HP HP-65 User manual

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Quick
Reference
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This booklet is primarily intended for reference
use after you read the HP-65 Owner’s Hand-
book. The Procedures section (f1-110) is a
brief digest for the user who needs a quick re-
view of the more important operating proce-
dures. The Key Dictionary (11-67) provides
easy access to the details of the individual key
operations and switches. All symbols on the
HP-65 keyboard are presented in alphabetic
order in the dictionary; non alphabetic symbols
(c.g., ® ,[7]) are at the front (f11-714). A
genceral Index is provided at the end.
Procedures (11-110)
1. W/PRGM-RUN Switch
Set to: mmm RUN position to calculate, to run a
program, to read a pre-programmed card. =
Set to: W/ PRGM mmm position to clear program
memory, to key in a program, to edit a program,
to write a program on a magnetic card.
2. Doing Arithmetic in the Stack
Compute By Pressing
8—-2=6 8 ENTER# 2
8+-2=4 8 [ENTER% 2
-Io

(4X35)
(2+43)
shown below.
Compute: —6 — —2 using the keys
Contents of Stack Registers
20| 20
4 4 200 2| 2 | 20
X 4/ 4 5/ 20 223 5 4
Key (4] ¥ [5) ™ [2] & (3] #
NOTE: ENTER% s here abbreviated as #
<
N
-
-2
4
6
@_
3. Data Entry
Entering Negative Numbers. = Press [CHS
(change sign) after keying in the positive value.
Example: to key in —12, press 12 [CHS .
Entering Big and Small Numbers (Scientific
Format). Method: @ Key in mantissa @ Press
CHS if ncgative number ® Press [EEX @ Key
in exponent ® Press [GHS if exponent is nega-
tive. ® Example: To key in 5 X 1075, press 5
EEX 8 CHS .
Correcting Mistakes. Press [€LX and rcenter the
number.
PRINTED IN U.S.A © HEWLETT-PACKARD COMPANY, 1974
Procedures

4. Display
Controlling Display. To display x, rounded to
n fixed decimal places, press BRg [+ [n] (where
n—=20,1,...,9). To display x in scientific
notation, rounded to n places, press BEg [n]. =
Display can also be set by a program. Blinking
Display. = Blinking display occurs when an
illegal operation is attempted (Example: 5 — 0).
Depressing any key stops the blinking without
doing the key function. = Blinking occurs when
a program card is misread (or blank). = See the
Key Dictionary for the limitations on the follow-
ing: [n], [Lod), (], [sw], [cog], [oms+ ],
(cowms], [=oct], [, 5], B . Multiple
Decimal Points. The display also indicates low
battery power (all decimal points light up).
5. Prefix Operations
Performing ‘“Gold” Functions (Upshift). Rule:
Prefix gold function keys by il to do the func-
tion or [ to do the inverse. = Example: Cal-
culate log (100) = 2 by pressing 100 [l .
= Example: Calculate antilog (2) = 100 (the
inverse) by pressing [ [LOc]. Performing “Blue”
Functions (downshift). = Prefix blue function
keys by [@l. = Example: Calculate 5! = 120 by

pressing 5 @ []] . Correcting or Cancelling a
Prefix. = To correct a wrong prefix, merely
press the correct prefix. = To cancel a prefix,
press [f [PREr0C] . = Other prefix keys are BEg,
(€5 . S0 , We . [N .
16. Angular Mode
Operations involving angles (namely, ,
[SIv], ,[72N],[F=7]) assume the angles to be
in the units (degrees, radians, or grads) of the
prevailing angular mode as sct by (or power
on), [RAD], or [GRD]. = 360 degrees —2r ra-
dians = 400 grads. * Converting from One
Angular Mode to Another:
DEG DEG
W GO WG GO o)
/7. Storage Register Operations
Storing a Number in Addressable Register R,.
® Key in number to be stored. @ Press [§§@ [n]
(where n is a digit 1, . . ., 9). Recalling a Num-
ber from R,. Press [B8E [n] (where n is a digit 1,
» 9).
Procedures

