This song is by Bob Franke and appears on the compilation "Vince Emery Presents the Funniest Computer Songs" (1989)

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You been runnin' your program on your little PC
Tryin' to fix your business with your 1-2-3
That little Junior jus' can't manage your files
Well, I got some hardware that will make you smile

Chorus: 'Cause I'm a mainframe, baby
I got a hard disk, too
An' I can do twenty times
What that mini floppy driver can do

That's pow'ful software that you got to run
But you just can't run it on that sonovagun
That little Junior's got no mem-o-ry
Come on baby, get on line with me

Little lights of amber, little lights of green
You got more data than I've ever seen
That little board can't even dump your screen
Oh baby, check out the soul of a new machine