Quote from: Peter_A720 on 02 / August / 2018, 12:15:55I figured out that the "i-contrast" in the standard menu cause the overexposures with bright light!!! "i-contrast" turned off and "custom auto ISO" works as expected!!!Thanks for that, I added this info to the camera notes.
I figured out that the "i-contrast" in the standard menu cause the overexposures with bright light!!! "i-contrast" turned off and "custom auto ISO" works as expected!!!
It's probably a safe bet that i-contrast interferes with quite a few CHDK functions. It is known to cause problems with raw raw develop at least:
So far I've always thought that i-contrast has no effect on the RAW's and that only the dark areas in the JPG development are pushed up.
Just an interesting technical observation I made recently.The DIGIC 6 has 16kB ATCM and 64kB BTCM.ATCM is always mapped to address zero. In earlier D6 PowerShots (such as this cam), BTCM is mapped to 0x80000000. On newer D6 models, BTCM is at 0xbfe10000.I just noticed that one of the MPU regions on this cam does cover 0xbfe10000, so I went ahead testing it. I found that there is at least 64kB RAM mapped there which seems unused (filled completely with random bytes).I filled it with a magic word and looked whether it becomes visible in main RAM or elsewhere. I could not find that content elsewhere - not in RAM and not in the TCMs. So, it looks like this cam has an extra 64kB of memory.I could not find anything in ROM that would reference 0xbfe1xxxx ...
That's pretty strange. You could try to find out if it's as fast as normal RAM (or TCM, but that seems unlikely)
One thing I've wondered but never got around to experimenting with is how much (if any) of the BTCM is used on cams that don't copy dryos code there. Even on the ones that do copy, there might be a fair bit available (sx710 copies ~30kb)
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