Doing Storage Register Arithmetic.
Subtraction. (r, — x — R,): 810 = [n].
Addition, (r, + x > R,): %0 ¥ [n].
Multiplication. (r, X x —> R,): §%0 ¥ [n].
Division. (r, — x > R,): §%0 & [n].
where [n]is a digit 1, . . ., 9. x is unchanged in
these operations.
8. Clearing Registers
= Press X to clear X register. = Press [ [57¢]
to clear entire stack (X, Y, Z, and T) = Press
E to clear all storage registers (R,,...,Ry)
= Power on clears all registers.
9. Programming
Program Memory. = Used to contain user’s
stored program. Capacity: 100 locations = Top
is above 1st location. = Bottom is last location
= The Pointer, an internal part of the calculator,
determines which memory location is executed
or displayed. In W/PRGM Mode, keystrokes
are stored in memory as codes: The address for
top of memory is 00 00. The codes for keys 0-9,
are 00 — 09. For other keys, the code denotes
row and column. Example: Code for (row
8, column 4) is 84.
User Defined Functions. The top row keys are
used to call a user defined function. When the
calculator is turned on, default functions are de-

fined as shown in the window above the top row.
Alternate functions may be keyed in or read
from a magnetic program card. Pressing a top
row key finds the function and executes it.
To Write a Function: identify the beginning by
followed by the top row key that is to call
it. End the function with GI]. Example:
3 ((ENTERY ENTER® ¢ %)) The keys in
parentheses calculate x*, Keying in a function:
® Set W/PRGM-RUN switch to W/PRGM. ®
Press 'f| "7V to clear program memory. ®
Press the keys in the order shown ([ERA . .
in the sample case). If you make a mistake,
press & (to delete the error) and press the
correct key. To execute the function (from key-
board): ® Set W/PRGM-RUN switch to RUN.
® Press the appropriate top row key. For the
sample case, to compute 2* — 8, press 2[@; to
compute 3* — 27, press 3 @; etc. A user
defined function can also be executed from a
program by merely including the corresponding
top row key in the program. Revising (Editing) a
Program. To move the pointer to the top of
memory, press LRl in RUN mode. To
move the pointer to a label, press (in RUN
mode) [f]] [n] where n is the same digit or top
row key as in [n] (the label). To step

through your program, use in W/PRGM
mode (See 156). You will see the successive pro-
gram codes in the display. = To insert a step
below the currently displayed step, just key in
the new operation in W/PRGM mode. (See
132). To delete a step or correct a mistake,
press 8 in W/PRGM mode (See 121).
Both overflow and underflow of a register will
stop a program.
1110. Using Magnetic Cards
Reading a Pre-recorded Card. = Set
W/PRGM-RUN switch to RUN. = Insert the
card in the right lower slot, = If the card does
not read properly, display will flash and program
memory will be cleared (but, with no effect on
registers). Press and reinsert the card.
Recording (Writing) on a Program Card. =
Set W/PRGM-RUN switch to W/PRGM. =
Insert unprotected (unclipped) card in right
lower slot. = Protect the card by clipping the
notched corner.

Key Dictionary (711-167)
This section contains reference entries for all
keys with their associated symbols. In addi-
tion, the following entries are included. Insert,
1132. Last X, 934. Merged Codes, 739. OFF-ON
Switch, §43. Stack Lift, 157. W/PRGM-RUN
Switch, 162.
A | 9
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=
STk o |
PREFIX

111
=, ¥, X, % Arithmetic Operations. Calcu-
late respectively: (y —x), (y + x), (y X X),
y =x). = =
Contents l Register
t T T
z \z
y Y
X <result-X
Last X
For storage register arithmetic, see 59.
112
[0] . . . [9] Digits. Digits are used: @ to enter
data (73), @ to specify registers (159,
1149), ® to label program steps (135, 131),
@ to specify displayed decimal places
(124). =
113
[+] Decimal Point. The (-] key is also used to
specify fixed decimal display (724). =
14
Inserts = (3.141592654) into the stack X
register. = &
15
B.8.8.0 .3 Top Row Keys. When used