Dear all,
thank you for your comments/ideas. I?ll do further investigations in that
matter. Maybe M100
can run CPU @ 9,8304MHz outer clock, related systemclock @pin 37 has then just
to be
divided by 2 through a 74LS293 or equal to feed the PIO and further components
with the
"old" base clock.
What?s your opinion about this?
Kind regards
Georg Käter
On Nov 25, 2015 11:55 AM, "Alex ..." <abortretryf...@gmail.com> wrote:
The cassette routines will probably be broken by this too, though you might be
able to "overclock" the tape recorder (or MP3 file) to match. :)
On Nov 25, 2015 9:43 AM, "Stephen Adolph" <twospru...@gmail.com> wrote:
Hi Georg,
Very interesting! I think there could be impact on sounds as well.
Tundra semiconductor made a processor capable of 10MHz also. I have not yet
played with that.
It could be possible to make an adapter that includes a /4 circuit to feed
correct clock to the UART, and also the 81C55.
This is an interesting idea, worth exploring.
Steve
On Wed, Nov 25, 2015 at 9:33 AM, Georg Käter
<georg.kae...@gk-engineering-services.de> wrote:
Hello together,
I did some try out on overclocking the 80C85 in my M100. I was quite
successful using an oszilator
with 7,3728MHz which gives a CPU clock 50% higher than the original one. My
M100 run with this
w/o any issues in running BASIC so far, gain in performance is visible and
amazing. But there is one thing
you might have an solution or even idea how to solve for. TELCOM and any
program communicating via
serial port are not working as PIO 81C55 gets the clock from CPU which is now
50% above the original
value.
Any comment from you is welcome
Kind regards
Georg Käter
--- Begin Message ---
The cassette routines will probably be broken by this too, though you might
be able to "overclock" the tape recorder (or MP3 file) to match. :)
On Nov 25, 2015 9:43 AM, "Stephen Adolph" <twospru...@gmail.com> wrote:
> Hi Georg,
> Very interesting! I think there could be impact on sounds as well.
> Tundra semiconductor made a processor capable of 10MHz also. I have not
> yet played with that.
> It could be possible to make an adapter that includes a /4 circuit to feed
> correct clock to the UART, and also the 81C55.
> This is an interesting idea, worth exploring.
> Steve
>
> On Wed, Nov 25, 2015 at 9:33 AM, Georg Käter <
> georg.kae...@gk-engineering-services.de> wrote:
>
>> Hello together,
>>
>> I did some try out on overclocking the 80C85 in my M100. I was quite
>> successful using an oszilator
>> with 7,3728MHz which gives a CPU clock 50% higher than the original one.
>> My M100 run with this
>> w/o any issues in running BASIC so far, gain in performance is visible
>> and amazing. But there is one thing
>> you might have an solution or even idea how to solve for. TELCOM and any
>> program communicating via
>> serial port are not working as PIO 81C55 gets the clock from CPU which is
>> now 50% above the original
>> value.
>> Any comment from you is welcome
>>
>> Kind regards
>> Georg Käter
>>
>
>
--- End Message ---
