In article <annqtcpko5qt5jstcknb17vlqebga24ll3@4ax.com>, robertwessel2
@yahoo.com says...
>
> On Tue, 10 Oct 2017 12:17:52 -0400, Walter Banks
> <walter@bytecraft.com> wrote:
>
> >On 2017-10-07 4:48 AM, Rafael Deliano wrote:
> >> Am 05.10.2017 21:45, schrieb Walter Banks:
> >>> I have a customer that is looking for a Motorola 6805 EVM or other
> >>> devolopment board board. He has an old project that he needs to
> >>> change.
> >>
> >> Apart from the "E" all popular 68HC05 were EPROM-OTPs. So he needs
> >> windowed EPROM-parts and a programmer. That was the low cost
> >> "Motorola M68HC05 EVM" emulator:
> >> http://www.68bits.com/m68hc05evm.html It did emulate & program.
> >>
> >> The alternative were very low cost boards for specific types like "C"
> >> "B" that were pretty useless for emulation but usable for
> >> programming. He would need to specify which type he uses.
> >>
> >> The real answer ( no customer wants to hear ) is of course: porting
> >> to something modern will be cheaper in the long run.
> >>
> >> MfG JRD
> >
> >Thanks all. He is using 68HC05C8's BTW. Another old customer saw the
> >post and emailed me about an EVM board he has. The old EVM board is
> >about all that is needed in this case.
> >
> >Porting to something modern is not always the cheaper or best solution
> >but often is. This is one of those cases.
> >
> >Over the last few years I have seen some other cases where porting old 8
> >bit applications to 32 bit general purpose processors has not worked
> >very well. The issue in several cases has been the difference in
> >generated emi between processor 8 and 32 bit data streams inside the
> >processor. We had several old customers that had re-developed old
> >projects around the same time and contacted us about problems they were
> >having. Initially I assumed that it was an experience issue with a
> >different technology. I was at a trade show a few weeks later and an
> >friend who specializes in board layout and emi minimization opened a
> >conversation over lunch making similar comments with the internal
> >radiation comment as the cause.
>
>
> I'd expect the more modern CPUs to have typically have considerable
> lower emitted noise, but at a higher frequency.
Yes and No, as the old device is probably sub 10MHz and the new device
has at least four times as many transmitters at same time, running
internally at least at probably greater than 30Mz.
The levels of radiation at the higher harmonics will change compared
to older base frequency, and more lower power transmitters may well be
higher radiation then the 5th or higher harmonic of the original.
Then it depends if the rest of the system is affected by higher
harmonics.
--
Paul Carpenter | paul@pcserviceselectronics.co.uk
<http://www.pcserviceselectronics.co.uk/> PC Services
<http://www.pcserviceselectronics.co.uk/LogicCell/> Logic Gate Education
<http://www.pcserviceselectronics.co.uk/fonts/> Timing Diagram Font
<http://www.badweb.org.uk/> For those web sites you hate
Reply by Robert Wessel●October 10, 20172017-10-10
On Tue, 10 Oct 2017 12:17:52 -0400, Walter Banks
<walter@bytecraft.com> wrote:
>On 2017-10-07 4:48 AM, Rafael Deliano wrote:
>> Am 05.10.2017 21:45, schrieb Walter Banks:
>>> I have a customer that is looking for a Motorola 6805 EVM or other
>>> devolopment board board. He has an old project that he needs to
>>> change.
>>
>> Apart from the "E" all popular 68HC05 were EPROM-OTPs. So he needs
>> windowed EPROM-parts and a programmer. That was the low cost
>> "Motorola M68HC05 EVM" emulator:
>> http://www.68bits.com/m68hc05evm.html It did emulate & program.
>>
>> The alternative were very low cost boards for specific types like "C"
>> "B" that were pretty useless for emulation but usable for
>> programming. He would need to specify which type he uses.
>>
>> The real answer ( no customer wants to hear ) is of course: porting
>> to something modern will be cheaper in the long run.
>>
>> MfG JRD
>
>Thanks all. He is using 68HC05C8's BTW. Another old customer saw the
>post and emailed me about an EVM board he has. The old EVM board is
>about all that is needed in this case.
>
>Porting to something modern is not always the cheaper or best solution
>but often is. This is one of those cases.
