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 decimal digits.  The decimal digits give the character code for a special character on the calculator.  For example the program start delimiter << is represented by the escape sequence \171.  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\171.

A table of Escape Sequences appears below.

 

List of Escape Sequences
Type a backslash (\) followed by the three digit decimal number below to represent the special calculator characters.
 
Decimal
DiGraph
    Description
031
\1F
092
\\
backslash
128
\<)
angle symbol
129
\x-
x with a bar
130
\.V
nabla operator
131
\v/
square root
132
\.S
integral symbol
133
\GS
Sigma
134
\|>
Bold triangle right
135
\pi
pi
136
\.d
derivative symbol
137
\<=
less or equal
138
\>=
greater or equal
139
\=/
unequal
140
\Ga
alpha
141
\->
right arrow
142
\<-
left arrow
143
\|v
down arrow
144
\|^
up arrow
145
\Gg
gamma
146
\Gd
delta
147
\Ge
epsilon
148
\Gn
eta
149
\Gh
theta
150
\Gl
lamda
151
\Gr
rho
152
\Gs
sigma
153
\Gt
tau
154
\Gw
omega
155
\GD
delta
156
\PI
capital pi
157
\GW
omega
158
\[]
block cursor
159
\oo
infinity
164
\oX
BINT symbol (non-standard)
171
\<<
program delimiters
176
\^o
degree
187
\>>
215
\.x
multiplication
216
\0/
empty set
223
\Gb
beta
247
\:-
divide

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