This had me curious. There is the 101-key U.S. layout, and the 102-key International layout, with a key between Z and the left-hand space, and a different Enter key.
But what's a 103-key keyboard? 104-key and 105-key keyboards are the 101-key and 102-key keyboards with the Windows keys added. Yes, I've seen 103-key keyboards where one Windows key is omitted, or they left out Scroll Lock, but that's Logitech, not Unicomp.
So I went to the Unicomp page. And, sure enough, there was a link for 102/103 key terminal keyboards.
Following that link, though, I saw a picture of what looked like a 101-key keyboard. Same Enter key, same spacebar:
http://pckeyboards.stores.yahoo.net/10keyterkey.htmlBut the key where the * key on the numeric keypad is, is white instead of buff. And the + key on the numeric keypad is split in two.
So that 102-key keyboard is not an international layout keyboard; the 103-key keyboard is its international version. These are keyboards that won't plug in to a PC, but are designed for 3153 or 5250 terminals - and the numeric keypad has an extra key because it follows the design of the one on the 122-key keyboard.
So
that's the difference between 101/102 and 102/103.
EDIT: But wait a moment. There's another link, to Customizer 102/103 Pearl White. If I follow
that link, I do see a picture of an international keyboard. Is the "/103" a typo? Perhaps it should be Customizer 102/106 Pearl White, to include the Japanese layout?
