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27:
28, 29: Number Display Control Flags. Flag 28 controls the radix and
30-55: System flags. Can only be tested:
30:
31-35: Peripheral Flags. These flags are used internally for the operation of
36-39: Number Of Digits. These flags are used internally to control the
40, 41: Display Format Flags. These flags control the display mode
42, 43: Trigonometry Mode Flags. When flag 42 is set the calculator is in
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
CHS
Change sign of X
CLA
Clear ALPHA register
CLD
Clear display and the displayed register (either X or ALPHA)
CLP
"CLP ALPHA <prg name> ALPHA" deletes the specified program
"CLP ALPHA ALPHA" deletes the current program
CLRG
Clear all data registers
Clear statistics register. See ΣREG
CLΣ
CLST
Clear all stack register
CLX
Clear X register
COPY
Copy a user program
COS
Cosine using current trigonometry mode
D-R
Convert degrees (360) to radiants (2π)
DEC
Convert X register from octal to decimal
DEG
Set trigonometry mode degrees (360)
DEL
PRGM mode: Delete nnn commands starting with the current one.
User Mode Flag. This flag is used to place the calculator in user mode
separator marks. It may be set for American or European styles.
When flag 29 is set groups of three digits are separated with commas
or points depending on the setting of flag 28.
Catalog Flag. For internal use
certain peripherals
number of digits displayed
GRAD mode. When flag 43 a set the calculator is in RAD mode
Continuous On Flag. If flag 44 is on the HP-41C will stay on
indefinitely. If it is clear the calculator will turn off after 10 minutes of
inactivity
System Data Entry Flag. Used internally and always tests clear
Partial Key Sequence. Used internally and always tests clear
Shift Set Flag. Used internally and always tests clear
Alpha Mode Flag. When the HP-41C is in alpha mode flag 48 is set,
otherwise flag 48 is clear
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
Message Flag. If set, the display contains some message (not the
Alpha or X register)
SST Flag. Used internally and always tests clear
PRGM Mode Flag. Used internally and always tests clear
I/O Flag. When set, a peripheral extension is ready for I/O. Otherwise
device is not ready for I/O
Pause Flag. When set a PSE (pause) instruction in a program is in
progress
Printer Existence Flag. When set, an HP-41C printer is attached to the
calculator.
HP-41CV
3
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