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Can the turbulence demo run at 100MHZ? — Parallax Forums

Can the turbulence demo run at 100MHZ?

KyeKye Posts: 2,200
edited 2010-08-10 16:38 in Propeller 1
Just asking. Thanks,

I want to use a 6.25Mhz crystal

Comments

  • SapiehaSapieha Posts: 2,964
    edited 2010-08-09 22:07
    Kye wrote: »
    Just asking. Thanks,

    I want to use a 6.25Mhz crystal

    Hi Kye.

    I think it will not be any problem.
    I even run it on 15MHz PLLx8 some time ago without problems.
  • KyeKye Posts: 2,200
    edited 2010-08-10 07:31
    I emailed linus and he said he hardcoded it so... Weird stuff will happen if I try.
  • SapiehaSapieha Posts: 2,964
    edited 2010-08-10 07:37
    Kye wrote: »
    I emailed linus and he said he hardcoded it so... Weird stuff will happen if I try.

    Hi Kye.

    I hard recoded PLL setings in his BIN file and NOT had any problems with 15 MHz PLLx8.

    Ps. You can find on old Forum my version of BIN file for PLLx8
  • bhenningbhenning Posts: 13
    edited 2010-08-10 09:09
    I suspect that some timing dependancy was missed when he hard coded it for you.

    Probably in the TV driver - I noticed that quite a few of the TV drivers have built-in assumptions for 80MHz in their FREQA constants.
    Kye wrote: »
    I emailed linus and he said he hardcoded it so... Weird stuff will happen if I try.
  • Nick McClickNick McClick Posts: 1,003
    edited 2010-08-10 09:16
    It's VGA.

    I, too, don't think it will work, I thought that some video generation stuff was time critical - let us know!
  • localrogerlocalroger Posts: 3,452
    edited 2010-08-10 16:38
    I can't see why it wouldn't work. The sound will be a little higher pitch and it will run faster. The VGA output will be at a different frequency but modern monitors are equipped to deal with all kinds of wacky timing.
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