There are five VGA releases. I thought there were only four VGA (dark blue sticker) releases, two VGA only (light blue) (one with 3.5 inch and one with 5.25 inch) and two VGA releases (with 5.25 + 3.5 inch and one with 3.5 inch). But there is another 5.25 VGA release, which has "640K RAM" on the...