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HP-41CV

global label.
„GTO ..“ packs program memory and goes to the unused program memory 
area to be able to enter a new program. In PRGM mode „ss REG nnn“ is 
displayed where nnn is the amount of available program registers (with about 
6 commands per register).

HMS

Convert X from decimal to hour/min/sec (h.mmss) representation
Example: 1.5 HMS results in 1.3000

HMS+

Add Y + X 

 X in h.mmss format

HMS-

Subtract Y - X 

 X in h.mmss format

HR

Convert X from hour/min/sec (h.mmss) to decimal representation.

INT

Integer part of X

ISG

Increment and skip if greater. See DSE. See RCL for indirect addressing 
modes

LASTX

Recall the most recent value of the X register

LBL

Enter a local numerical label (00–99), a local character label (A – J and a – j) 
or a global character label (2 – 7 characters or a non-local single-character 
label) in a program.
In USER mode the program code at a local character label of the current 
program can directly be executed by pressing one of the two top row keys. Ie. 
pressing “1/x” executes the code at local label “B”. This works for labels “A” – 
“J”. Pressing “SHIFT 1/x” executes the code at label “b”. This works for labels 
“a” – “j”
Note that if a key has been assigned to a function or program using the ASN 
command no local labels are executed.
Local labels are only visible within the current global program. 

Warning

: You can enter a "global" program that starts with a local label. 

However, after the focus moved away from this program (ie. by executing 
another program or by executing "GTO..") you cannot easily access this 
program!! A GTO to the local label or an XEQ will fail with NONEXISTENT. 
Also, it is not possible to use "CLP" to delete the memory occupied by the 
program! The only way to move the focus to this "hidden" program is to use 
"CATALOG 1" and carefully watch for an "END" that is not preceeded with a 
global label. After the listing has been stopped when this "END" is displayed 
switching to PRGM mode will display the program and it is possible to delete it 
step-by-step to reclaim program memory.

LN

Logarithm base e

LN1+X

Calculate ln(1+x), used for small values of x

LOG

Logarithm base 10

MEAN

Mean value of data in the statistics registers. See 

Σ

REG

MOD

Modulo (reminder) of division Y/X

OCT

Convert X register from decimal to octal

OFF

Turn calculator off

ON

Turn calculator on. 
If the „

“ key is held down while turning on a 

global reset

 is executed and all 

data, stack and program registers as well as user flags are cleared

P-R

Convert polar coordinates (X=angle, Y=length) to rectangular coordinates 
(X,Y) using current trigonometry mode

PACK

Pack the program memory

%

Percent. This does not pop the stack

%CH

Percentual difference from Y to X. This does not pop the stack

PI

π

 = 3.1415…

5

Summary of Contents for HP-41CV

Page 1: ... program steps available When the number of storage registers is reduced to 10 using SIZE 010 then 309 registers are available for programs corresponding to 1854 program instructions Available functions Use the CAT command to get a list of internal and external functions Use XEQ ALPHA name ALPHA to execute a command which is not directly available on the keyboard Use the same sequence to enter suc...

Page 2: ...by END instructions Press PRGM to edit the currently listed program CAT 2 Functions in expansion modules CAT 3 Built in functions CAT 0 4 9 Same as CAT 3 R S halts the listing SST shows next entry BST shows previous entry See RCL for indirect addressing modes CF Clear flag nn See RCL for indirect addressing modes Flags are 00 10 General purpose flags where flags 0 3 are shown in the LCD display Ca...

Page 3: ...lly and always tests clear 48 Alpha Mode Flag When the HP 41C is in alpha mode flag 48 is set otherwise flag 48 is clear 49 Low Battery Flag When this flag is set battery power is low The BAT annunciator will also show in the display when this flag is set 50 Message Flag If set the display contains some message not the Alpha or X register 51 SST Flag Used internally and always tests clear 52 PRGM ...

Page 4: ...it is skipped RUN mode The test result is displayed YES or NO FC C Check whether flag nn is clear and then clear it See CF FIX Select fix point display format rounded to n valid digits after the decimal point Will automatically switch to SCI format if the number gets too big or too small This does not affect the internal representation of the number See RCL for indirect addressing modes FRC Fracti...

Page 5: ...l labels are only visible within the current global program Warning You can enter a global program that starts with a local label However after the focus moved away from this program ie by executing another program or by executing GTO you cannot easily access this program A GTO to the local label or an XEQ will fail with NONEXISTENT Also it is not possible to use CLP to delete the memory occupied ...

Page 6: ...t it will not overwrite the contents of the ALPHA register If a register contains an ALPHA string it cannot be used for indirect addressing RDN Rotate stack down same as R RND Round the X register according to the number of valid digits as specified in the current ENG SCI or FIX command RTN PRGM mode Return to calling program or stop if at the top level RUN mode Go to line number 0 of the current ...

Page 7: ...ues 12 Sum of X X values 13 Sum of Y values 14 Sum of Y Y values 15 Sum of X Y values 16 Number of values TAN Tangent using current trigonometry mode TONE Play a tone with a frequency proportional to n 0 9 The argument can indirectly be obtained from a register TONE SHIFT 00 uses the number in data register 0 as frequency parameter VIEW Display contents of register nn without overwriting the X reg...

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