I'd want to take a look and understand how the downstream parts would react to the faster I/O and memory timing. The RAM and ROM systems are basically asynchronous - they look for edges and respond accordingly. So long as they are fast enough it should be ok. The PIO chip - unclear there, but I bet it would work
On Thu, Nov 26, 2015 at 3:53 AM, Georg Käter < georg.kae...@gk-engineering-services.de> wrote: > 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 > > > ---------- Forwarded message ---------- > From: "Alex ..." <abortretryf...@gmail.com> > To: Model 100 Discussion <m100@lists.bitchin100.com> > Cc: > Date: Wed, 25 Nov 2015 11:55:39 -0500 > Subject: Re: [M100] M10X/T200: Overclocking CPU > > 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 >>> >> >> >
