Testing with the following four different Apple USB keyboards, with the HID Library extension “off” and running Mac OS 9.2.2… only the original iMac keyboard (M2452) did not display the keyboard dialog box (image below) at startup. In addition (also with the HID Library extension “off”, with all four keyboards) the second (+image below) also displayed the Apple Cinema Display dialog box as well. (With mouse connected to Cinema Display USB port and directly into machine’s USB port.)
(1). Original iMac USB keyboard M2452 (2). Extended Acrylic M7803
(3). Extended Model A1048 and (4). “Chiclet” Extended A1243.
Given now typical efforts to pare down, or to minimize the total “basic” number of extensions necessary and with the intended goal of maximizing overall performance… some may attempt turning this HID extension off. (I have done so in the past.) Certainly it is unnecessary when using an original
iMac keyboard… but yet there are other, possibly heretofore unknown resultant effects, apparently. Leave it on.
Awaiting M.A.R.L. labs’ insight. And at least
someone has “misplaced” Biscotti.