Protecting (Clipping) Cards - HP 82104A Owner's Handbook Manual

10 Card Reader Operations
Program Cards. A program card is one that has program instructions
stored on it. Each side of a card (track) can store up to 16 registers of
program instructions. So, if you had program memory of the basic
HP-41C completely full with program instructions, you could write all
of that information onto just two cards (four tracks). Each additional
memory module (64 registers) is equivalent to two more magnetic cards.
Data Cards. Data cards are simply cards that have data from the
HP-41C data storage registers written on them. As with program cards,
each card holds up to 32 registers (16 on each track).
Status Cards. Status cards have special status information written on
them. The information includes the status of flags O through 43 (which
includes display format and trigonometric mode); statistics register loca-
tions; number of data storage registers; key reassignments of standard
HP-41C functions and plug-in application module functions; and con-
tentsof X, Y,Z, T, LAST X, and ALPHA registers. The function
is used to write the status information on cards.
'""Write-All'" Cards. ''Write-All'' cards are special cards that hold the
entire contents of the calculator. is used to write all information in
the calculator onto cards.
Protecting (Clipping) Cards
Information on any of the types of cards can be ''protected'' from
inadvertent clearing or re-recording. To protect a track of a recorded
card, clip the notched corner of the card at the beginning ofthe track you
wish to protect.
. 7~
Clip here to —» ,@ fl
protect track 1. ettt ¥ —Cllip here to
protect track 2.
Not here — you might lose some
of the information on the card.
When you have clipped a track of a card, you can read the information on
that card into the HP-41C any number of times, but you will not be able
to write any information onto that card unless you specifically instruct
the HP-41C to do so. You will learn more about this later.