The hardcovers were titled in an orange monospace font on a dark background. This was in elementary school, and they were pretty worn, so from about 1990 at the latest (I think it was unusual that the kid had a computer at his house, and there was no GUI, but I think it had a regular CRT monitor, not a room-sized dinosaur.) The computer had a name - not Herbie, that's the lovebug, but something similar - but I don't think it was actually sentient, just anthropomorphized like you do with important machines. Might have had emotions like a pet, though.
The one specific story I remember is about a contest with a smug kid at school and his supercomputer (Oxford/Ocelot/something like that?). The contest was to find a submarine somewhere in the Atlantic. The supercomputer had more MIPS and was the obvious favorite, but our heroes won the day by looking up actual ocean currents and stuff and plotting a likely course to search first instead of brute-forcing it.