HP HP-65 - Page 94

Minimize the exposure of your calculator to dusty, dirty en-
vironments by storing it in the soft carrying case when not in
use. Each card pack contains one head cleaning card.
ABRASIVE CARD FOR CLEANING RECORDING HEAD
CONSULT MANUAL FOR RECOMMENDED USE
— THIS SIDE UP —
The magnetic recording head is similar to magnetic recording
equipment. As such, any collection of dirt or other foreign matter
on the head can prevent contact between the head and card,
with consequent failure to read or write. The head cleaning card
consists of an abrasive underlayer designed to remove such
foreign matter. However, use of the card without the presence
of a foreign substance will remove a minute amount of the head
itself. Thus, extensive use of the cleaning card can reduce the
life of the card reader in your HP-65. If you suspect that the
head is dirty, or if you have trouble reading or writing programs,
by all means use the cleaning card; that’s what it is for. How-
ever, if one to five passes of the cleaning card does not clear up
the situation, send your calculator in for servicing.
Annotating a Card
You can write on the non-magnetic side of your card using any
writing implement that does not emboss the card. It is customary
to write a program name on the top and to write symbols identi-
fying the functions of the top row keys in the spaces below.
Annotating magnetic cards with a typewriter may impair the
read/write properties of the cards.
Using Alternate Track
It is possible to store a program on the opposite edge of a card
(and to later read it) by inserting the other end (opposite to the
arrowhead), face up. Thus, a card can hold two 100-step pro-
grams. However, we recommended that you use only one track
since: