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NFG Forums => SIG X68000 => Topic started by: Andrew on December 13, 2021, 03:24:25 AM

Title: where can I buy a 69.55199Mhz oscillator?
Post by: Andrew on December 13, 2021, 03:24:25 AM
I have a Sharp X68000 with a leaking battery. The battery damaged the 69.55199Mhz oscillator.
It outputs 25Mhz instead of 69 now.

Does anyone know where I can buy these? I'm from Europe.

I'd appreciate any help. Thank you.
Title: Re: where can I buy a 69.55199Mhz oscillator?
Post by: leonk on December 14, 2021, 03:46:31 AM
I posted about it here:  https://twitter.com/leonkiriliuk/status/1459972306923503620?s=20

Purchase CPPT1-HT5RT from Digikey and ask them to program it to the speed you want.
Title: Re: where can I buy a 69.55199Mhz oscillator?
Post by: leonk on December 14, 2021, 03:47:50 AM
Or, you can go with something modern:  https://twitter.com/antongale/status/1459893180334284801?s=20
Title: Re: where can I buy a 69.55199Mhz oscillator?
Post by: Andrew on December 17, 2021, 03:43:30 AM
unfortunately the CPPT1-HT0PT and CPPT1-HT5RT are both sold out at Digikey.

@leonk: When I search for CDCE925 I get only results for the chip itself. Where did you buy that  pcb and what additional hardware and software is required to program the chip?

Thanks for your support.

Title: Re: where can I buy a 69.55199Mhz oscillator?
Post by: leonk on December 17, 2021, 10:14:40 AM
Look at the twitter feed to see how the person used the provided software to change the frequency of the modern solution.  I've never tried it myself; I'm used digikey programmed crystals per my specifications.  Too bad that method is going away.
Title: Re: where can I buy a 69.55199Mhz oscillator?
Post by: leonk on December 17, 2021, 10:31:47 AM
But here's all the info you need to make your own DFO PCB (5V for X68000) as well as the programmer to setup whatever frequency you want:  https://nfggames.com/forum2/index.php?topic=5744.0

If you don't have the skills to make these PCBs yourself, you can always purchase premade boards like this:  https://videogameperfection.com/products/dual-frequency-oscillator/

I'm sure you can reach out to the web site owner and request they program a DFO with the required X68000 frequency and ship it to you.  You'll just need how to solder it in by comparing pinout of what's there vs what the PCB puts out.
Title: Re: where can I buy a 69.55199Mhz oscillator?
Post by: Andrew on February 01, 2022, 08:51:40 AM
Unfortunately videogameperfection does not offer custom frequencies.

I've used this project instead:
https://oshpark.com/profiles/micro

works fine in my Sharp X68000.

I've enclosed my custom HEX File for the programmer.
Title: Re: where can I buy a 69.55199Mhz oscillator?
Post by: japanretroct on August 14, 2022, 02:52:49 AM
Hi Andrew i have an og x68000 with dead clock could you sell me one DFO ?