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Macintosh portable trackball ADB pinout

A

alh84001

6502
I got my hands on a macintosh portable trackball, and from reading the manual it seems to be a regular ADB input device. I'd like to connect it to an ADB converter but I'm wondering what the pinout is. Can someone with a portable please trace it? Trackball uses pins 1 (GND), 27, 28, 29. Looking at the pics of the logic board online, it looks like they go into PMGR chip, which is in line what is stated in the manual that ADB on the portable is handled by a PMGR chip and not a separate one. I'm a bit confused why there are four pins used, since in ADB, fourth pin is used for power switching, which I doubt this trackball has anything to do with.

Thanks on the help.

 
Interesting, the Luggable's NumPad is a dumb, direct parallel interface from Keyswitch matrix to PMGR. I thought the same was true of the TrackBall? Mine's not handy ATM, is there an ADB controller on its PCB? I don't remember seeing one, so if not, you may only have GND, Up/Down, Left/Right and Click inputs feeding raw data to PMGR. Check for IC legs on the on the solder side of the trackball PCB.

I always thought the PB100 trackball was an ADB box, which I figured was part and parcel with board size reduction by Sony. Now that I think of it, I'm wondering if it has a controller IC in there or not?

If it's raw data, ADB conversion would not be necessary. A controller IC compatible with those inputs and a simple PCB sould suffice. A mouse board could work?

 
Last edited by a moderator:
@techknight much appreciated!

@Trash80toHP_Mini yeah, I thought it might be dumb since there is "too many" pins used, but there are some chips there (I can only see the bottom of the PCB as I don't have it disassembled), and then I read in the manual that it is ADB. Numpad is dumb, and it's not a completely separate matrix, but actually gets "plugged into" keyboards matrix.


Trash80toHP_Mini

 
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