Re: IIGS ADB mouse - Can it be adapted to IIe/IIc use??

[mjmahon@aol.com (Michael J. Mahon)]

Michael Black wrote:

>Stephen E Buggie (buggie@argo.unm.edu) writes:
>>      IIGS (ADB) MOUSE --- CAN IT BE ADAPTED FOR IIE/IIC USE?
>>      =======================================================
>> 
>> 
>> QUESTION: Can the ADB-style IIgs mouse be adapted for use with the IIe /
>IIc? Is it merely a matter of connecting a 
>> DB-9 plug?? Also, which wires should be connected between the DB-9 plug 
>> color code to the color code of the IIGS ADB mouse??
>> 
>Given that I thought the mouses for the earlier Apples were on the level
>of the original Mac mouse, no.  ADB, like serial and PS2 mouses for
>the IBM world, send out serial data.  The earlier computers are looking
>for a a number of discret lines, carrying such things as up/down, left/right,
>and their 90 degree shifted complements, and button(s) press.  The only
>way you could get a useful mouse out of an ADB mouse connector would be
>to throw in a computer to do the conversion.
>
>But, if you really want to mess the ADB mouse, likely you can find
>the needed signals inside the mouse.  You'd bypass the IC in there,
>and bring out the signals directly from the button swith, and the outpus
>of the 4 optocouplers, plus feed some voltage in to power the optocouplers.
>I once did this with an IBM type serial mouse, bringing out those
>signals to make a spare mouse for my Mac Plus.
>
>In other words, the ADB mouse is a superset of what's in a non-ADB mouse,
>and if you are willing to modify it, likely you will get a working mouse.

Except the ADB cable probably doesn't have enough wires...

-michael

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