[Coco] Kip's Single Board Computer

[Kip Koon]

Hi Everyone,

I apologize for not responding sooner as I have not been doing well.  Once I
saw and read all the emails and requests to help, thanks guys, here are PDFs
for the Kipper SBC v1 that Retro Innovations and I have been working on.

I guess looking at the same schematic for long periods of time is not good
for finding errors since I could not find any until recently.  Here are the
few errors I have noticed.

Looking at sheet 1 of the schematic, I noticed there is no capacitor across
the reset pushbutton hence no RC circuit to pull the reset pin low.  In the
next version, I will be using an MC340649 Voltage level Sensor in a TO-92
package built to properly reset microprocessors and microcontrollers.  

Second, though I studied the datasheet for the 6809 microprocessor carefully
to make sure I did not exceed maximum current limits on pins, I probably
should have put buffers between the cpu signals and the LEDs.  Buffers will
be included in the next design.  I'm sure there are other improvements that
could be done as well.  

There are numerous notes in the schematic, however, feel free to ask me or
Jim at Retro Innovations any questions you may have.  

In the folder Kipper SBC v1 in my dropbox are the schematics and board
layout with dimensions at the following link.

< https://www.dropbox.com/sh/lhpa2j2qy78wi1u/AADQENXcZltISTHB_6_IE5oYa?dl=0>

Everyone is welcome to chime in.  I'm looking forward to our collaboration.
I'd like to make this first version the best it can be for what it is
designed to do.  Thank you all in advance for your help.  Take care my
friends.

 

Kip Koon

computerdoc at sc.rr.com

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