[Coco] Kip's Single Board Computer

Sat Sep 19 02:09:38 EDT 2015

Yes, well I've never sold one to the 'public' before.  I'll have a look 
and see what seems reasonable.

Dave

On 9/19/2015 1:03 AM, Kip Koon wrote:
> Hi Dave,
> An already built one is fine.  I just did not know how much that one would be.
>
> 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: Saturday, September 19, 2015 1:08 AM
>> To: CoCoList for Color Computer Enthusiasts
>> Subject: Re: [Coco] Kip's Single Board Computer
>>
>> Kip, would you rather build one from scratch or just get one already built?  I have a number of them already built that I could send out.
>> I'll try to write up a little documentation for it.  I also have an assembler and a monitor for it.  For some things it can be faster than a
>> 6809 because of the 4MHz speed but of course it won't do relocatable code.  If you're familiar with 6809 assembler code this will be a
>> cinch to pick up.  Some mnemonics are a little different but more ways similar than not.
>>
>> Dave
>>
>>
>> P.S. I got the Moxham board in the mail yesterday and ordered the FPGA dev board for it.  Looks pretty interesting!
>>
>>
>> On 2015-09-18 23:47, Kip Koon wrote:
>>> Hi Dave,
>>> I would very much like to experiment with your HC11 PCB.  It looks
>>> very interesting.  I'm currently reading a book called Microcontroller
>>> Technology - 68HC11 & 68HC12.  It would be interesting to play with
>>> this board as I learn the 68HC11.  I have several HC11F1 chips on hand
>>> I could use.  Please let me know everything I need to get this PCB
>>> going.  Thanks a bunch in advance!
>>>
>>> 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: Tuesday, September 15, 2015 2:00 PM
>>>> To: CoCoList for Color Computer Enthusiasts
>>>> Subject: Re: [Coco] Kip's Single Board Computer
>>>>
>>>> Yep, it probably will.  The beauty of the 'reset' chip is that it
>>>> continuously monitors VCC for an out-of-range value and will put the
>>>> CPU
>>>> back in reset if it finds that.  A lot of times what causes a CPU to
>>>> 'lock up' is some dirty supply voltage that cause the something
>>>> abnormal to show up on the data/address lines and then the CPU takes a
>>>> hike to la-la land.  This chip is like a power supply watchdog.
>>>> It also conditions a reset button input because, as you probably know,
>>>> mechanical switches can be noisy/bouncy.
>>>>
>>>> Here's a photo of a more recent revision of the board that I did with
>>>> onboard 5v regulator and a power supply barrel connector.  The
>>>> 'HC11 runs at 4 MHz bus speed, has full 16-bit external address bus,
>>>> buffered data lines, some decoded chip selects, internal 1K SRAM,
>>>> internal 512-byte EEPROM, serial port, SPI port.  The board has all of
>>>> the signals brought out to expansion connectors, the reset chip,
>>>> a 16 MHz oscillator, RS232 port, power LED. socket for RTC and
>>>> external EEPROM,
>>>> 27C256 EPROM socket, etc.  If anyone's interested in playing around
>>>> with one or building it from scratch I could make up some
>>>> documentation for it along with a basic monitor in EPROM.  I think I
>>>> still have quite a few bare boards floating around that I would sell
>>>> for cheap.  And, it's a tried and tested design.  As I said, I produce
>>>> somewhere in the neighborhood of 1,000-1,500 of these and they're
>>>> all still running now.
>>>>
>>>> http://www.davebiz.com/HC11-new.jpg
>>>>
>>>> Dave Philipsen
>>>>
>>>>
>>>>
>>>> On , John W. Linville wrote:
>>>>> Well, that seems fine.  But I think a simple capacitor will do the
>>>>> job... :-)
>>>>>
>>>>> John
>>>>>
>>>>> On Tue, Sep 15, 2015 at 12:34:59PM -0500, Dave Philipsen wrote:
>>>>>> So I just sent Jim an offer to send a couple of DS1233-10 chips.  The
>>>>>> chip basically holds a CPU in reset for 350ms after the power supply
