Bus Mouse Adapter

Has anybody here this adapter or knows specifics about it?



http://www.kevra.org/TheBestOfNext/NeXTProducts/NeXTHardware/NeXTMouseReplacement/NeXTMouseReplacement.html

What Bus Mouse does this adapt to? ADB or PS/2?

Has anybody a schematic of this adapter?

This adapter connects to a really old (Logitech) Bus Mouse, which used phase-shifted rectangle signals for X and Y direction as well as separate signals for left and right button. So, there is microcontroller inside the mouse like in more recent RS232, PS/2 or ADB mice. These bus mice used a separate ISA card with (I think) an intel 8255 PIO to control the mouse. Mice for Amiga and Atari use the same basic principle and can also be adapted.

In fact, I have one of the adapters and mice here, the adapter is a simple pinout converter. The NeXT mouse pinout can be found in the NeXT FAQ (http://www.faqs.org/faqs/NeXT-FAQ/), busmouse pinout is documented here (http://www.ardent-tool.org.uk/ohland/mouse.html#SBP-Mice).

If you're into microcontroller hacking, you could build a PS/2 mouse adapter yourself - there are several PS/2-to-Amiga/Atari adapters built with PICs or AVRs, for example this one (http://www.students.tut.fi/~leinone3/ps2mhiiri627/).

Btw., the NeXT keyboard protocol is definitely more complicated :-).

-- Michael