[Coco] Kipper SBC v1 Update

[Dave Philipsen]

Actually, I assume that the clock circuit of the 6809 will run at 7.3728 
MHz but the clock is divided by four internally and so you'll end up 
with a 1.8432 MHz clock for the CPU and the 6850 UART.   The 68A50 is 
rated for a maximum of 1.5 MHz so it would have to be 'overclocked' by 
about 23%.  It's hard to say for sure whether the 68A50s will work or 
not.  I've seen many chips like this run faster than advertised without 
a problem but I've also seen others that wouldn't.

Unfortunately, even though I live here in Illinois I won't be able to 
attend the CoCoFest as I already have obligations that can't be changed 
this weekend.  I'm about 2 hours south of Chicago on I-55 so if you're 
on your way and want to swing by and pick them up you're more than welcome.

Dave


On 4/23/2015 5:53 PM, Kip Koon wrote:
> Hi Dave,
> Thank you for offering them to borrow.  They would have to operate at 7.3728MHZ.  If they work, that would be great.  You can bring them and we will see how they do.  Thank you very much.
>
> 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 Dave Philipsen
>> Sent: Wednesday, April 22, 2015 10:10 PM
>> To: CoCoList for Color Computer Enthusiasts
>> Subject: Re: [Coco] Kipper SBC v1 Update
>>
>> Hi, Kip.  I have 5 MC68A50P chips that you could borrow.  They aren't rated a 2 MHz but could probably be 'pushed' without a
>> problem.  I was digging through a bunch of old stuff tonight when I ran across them.
>> They are brand-new in the tube.  1983 date code. Let me know if they would do you any good.
>>
>> Dave Philipsen
>>
>> P.S.  Also found a GIME chip brand-new in the Tandy package...forgot I even had it!
>>
>>
>> On 4/21/2015 8:48 PM, Kip Koon wrote:
>>> Hi Jim and All,
>>> I have received one order of parts today.  Two other orders are on the way.  I have 10 HD63C09P chips and I have 2 MC68B09P chips
>> and I have 2 MC68B50P chips.  It's the MC68B50P chips that are on a rush order from China.  Whoever has MC68B50P chips that are
>> willing for them to be borrowed I will of course reimburse you with chips from my China order.  My supplier sent me 1uF mono caps
>> that are 3/8" long rectangular caps, but I needed tiny 1uF caps about1/8" long so it will be interesting to see how we fit these big caps
>> on to the PCB beside the MAX232 chip.  I'll keep you guys posted on the arrival of the rest of the parts.  I'll have to leave no later than
>> Thursday which if that happens will require me to drive straight through.  I'm glad my brother will be there to keep me awake!  :)
>> More news to come...
>>> 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 RETRO Innovations
>>>> Sent: Tuesday, April 21, 2015 9:51 AM
>>>> To: CoCoList for Color Computer Enthusiasts
>>>> Subject: Re: [Coco] Kipper SBC v1 Update
>>>>
>>>> On 4/21/2015 1:55 AM, Kip Koon wrote:
>>>>> Hi Jim,
>>>>> I have ordered enough parts for all 10 boards, however I am concerned about what day they will arrive.  Some parts were shipped
>>>> Saturday, other parts were shipped Monday and I have a rush order for the 68B50 ACIA chips from China which are scheduled to
>> arrive
>>>> Wednesday at the earliest.  I really pray they are all here by Wednesday preferably or Thursday at the very latest.
>>>> Did you get sockets?  I ask because I have an open DigiKey order I need to commit tonight for delivery  timing, but can add items
>> until
>>>> 8PM central.
>>>>
>>>> Maybe there are folks on the list who can "spare" a 68B50 and 6809/6309 IC or two for the show, in case the ones you ordered do
>> not
>>>> arrive in time?
>>>>
>>>> I *think* I have a 6850 here, but not sure.
>>>>
>>>> JIm
>>>>
>>>>
>>>>
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>>
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