Some of The Deceased...
-First, you would certainly have a lot of people dead in the ATL, due to the need of a computer-regulated pacemaker. Some of the politicians include V.P. Dick Ceney, Sen. Jesse Helms, former-Sen. Bob Dole, Sen. George Voinovich, former-Mayor Ed Koch,President Carlo A. Ciampi (Italy), former-President Suharto (Indonesia), and former-Chancellor Helmut Schmidt (Germany)...
-Second, you certainly have a poorer ATL. You don't have online banking, ATMs, online trading, NASDAQ, and Nikko Stock Exchanges. In the ATL, expect the stock echange to be roughly 3,000-5,000 points compared with OTL's 10,000 points. As such, you can expect a financial situation similar to the late 1970s and early 1980s. Also, you can expect the "tiger economies" of Asia to be smaller paced (e.g. South Korea, Taiwan, Japan, Philippines, Vietnam, et al.)
-Third, you would also see a longer Gulf War in 1991. Consider that the military technology that made "Desert Storm" (1991) and "War on Terror" (2002) dazzling and lopsided victories would not be in existence. As such, you will have more casualties, civilian and military, rather than the pristine scenes we are accustomed to. Odds are things would resemble the scenes of Somalia and Vietnam....
-Fourth, no George Lucas, no matter how you cut it, the special effects that he created post 1978 would be non-existent. On the good side you have no Jar-Jar Binks in the ATL. The bad part is that you have more Muppets.....