Tom P aka "Mad Dog" asks:Does anyone know which chip on the 3400 controlls the ADB ?
Opening the PB3400 devnote . . . the "Architecture" block chart on page 11 shows the PMU IC with ADB responsibilities. Then on pages 15 and 16 we find this helpful info:
<quote> Power Management Unit The power management unit (PMU) is a 68HC05 microprocessor that operates with its own RAM and ROM. The PMU IC performs the following functions: controls sleep and power on and off sequences controls power to the other ICs controls clock signals to the other ICs supports the ADB scans the keyboard controls display brightness monitors battery charge level controls battery charging" </quote>
does any of that help?
Well, that leads me to a general direction. Now I must peruse ICMaster and find out what a 68HC05 looks like.
What the heck are you up to now? <G>
Dan K
I have a couple of dead 3400 motherboards that have no ADB/trackpad, so I will just swap around ADB chips. Trouble is , I never knew until now what it was.....
thanks,
Mad Dog
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