>
>Over the last few years I have seen some other cases where porting old 8
>bit applications to 32 bit general purpose processors has not worked
>very well. The issue in several cases has been the difference in
>generated emi between processor 8 and 32 bit data streams inside the
>processor. We had several old customers that had re-developed old
>projects around the same time and contacted us about problems they were
>having. Initially I assumed that it was an experience issue with a
>different technology. I was at a trade show a few weeks later and an
>friend who specializes in board layout and emi minimization opened a
>conversation over lunch making similar comments with the internal
>radiation comment as the cause.
I'd expect the more modern CPUs to have typically have considerable
lower emitted noise, but at a higher frequency.
Reply by Walter Banks●October 10, 20172017-10-10
On 2017-10-07 4:48 AM, Rafael Deliano wrote:
> Am 05.10.2017 21:45, schrieb Walter Banks:
>> I have a customer that is looking for a Motorola 6805 EVM or other
>> devolopment board board. He has an old project that he needs to
>> change.
>
> Apart from the "E" all popular 68HC05 were EPROM-OTPs. So he needs
> windowed EPROM-parts and a programmer. That was the low cost
> "Motorola M68HC05 EVM" emulator:
> http://www.68bits.com/m68hc05evm.html It did emulate & program.
>
> The alternative were very low cost boards for specific types like "C"
> "B" that were pretty useless for emulation but usable for
> programming. He would need to specify which type he uses.
>
> The real answer ( no customer wants to hear ) is of course: porting
> to something modern will be cheaper in the long run.
>
> MfG JRD
Thanks all. He is using 68HC05C8's BTW. Another old customer saw the
post and emailed me about an EVM board he has. The old EVM board is
about all that is needed in this case.
Porting to something modern is not always the cheaper or best solution
but often is. This is one of those cases.
Over the last few years I have seen some other cases where porting old 8
bit applications to 32 bit general purpose processors has not worked
very well. The issue in several cases has been the difference in
generated emi between processor 8 and 32 bit data streams inside the
processor. We had several old customers that had re-developed old
projects around the same time and contacted us about problems they were
having. Initially I assumed that it was an experience issue with a
different technology. I was at a trade show a few weeks later and an
friend who specializes in board layout and emi minimization opened a
conversation over lunch making similar comments with the internal
radiation comment as the cause.
w..
Reply by Rafael Deliano●October 7, 20172017-10-07
Am 05.10.2017 21:45, schrieb Walter Banks:
> I have a customer that is looking for a Motorola 6805 EVM or other
> devlopment board board. He has an old project that he needs to change.
Apart from the "E" all popular 68HC05 were EPROM-OTPs.
So he needs windowed EPROM-parts and a programmer.
That was the low cost "Motorola M68HC05 EVM" emulator:
http://www.68bits.com/m68hc05evm.html
It did emulate & program.
The alternative were very low cost boards for specific
types like "C" "B" that were pretty useless for emulation
but usable for programming. He would need to specify which
type he uses.
The real answer ( no customer wants to hear ) is of course:
porting to something modern will be cheaper in the long run.
MfG JRD
Reply by habib●October 6, 20172017-10-06
Le 05/10/2017 à 21:45, Walter Banks a écrit :
> I have a customer that is looking for a Motorola 6805 EVM or other
> devlopment board board. He has an old project that he needs to change.
>
> Sorry for the off topic post.
>
> Contact me off line
> w..
Hi,
It's not off topic at all here !
Your customer has an old project to change you say ; so it needs a
preliminary study to verify if modern microcontrollers could fit the
requirements and i'm sure it will. But ...
But software tools side remains THE criteria of choose.
I have extensive experience with architectures based on stm32, avr32,
avr at(x)mega ... etc. All are supported by gcc, gdb, jtag(openocd)
which are very productive under the GNU/Linux dev platform.
OTH, H.
H.
Reply by David Brown●October 5, 20172017-10-05
On 05/10/17 21:45, Walter Banks wrote:
> I have a customer that is looking for a Motorola 6805 EVM or other
> devlopment board board. He has an old project that he needs to change.
>
> Sorry for the off topic post.
>
It is not off-topic, so no need to apologize. But I am afraid I haven't
use the chip, so I can't help.
> Contact me off line
> w..
Reply by Walter Banks●October 5, 20172017-10-05
I have a customer that is looking for a Motorola 6805 EVM or other
devlopment board board. He has an old project that he needs to change.
Sorry for the off topic post.
Contact me off line
w..