pv2 hardware register $f70a
In looking at the use of pv2 hardware register $f70a in the 6550_2B and 6600_2B firmware we find it is never read and the only values written to it are $00, $70, and $11. Changing the $11 in one place causes the camera to fail to turn on fully seemingly due to failure to write to watchdog timer because somewhere the code may be waiting on another register to change to zero or not zero. I haven't found where it is yet. A few times it is set to zero because of following code a wait for beep to complete which is done by checking $f703 until it is zero.
In looking at the use of pv2 hardware register $f70a in the 6550_2B and 6600_2B firmware we find it is never read and the only values written to it are $00, $70, and $11. Changing the $11 in one place causes the camera to fail to turn on fully seemingly due to failure to write to watchdog timer because somewhere the code may be waiting on another register to change to zero or not zero. I haven't found where it is yet. A few times it is set to zero because of following code a wait for beep to complete which is done by checking $f703 until it is zero.