B2000
This message turned up in search, but its forum couldn’t be identified from the original transcript, so it may not be linked into its thread.
I'm not Dave, but my list of 2000 Motherboard jumpers sheet shows J200 as
being the jumper that determines how a lightpen will be read. With pins 2
and 3 jumpered (the normal way) the lightpen input is from the FIRE input
of mouse/joyport 2, just like the A500. With pins 1 and 2 jumpered the
input is from mouse/joyport 1, like the A1000. Keith