If you search the specs on http://infocenter.arm.com for "Main ID register" you should get all the numbers you wish for :-)
Apparently it's called "ID Code Register" for ARM9 and the expected (not tested ;-) values would be:
ARM926 - 0x926 ARM946 - 0x946 ARM966 - 0x966
etc., you get the picture :-)
Paweł
PS. The number I quoted are valid when "CPU implementer" == 0x41 (ARM Ltd.)
PPS. I think older (and MMU-less) parts were using other scheme...