[vcf-midatlantic] Speaking of the 3b1...

John Ruschmeyer jruschme at gmail.com
Fri Nov 1 18:35:26 EDT 2019


The 3B1 mouse looks like a stylized version of the Logitech C7 mouse of the
same era.

On Fri, Nov 1, 2019 at 2:19 PM Ethan Dicks via vcf-midatlantic <
vcf-midatlantic at lists.vcfed.org> wrote:

> On Fri, Nov 1, 2019 at 1:35 PM Win Heagy via vcf-midatlantic
> <vcf-midatlantic at lists.vcfed.org> wrote:
> > I have a 3b1 that I think is mostly complete and working, but I'm missing
> > the mouse.  Is there anything unique about the mouse (other than its
> > looks)?  Can another mouse be made to work with it?  I've seen the mouse
> > listed on eBay but for $$$$.
>
> I wasn't quickly able to find any schematics of the keyboard, just the
> mainboard, but the 3B1 mouse plugs into the 3B1 keyboard via a
> proprietary connector.  It's _not_ a generic mouse physically.  The
> keyboard connects to the CPU via serial interface (through a 6850
> UART) so it's possible that the mouse is an ordinary serial mouse of
> the era.  There must be some magic in the keyboard that reads mouse
> events and sends them up the serial line to the CPU.
>
> The other trick is it's a three-button mouse which was not common in
> personal computers of the era.
>
> -ethan
>


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