Posted By
MMS
on 2019-10-11
15:43:53
 |  Re: Apart of new clean and bigger scans... GEOS 3.5x + mouse
@GeTE
If you refer this document. It is made by me.
It is based on BSZGG's design, but he made no ENGLISH documentation (corr), he had a prototype and a Hungarian description
I though it is a great concept and wanted to create one based on it anyone can easily build.
So I made what I am good at: searching on the internet and make loooooong documentation. 
On the other hand I found one you can buy it ready, I am confident it has the same Max232 circuit inside (this is the de facto standard for TTL/RS232 conversion), but it will cost you 18Pount +postage. and certainly still no driver for Plus/4:
https://www.simulant.uk/shop/Commodore64-Commodore128-User-Port-to-rs232-Adaptor-C64-C128-to-9-Pin-Serial
As explained previously, the C64 User port seems to behave the same as the Plus/4 one for serial communication.
I did not choose the PS/2 protocol, because it has different versions, in special modes much higher communication speed required than the RS232 ones, and the wheel/3rd button makes the protocol even more complicated.
Nice black mouse what you found!
My choice for Plus/4 mouse is a blue Microsoft mouse, because it has a less rounded design, the third in the list (I bought the second IBM RS232 mouse, but looks a little too bulky)
https://oldcomputer.info/pc/apmice/index2.htm
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