>>>>>> comes up and is stable.  I have used probably 1,500-2,000 of these
>>>>>> over the years in a little 68HC11 board I designed about 20 years
>>>>>> ago:
>>>>>>
>>>>>> http://www.davebiz.com/HC11.jpg
>>>>>>
>>>>>> You can see the DS1233-10 in the upper left corner of the board next
>>>>>> to the oscillator chip.
>>>>>>
>>>>>> Dave
>>>>>>
>>>>>>
>>>>>> On , John W. Linville wrote:
>>>>>>> On Tue, Sep 15, 2015 at 12:06:04PM -0500, RETRO Innovations wrote:
>>>>>>>> On 9/15/2015 11:49 AM, John W. Linville wrote:
>>>>>>>>> On Tue, Sep 15, 2015 at 12:15:15PM -0400, RETRO Innovations wrote:
>>>>>>>>>>     The new board, as it were (it's getting less new by the month) is Kip's
>>>>>>>>>>     take on Searle's 6 IC 6809.  His is 8, and offers some interesting
>>>>>>>>>>     enhancement options.
>>>>>>>>>>
>>>>>>>>>>     But, when I try to bring the board up, I'm struggling:
>>>>>>>>>>
>>>>>>>>>>       * there is no signal on Q or E.
>>>>>>>>>>       * Nothing of interest on the crystal pins (though my Tek could be
>>>>>>>>>>         interfering with the feedback).
>>>>>>>>>>       * I took the CPU off the board, breadboarded with HALT and RESET
>>>>>>>>>>         high, crystal and caps installed, and still no Q or E.  I tried a
>>>>>>>>>>         known working 6809 from my SuperPET, and nothing.
>>>>>>>>>>
>>>>>>>>>>     I'm new to 6809/6309, so I am not sure where to start.  I am sure once
>>>>>>>>>>     I get the CPU running, the rest will be quick work, but the fact that I
>>>>>>>>>>     can't seem to get a 6809 by itself to generate Q and E bothers me and
>>>>>>>>>>     lowers my confidence that the board is ready to be debugged.
>>>>>>>>>>
>>>>>>>>>>     Kip, send the man a board.  I'll buy it for him.
>>>>>>>>>>
>>>>>>>>>>     Jim
>>>>>>>>> I'm fairly certain that the clock problem is caused by the lack of
>>>>>>>>> RC circuit on the RESET^ line, as I described in my earlier
>>>>>>>>> note...do I get a board too? :-)
>>>>>>>>>
>>>>>>>>> John
>>>>>>>> Happy to buy you one.  My time is precious, and saving 2-3 hours on
>>>>>>>> the bench is worth quite a bit at this stage in my life.
>>>>>>>>
>>>>>>>> So, for the 6809 noob, is there a data sheet page I should
>>>>>>>> reference for the correct cap/resistor values?
>>>>>>> So, the RESET^ reference on page 6 points to Figure 7 (which is on
>>>>>>> page 8).  There it refers to the initial low time as "tRC".
>>>>>>>
>>>>>>> Near the bottom of the chart in Figure 1 (on page 3) it shows a
>>>>>>> maximum value for tRC as 100mS.  Oddly, no minimum is listed.
>>>>>>>
>>>>>>> Referring to the Simon6809 schematic, it looks like he is using an R
>>>>>>> of 10Kohm and a C of 10uF.  That should put you right at that 100mS
>>>>>>> "maximum", but it works fine.
>>>>>>>
>>>>>>> Anyway, I would suggest something approaching 100mS.  Since Kip
>>>>>>> seems to have a 2.2Kohm pull-up on RESET^, maybe a 47uF capacitor
>>>>>> >from there to ground?  Of course, that ignores the R10 and LED
>>>>>>> path...you may have to try some different cap values if that doesn't work...
>>>>>>>
>>>>>>>> I remember the reset controller from my 68hc11 days.  Man, Motorola
>>>>>>>> was picky on reset.
>>>>>>> :-)
>>>>>>>
>>>>>>> John
>>>>>>> --
>>>>>>> John W. Linville		Someday the world will need a hero, and you
>>>>>>> linville at tuxdriver.com			might be all we have.  Be ready.
>>>>>> --
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>>>>>> Coco at maltedmedia.com
>>>>>> https://pairlist5.pair.net/mailman/listinfo/coco
>>>>> --
>>>>> John W. Linville		Someday the world will need a hero, and you
>>>>> linville at tuxdriver.com			might be all we have.  Be ready.
>>>> --
>>>> Coco mailing list
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>>>> https://pairlist5.pair.net/mailman/listinfo/coco
>> --
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>

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