HP HP-67

Card Reader Operations 279
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You can write on the non-magnetic side of a card as shown above
using any writing implement that does not emboss the card.
Annotating magnetic cards with a typewriter may impair the
load/record properties of the cards. To permanently mark a card, you
can use India ink or a permanent felt-tip pen.
Data Cards
As you know, you can record programs on magnetic cards for
permanent storage, and then simply pass the card containing a
program through the card reader whenever you want to run it again.
You can also record data from the storage registers onto a magnetic
card for permanent storage or for use at a later time. Then, a day,
a week, a year later, simply pass the data card through the card reader
to restore the original contents of the storage registers.
With this feature of the HP-67 you can store extremely large
quantities of data for future use, or you can use each card to preserve
a series of constants.
Recording Data onto a Card
The function and the card reader on your HP-67 allow
you to record as much data as you wish on magnetic cards. To record
data on a magnetic card:
1. Set the W/PRGM-RUN switch weram [lIMIRuN to RUN.
2. Store data in any storage register—R, through Ry, Rg, through
Rgg, Ry through Rg, or L.
3. Press {3 (write data onto card). The calculator will
display to indicate that you are to pass a card
through the card reader.