[Coco] Kip's Single Board Computer
Dave Philipsen
dave at davebiz.com
Sat Sep 19 02:23:01 EDT 2015
I do but I'm not sure they would necessarily be of interest to you:
A rather large board has 64 digital outputs that drive 24vdc loads. It
has an opto-isolated UART that receives RS422 data to control the
outputs. There are terminal blocks so that 24v solenoids may be wired
directly to the board. Parallel with the terminal blocks are to DB37
connectors which basically carry the same signals.
An NTSC video overlay controller that also receives RS422 data and can
overlay text characters on a standard composite NTSC video signal.
Additionally there are some opto-isolated digital inputs and an RS232
port that originally controlled a pan-tilt video camera. There is at
least one digital output that was used to modulate an IR LED to simulate
an IR remote control for a video printer. A dual-port RAM facilitates
communication between the PC's ISA bus and the 68HC11 card.
An ISA bus 'transmitter' card that transmits DMX-512 (theatrical
lighting control) and the RS422 data that controls the cards above. Also
included some digital inputs and outputs. The card also has a dual
digital potentiometer (Dallas Semi). There is a video sync separator
circuit on the board that allows the vertical sync from an NTSC video
source to trigger interrupts on the 68HC11.
There are some other boards that also used the HC11 card but these are
the most prominent ones. The descriptions above are rough descriptions
and at least one component (for the NTSC video overlay) is almost
certainly no longer available.
Dave Philipsen
On 9/19/2015 1:05 AM, Kip Koon wrote:
> Hi Dave,
> Do you have other boards that connect to the expansion connectors?
>
> 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.
>>>>>> --
>>>>>> Coco mailing list
>>>>>> 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
>> --
>> Coco mailing list
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>> https://pairlist5.pair.net/mailman/listinfo/coco
>
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