Quote:
Originally Posted by mmatej
Strange they haven't connected any power stabilizer to the port. They must have known about it when they made it that way. Yes, external lamp does not need it, but... And about that ticks - there are not any output. They appear after enabling power on the port and after that it ticks with interval like 5/sec. Unfortunately, this spoils the attempt to make some data port out of it. I'll try to connect it to the counter to see if it counts that ticks (definitely yes, but to be sure). Then it would be needed to clean them. Not sure if it drops to 0V, but if not, it should be sufficient to move voltage level.
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It is possible that the power is briefly turned off every 5 seconds to see if a it is plugged into a cradle with a battery charger or something. It is unclear in the source code because it looks like that code calls a USB charger an "accessory port" charger because most references are mixed into USB code.
You may be able to get rid of the ticks by loading a custom linux kernel from /mnt/us (which we can do with kexec, as shown in a thread). A custom kernel could also have direct port access to output reasonably useful audio on a K4.