[jpstewart]

i better use a regular mouse i think...

What do you mean by "regular" mouse?  The Sun Type 5 mouse isn't compatible with any other (non-Sun) mice.  So if by "regular" you mean a PC mouse, it won't work.  I know it looks like a PS/2 connector but it isn't electrically compatible.

There is, however, a mechanical (non-optical) Sun Type 5 mouse that will work instead.  (Also called the "Compact 1" mouse.)  The Sun Type 6 with a DIN connector (not the USB one) is also an option.  I think the Type 6s are all mechanical.  So if by "regular" you simply mean "not optical", then you're fine as long as you stick to Sun-branded mice.