option) and the KB/video interface just for flexibility if and when it is needed.


Salvador




-----Original Message-----
From: Al Hartman <alhartman6 at optonline.net>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Wed, Mar 11, 2015 1:21 pm
Subject: Re: [Coco] 6 Chip ^809 Computer -> Kipper SBC


The flow control was meant to make the loading of software via the serial

interface more reliable and speedy.

Instead of pausing after each line, the
SBC could control the flow of
incoming data.

-[ Al ]-

-----Original
Message-----
From: Kip Koon

Hi Guys,

The 6 Chip 6809 Computer is now called
the Kipper SBC.

The current version of the 6 Chip 6809 Computer is now called Kipper SBC v1.


Kipper SBC v1.1 now has the 74LS04N and resister to control RTS on the
RS-232 port per Grant Searle's instructions.

Now I will start designing
the Terminal and Keyboard PCB.  I originally envisioned a multi-PCB Kipper computer.  I'm not sure yet if this will be an add on PCB or be put on the Kipper SBC PCB itself so off to Eagle Pro I go.
:)



Kip
Koon

<mailto:computerdoc at sc.rr.com>
computerdoc at sc.rr.com

<http://www.cocopedia.com/wiki/index.php/Kip_Koon>
http://www.cocopedia.com/wiki/index.php/Kip_Koon






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