On Jan 9, 2014, at 1:40 AM, cctalk-request at classiccmp.org wrote: Generally true. It?s also possible to label other keys as ?subroutine headers? and execute the subroutine from the keyboard (by for example hitting SBR Sin, if somewhere in the magnetic-card-loaded code is a PGM Sin (I think, been a while) followed by <code> followed by RTN. So it does help to have documentation with the magnetic stripe card. But for most cards, Tony is right, the 5 function keys were what called the pieces of code on the card. Also agreed with the other users, the ROM packs came with plain plastic label strips, which were totally superfluous if you had the documentation and could remember which key did what. - Mark