[Coco] Kip's Single Board Computer
Dave Philipsen
dave at davebiz.com
Sat Sep 19 02:29:43 EDT 2015
Oops, the 'dual port RAM' sentence below should be connected to the
paragraph describing the ISA bus transmitter. I suppose if you were
wanting to build some sort of DMX-512 controller if you were into
controlling theatrical or architectural lighting there are some things
you could do with the transmitter board. It would even work in a
standalone fashion without being plugged into the PC bus if you wanted.
Come to think of it maybe I'll find a use for one of these in my PT68K-4
computer when I get it up and running again with OS9 68000.
Dave
P.S. None of the boards are overly complicated. They are all 2-layer
and they were built for very specific purposes.
On 9/19/2015 1:23 AM, Dave Philipsen wrote:
> 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
>>>>> Coco at maltedmedia.com
>>>>> https://pairlist5.pair.net/mailman/listinfo/coco
>>> --
>>> Coco mailing list
>>> Coco at maltedmedia.com
>>> https://pairlist5.pair.net/mailman/listinfo/coco
>>
>
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