These scrolltexts are found in 'The Mad Music Demo':

The Mad Music Demo by The Harlow Cracking Service

DEMO - CODING & GRAPHICS BY FREAK PLUG JOYSTICK INTO PORT 1 PUSH LEFT/RIGHT FOR MUSIC AND PRESS FIRE TO CONTINUE - DEMO - CODING & GRAPHICS BY FREAK PLUG JOYSTICK INTO PORT 1 PUSH LEFT/RIGHT FOR MUSIC AND PRESS FIRE TO CONTINUE - YGYGZGZG[G[G/G/G]G]G^G^G_G_G G G - 3 CODING & GRAPHICS BY FREAK - PLUG JOYSTICK INTO PORT 1 - PUSH LEFT/RIGHT FOR MUSIC - M AND PRESS FIRE TO CONTINUE - YGYGZGZG[G[G/G/G]G]G^G^G_G_G G G -