Here's an assortment of observations on computer usage on the show...
[7G04] Dr. Marvin Monroe has one of the World's more sophisticated electric generators (tape drives and everything..) {cjb}
[7G09] Cowboy Bob uses a computer to check Homer's credit rating.
[7F02] Definitely an IBM-PC/XT/AT seen in the background when Smithers raids the personnel office. {cjb}
[7F03] Computers were seen in Bart's dream about spending the rest of his life in the fourth grade.
[7F10] The Devil uses a Macintosh computer in Bart's `Life after death' experience.
{Raymond Chen's capsule makes a pretty good case this is just a generic GUI-based system. -cjb}
[7F13] Homer tells Bart to hide his stolen Macintosh computer. {To my eyes it looked like only a dumb terminal. -cjb}
[7F23] Ned has a left-handed computer at his Leftorium shop.
[8F04] Smithers appears to have punched up something on a keyboard to get Homer's job file. (Also a SNPP employee is briefly seen running with a computer during the meltdown scare.)
[8F04] One of the SNPP employees takes off with a Macintosh SE. {cjb}
[8F07] The `National Fatherhood Institute' had computers.
[8F11] Dave Shutton has a laptop computer.
[8F12] Prof. Frink creates the ``Gamble-Tron 2000'' to pick the outcome of football games.
[8F15] Bart & Lisa's aptitude tests were graded by a computer in Iowa.
[9F10] A couple of thieves were stealing a Macintosh computer while Springfieldians were at the town meeting.
{NB: The thieves didn't steal the keyboard. -cjb}
[9F15] The dentist uses a computer to show what will happen to Lisa if she doesn't get braces.
[1F02] Pretty much every scene with the nerds.
[1F04] Martin had a `Wang Computers' T-Shirt. {There's a funny bit of folklore about Wang Computers and T-shirts... cjb}
[1F12] Smithers has a computer.
[2F01] Itchy & Scratchy Land is run by computers.
[2F05] Dolph has a Apple Newton. {sh}
[2F07] UPC scanner/satellite linkup is featured (which is obviously run by computers).
SNPP has a computer voice for meltdown/self-destruct warnings [8F04, 1F02].

Dave Hall (davehall@cyberspc.mb.ca)
cjb - Chris J Baird
sh - Simon Humphries (sim@macline.co.uk)