PowerShot A720 IS
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CHDK is available for the A720IS with firmware version 1.00C from the Download page |
Powershot A720 IS Front
Powershot A720 IS Back
Reviews and Specifications
Technical Data
| Release date: | August 2007 |
| Sensor CCD size: | 8.0 MP 1/2.5" |
| Lens (35mm equiv) zoom | 35-210, 6x |
| LCD size | 2.5" fixed |
| Card | SD / SDHC / MMC |
| Size (mm) | 96.5 x 66.0 x 43.2 |
| Weight (body) | 200 g |
Firmware Information
Firmware information is given if ver.req exists on the SD. (or maybe vers.req gives other result, such as total shots)
In PLAY mode (with ver.req) press FUNCSET and DISP simultaneously:
Canon PowerShot A720 IS P-ID:315D PAL D Firmware Ver GM1.00C E18 Jul 5 2007 11:32:58
Subsequent press of DISP (while still holding FUNCSET) reveals:
Adj Ver.012.006 ZoomLensError 2007.10.22 00:41:26
After another subsequent press of DISP (while still holding FUNCSET) reveals:
Adj Ver.012.006 IS Firm Ver. 3.00 IS Param Ver. 3.11
Installation
The normal install instructions do not work - there is no PS.FIR file.
(PS.FI2 is now included in a720-100c-0.9.8-788-full 2009-07-20) (first appearance : Feb 2009 ?)
The reason is that the new, DryOS based cameras (A720IS, A650IS) require the following process:
- Make the SD memory card bootable by Canon
(this is not the same as setting the partition bootable!). See Bootable SD card.
- Copy DISKBOOT.BIN to the root directory of the SD card.
- Write protect the card (cam will ignore locking after boot)
For Developers
Inside this decent camera, the OS is the new DryOS, see also DryOS Porting.
Firmware dumps
Firmware extraction using the blinker was some trouble but worked.
Here is the file: A720IS-100c.zip
Since DryOS firmware update procedure requires faultless PS.fi2 file, "Firm Update..." menu entry can't be used to run blinker.
Fortunately it is still possible to run blinker from "diskboot.bin" file on bootable and write protected memory card.
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Download location for firmware dumps: |
LED memory addresses
#define AF 0xC02200c0 // AF-Beam (red) #define DP 0xC02200c4 // direct-print (blue) #define OR 0xC02200c8 // orange state-led (bi-state with green) #define GR 0xC02200cc // green state-led (bi-state with orange) #define YE 0xC02200d0 // Yellow state-led #define PW 0xC02200d4 // Power (green)
Porting status (outdated)
→ porting the A720 is completed.
Canon switched the OS from VxWorks (used on earlier cams) to their own DRYOS with the A720. That means that a lot of reverse engineering was done to find out how to hook an extension like CHDK into the A720. See dpreview-posting and Canon page on DRYOS
Most of the porting work is nearly done now!
A complete port is finished. (A long time ago) Only few features are missing,? such as
usb-support for remote shooting- works now.- long filename support in filemanager
You need to:
- Download Latest CHDK build for the A720 from http://mighty-hoernsche.de/chdk/
- Enable bootdisk-support, see Bootable SD card and/or http://chdk.setepontos.com/index.php/topic,234.msg2508.html#msg2508
- To use CHDK with SDHC see here http://chdk.setepontos.com/index.php/topic,255.msg13984.html#msg13984
The dcraw beginning with version 8.82 supports RAW format for A720 IS.
Edited 21/05/09