William Gibson’s poem played from a 3½-inch diskette on a 1992-era Mac computer running the System 7 operating system. When the diskette ran, the text of the poem scrolled up the screen (accompanied by infrequent sound effects—a camera shutter click, a gun going off—while an encryption program on the diskette encoded each line and made the poem “disappear” after its first reading. A one time only text.
On December 9, 2008, the sixteenth anniversary of the original “Transmission” event debuting Agrippa, there was an emulated run of the poem based on a bit-level copy of an original diskette loaned by collector Allan Chasanoff.
It has always interested me how data can be played back when the original recording / decoding [playback] machines no longer function