[Coco] Grant Searles SBC

[Kip Koon]

Hi Bill,
I apologize for not being on the email list lately.  Being back home, I've had to take care of life issues as well as play just a little bit with my new toy.  :)  I'll be glad to help you.  I've had similar problems when I breadboarded Grant's 6 Chip 6809 Computer (Simple6809) 4 years ago, so I have a pretty good idea of the anguish, blood, sweat and tears it takes to learn digital circuits on your own.  :)  Fortunately for me, everything was running properly except the serial port when I did it.  
Since then however, I have acquired an FTDI 24 pin footprint PCB version of their USB chip which I too would eventually like to use.  Then I could have an additional choice for future versions of the Kipper SBC.  
By the way, which FTDI chip or PCB are you trying to use?  
Keep in touch.  We all will help you figure this thing out!  Have Fun!  Take care my friend.

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 Bill Nobel
> Sent: Wednesday, May 06, 2015 7:16 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: [Coco] Grant Searles SBC
> 
> Hi guys.  This is a shout out to the Hardware Experts out there.  I am trying to build this unit on a breadboard and am having some
> issues.  I am following the circuit to a tee.  Powering up I get 1.843 mhz on the E & Q lines R/W is working.  But sometimes when I hit
> reset my BA line goes high throwing CPU into HALT state even though my HALT is tied High.  Also on the terminal window I am getting
> nothing but garbage @ 115200 baud.  The one difference to the circuit I am using a FTDI instead of the 9 pin serial plug.  I verified the
> FTDI by connecting to a old desktop pc using Hyperterm so the chip is working.  But on the SBC I get nothing.  I even went to the
> extent of swapping out all the chips and verified by hand the Eprom code to see if it Burned properly.
> 
>  Any suggestions or help would be appreciated.
> 
> Bill Nobel
> 
> 
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