@tubetime telephony stuff? Edit: no, does not really match ss5.

Decoding artifacts due to the internal gates?

@tubetime Would have been extra funny if they just had exchanged 11 and 12 codes!

@tubetime I remember some old Skee-Ball machines displaying "HEL" on the score counter and "P" on the balls remaining digit to indicate that they had run out of tickets and still owed some to the player