new addition: grid laptop

i traded my brother a ncr mca box for something called a grid compass ][ 1129. it's a quite large laptop with what seems to be in a metal <!> case and a 3.5x5 inch screen. it also has an access door with 4 roms installed; gridrom 3.1.5 write/term/format, gridrom 3.1.0 grid-os system, gridmail 103.2.2 and gridos utility rom, 3.1.0 the machine works, but only from ac power. it also has a screen saver with bouncing balls! =D my brother says he got it from a guy who worked in the aerospace industry who said this machine was supposedly used to compute some kind of vectors or something or other for the space shuttle program back in the 80's although i have no way of quantifying that. on the back of the machine there is a proprietary serial connector and phone jacks and something called a GPIB port; can anyone say what that is? i'm still trying to figure out the preloaded apps, but i've stumbled upon a passwoid option which i may have to hack through. i welcome any info or opinions on this beast. it's esoteric enough to keep in my collection. david