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

Jonathan Gevaryahu jgevaryahu at gmail.com
Sat Nov 2 19:11:09 EDT 2019

On 11/2/2019 11:16 AM, David Gesswein via vcf-midatlantic wrote:
> On Fri, Nov 01, 2019 at 01:25:33PM -0400, Win Heagy via vcf-midatlantic 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 opened mine up and took pictures.
> http://www.pdp8online.com/misc/3b1_mouse.jpg
> http://www.pdp8online.com/misc/3b1_mouse2.jpg
> Found this thread. Conclusion seems to be it talks TTL serial.
> https://groups.google.com/forum/#!topic/comp.sys.3b1/nawn1zyNWMg
> You would likely need to make an adapter to convert some other mouse to the
> 3b1 protocol.
That SC87347P // R6-6805 // JG28509 chip is an MC6805 microcontroller; 
if someone has a mouse like that they could lend me for a month or two, 
I could extract the firmware from that chip, which will probably help a 
lot for making a device to use a modern mouse instead of the original one.

Also, it is needed for proper 3B1 emulation, so its win-win.

Jonathan Gevaryahu
jgevaryahu at gmail.com
jgevaryahu at hotmail.com

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