HP Character Set
Because the HP calculators have many special characters thta are not easily shown on the personal computer (PC), a number of tricks have been developed to represent the special calculator characters.  These tricks include:

 

Digraphs
A DiGraph is a way of expressing special characters used on the calculator in the limited PC character set.  DiGraphs are often used to represent calculator characters for User RPL on the PC.  Because the HP RPLCOMP compiler does not support DiGraphs they cannot be used with Debug4x.

Escape Sequences
An Escape Sequence is a backslash followed by three hex digits.  The hex digits give the character code for a special character on the calculator.  For example the program start delimiter << is represented by the escape sequence \AB.  The HP RPLCOMP compiler and Linker will allow use of the escape sequence anywhere.  To generate or refer to an external name that will appear as NAME<<, code NAME\AB.

A table of Escape Sequences appears below.

 

List of Escape Sequences
Type a backslash (\) followed by the two digit hex numbers below to represent the special calculator characters.
 
Hex
DiGraph
    Description
1F
\1F
5C
\\
backslash
80
\<)
angle symbol
81
\x-
x with a bar
82
\.V
nabla operator
83
\v/
square root
84
\.S
integral symbol
85
\GS
Sigma
86
\|>
Bold triangle right
87
\pi
pi
88
\.d
derivative symbol
89
\<=
less or equal
8A
\>=
greater or equal
8B
\=/
unequal
8C
\Ga
alpha
8D
\->
right arrow
8E
\<-
left arrow
8F
\|v
down arrow
90
\|^
up arrow
91
\Gg
gamma
92
\Gd
delta
93
\Ge
epsilon
94
\Gn
eta
95
\Gh
theta
96
\Gl
lamda
97
\Gr
rho
98
\Gs
sigma
99
\Gt
tau
9A
\Gw
omega
9B
\GD
delta
9C
\PI
capital pi
9D
\GW
omega
9E
\[]
block cursor
9F
\oo
infinity
A4
\oX
BINT symbol (non-standard)
AB
\<<
program delimiters
B0
\^o
degree
BB
\>>
D7
\.x
multiplication
D8
\0/
empty set
DF
\Gb
beta
F7
\:-
divide

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