On the Alpha we used a 32MHZ oscillator and though not ideal, it worked but ran a bit slower.
Just wondering if this will be the same on the H4 board? Could we use a 32MHZ OSC or does it have to be the Atari specific one? I have some 32.0MHZ OSC and need to know if I can use these or need to purchase from your store.
32.084988MHz oscillator
32.084988MHz oscillator
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Re: 32.084988MHz oscillator
You can use other oscs like 32MHz, but things will run slower like you say. Likely some demos may not work etc either. The 32.084988Mhz is 8.021247Mhz which I think Troed said was the best value to use.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: 32.084988MHz oscillator
So for the initial build and testing, I could get away with a 32.0MHZ one and it would show slower performance like the Alpha. Thanks for confirming. Will get the 32.084988MHz oscillator later once I have a working board or two.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Re: 32.084988MHz oscillator
The 32.08s are not exactly easy to find so I was wondering if there was a way to change the frequency somehow. I did a little googling and found this:
https://www.eham.net/community/smf/inde ... #msg977819
In the Ham Radio world, they do what is called "pulling" a crystal to tweak the frequency. From the above post, it looks like a small capacitor placed in series should "pull" the crystal frequency up.
I'm unsure if what they are doing can be applied here. Perhaps someone with a scope is willing to put a 32 MHZ crystal and a cap in series and see if they can come up with 32.08xxx?
https://www.eham.net/community/smf/inde ... #msg977819
In the Ham Radio world, they do what is called "pulling" a crystal to tweak the frequency. From the above post, it looks like a small capacitor placed in series should "pull" the crystal frequency up.
I'm unsure if what they are doing can be applied here. Perhaps someone with a scope is willing to put a 32 MHZ crystal and a cap in series and see if they can come up with 32.08xxx?
Re: 32.084988MHz oscillator
I don't believe you would be able to pull it near enough not to mention its an osc so you have no access to the xtal.chue wrote: ↑Thu Nov 28, 2019 2:12 am The 32.08s are not exactly easy to find so I was wondering if there was a way to change the frequency somehow. I did a little googling and found this:
https://www.eham.net/community/smf/inde ... #msg977819
In the Ham Radio world, they do what is called "pulling" a crystal to tweak the frequency. From the above post, it looks like a small capacitor placed in series should "pull" the crystal frequency up.
I'm unsure if what they are doing can be applied here. Perhaps someone with a scope is willing to put a 32 MHZ crystal and a cap in series and see if they can come up with 32.08xxx?
Re: 32.084988MHz oscillator
They not easy to find, its why I stock them in my store, and also why they expensive, because they cost a lot to obtain.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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Re: 32.084988MHz oscillator
Just ordered mine from your new store
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
32.215905 MHz oscillator
Looking for advise for use on 60hz us tos versions. Can someone tell me does US tos set up the timing differently than the 50hz ones and if so does the clock need to be higher 32.215905 MHz for this arrangement
Tom
Happy new year
Tom
Happy new year
Re: 32.215905 MHz oscillator
Nope, its a lower freq. It's 32.0424 mhz. Best Electronics sells the osc or xtal. Just google "atari best", there pretty extensive for most of their items and have limited hrs. Something like 1-5pm.
Re: 32.084988MHz oscillator
Note that you can buy custom oscillators set to any frequency of your choice from Digikey for like 3-4 US dollars (+ shipping, obviously). Never tried it myself, though.