Thanks for providing the link, Mac128. I guess the search feature on this site was offline recently. 
I've been a Newton user (in Japan) for a very long time, and I must say that I don't know where you folks are find this so-called "keyPAD"! There is an Apple Newton keyBOARD and some 3rd party keyBOARDs, but no keyPAD that I am aware of. A keyPAD is typically also called a "Numerical" Keypad, whereas a keyBOARD has all the ABCs and often the Numerical keyPAD as well.
If you would like to see my Newton Keyboard running smoothly on my SE/30 over serial, have a look at these photos (where I provide a link in the description to the required driver):
Photo#1
Photo#2
Of course, if you followed Mac128's link, you will have found those photos already.
I've been a Newton user (in Japan) for a very long time, and I must say that I don't know where you folks are find this so-called "keyPAD"! There is an Apple Newton keyBOARD and some 3rd party keyBOARDs, but no keyPAD that I am aware of. A keyPAD is typically also called a "Numerical" Keypad, whereas a keyBOARD has all the ABCs and often the Numerical keyPAD as well.
If you would like to see my Newton Keyboard running smoothly on my SE/30 over serial, have a look at these photos (where I provide a link in the description to the required driver):
Photo#1
Photo#2
Of course, if you followed Mac128's link, you will have found those photos already.