more 720is - General Help and Assistance on using CHDK stable releases - CHDK Forum

more 720is

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Offline papaone

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more 720is
« on: 02 / March / 2008, 19:57:02 »
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I too, like pmilosev earlier, have wasted  a whole afternoon trying to loadup my 720is. I can read, I'm not completely stupid but I can't find a ps.fir to load up yet it is talked about freely in various threads. Is it due to the DRYOS software?, if so can someone please explain in plain language what the current situation is. I have looked on the Wiki but there are assumptions made there which I (as a newbie to CHDK)  am not aware.   
Will some kind hearted person please spellout a tried and tested method of getting this seemingly remarkable box of tricks from my Windows PC to my camera.

Many thanks,

Papaone

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Offline BB

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Re: more 720is
« Reply #1 on: 02 / March / 2008, 20:32:03 »
The A720IS (and the A650IS--I believe) are Canon "Dry OS" cameras. These cameras do not have the "firmware update" function that the other cameras have (where you save the PS.FIR file, turn the camera on in "play" mode, then scroll down the menu to "update firmware"--names are approximate--I have an A720IS).

Of course--CHDK does not update the camera's firmware--in the other Canon cameras, it is just a convient way to get the "CHDK application" to load and run (in Windriver OS cameras).

So, for the A720 and A650 you will only find a DISKBOOT.BIN file, there is no PS.FIR file (the very first release of CHDK did have a PS.FIR file--but it would not do anything with the A720).

So, to get the A720IS code to work:

Format your SD/SDHC card with the Camera or with a program that can format FAT16 format. By the way, if your card is 4GB or larger, you probably need a SDHC compatable external USB adapter... And you will need to type (this is Windows):

Format x: /fs:fat   (where x: is replaced with your drive letter)

For 4GB SDHC cards, this will give a non-standard FAT16 table and may not read with some programs... But it does work fine with my A720 and my Sandisk SDHC adapter. And for any cards >4GB, the card will be formated to only 4GB and the rest of the card is not accessible (due to the FAT16 limitations). There may be other ways of using 8GB+ cards--but I am not sure that works right now--or at least makes things much more confusing for a newbie (like myself).

After you have formated the card, run the "bootable.exe" program (in Windows--or follow the HEX Editing instructions for other OS's). The bootable program just sets a bit in the SD/SDHC card that tells the camera that it is OK to boot from this card.

Now, copy your DISKBOOT.BIN file to the "root" or top directory on your x: card. Pay attention that you have the correct DISKBOOT.BIN for your camera and Camera's version (and that you have AllBest or which ever CHDK version you want to try).

Lastly, pull the card from your computer and slide the switch to "write protect" and place in your A720IS (the above instructions work for all CHDK compatible cameras).

Place the card in your camera and turn it on (play or shoot mode does not matter). And you should see the blue CHDK splash. And you are now ready to go.

Hope it helps!

-Bill
« Last Edit: 03 / March / 2008, 02:51:58 by BB »

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Offline papaone

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Re: more 720is
« Reply #2 on: 02 / March / 2008, 20:53:39 »
Thanks Bill, It will probobly be next weekend before I can have another bash at it, really appreciate your prompt answer.

Cheers,

Papaone

Re: more 720is
« Reply #3 on: 03 / March / 2008, 04:28:58 »
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« Last Edit: 22 / April / 2008, 13:28:41 by Barney Fife »
[acseven/admin commented out: please refrain from more direct offensive language to any user. FW complaints to me] I felt it imperative to withdraw my TOTAL participation. Nobody has my permission, nor the right, to reinstate MY posts. Make-do with my quoted text in others' replies only. Bye

 

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