[Coco] Kip's Single Board Computer
Kip Koon
computerdoc at sc.rr.com
Sat Sep 19 02:05:52 EDT 2015
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
More information about the Coco
mailing list