HP -28S Quick Reference
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HP-28S
Note that the command does not accept binary numbers!
NUM Return ASCII code of the first character of the string in stack level 1 as a real
number.
→LCD
Writes the data of the given string into the LCD pixel memory.
Each characters inside the string represents 8 pixel. Bit0 of the first character
represents the pixel in the very top left corner. Bit1 of the first character the
pixel below etc. Bit0 of the 2
nd
character represents the 2
nd
pixel from left at
the very top of the display.
If the string does not contain enough characters to fill the entire LCD screen
then the remaining pixels are unchanged.
LCD→
Returns a 548 byte string representing the pixel data of the LCD screen.
Each character receives the data of an 8 pixel-column, starting with the
column in the top left corner of the LCD screen.
The screen itself is 137x32 pixel in size.
POS Seach for the string given in level 1 within the string in level 2 and return the
position where the string was found or 0 if not found.
"This is a string" "str" POS returns 11.
SUB Returns a substring of the string in level 3. The numbers in level 2 and level 1
specify the start and end position of the substring (counting from 1).
"This is a string" 3 7 SUB returns "is is".
Start and end positions cannot be specified in a length-2 list.
SIZE Returns the length of the string.
DISP Display the string in level 2 on the LCD display line given in level 1 (1…4). See
CONTROL Menu.
LIST Menu
General
• A list is a sequence of arbitrary objects which need not be of the same
type.
• Lists are entered by using curly brackets:
{1 (2,3) 5 "A" Q [7 8] {a b c}}.
• A lists may be put inside another list.
• In order to avoid evaluation of names when they are typed on the
command line to be put in a list they can be entered in single quotes or
with Alpha-Mode turned on. The quotes are removed when the list is
created.
+ Used to append objects of any type to a list:
• "Hi!" {1 2 3} + returns {"Hi!" 1 2 3}
• {3 4 5} [7 8 9] + returns {4 5 6 [7 8 9]}
• {1 2 3} {a b c} + returns {1 2 3 a b c} rather than
{{1 2 3} a b c}
→LIST Combine n elements on stack levels 2…n+1 into a list.
n must be given on stack level 1.
Some of the list components my be lists themselves:
{1 2 3} {a b c} 2 →LIST returns {{1 2 3} {a b c}}
LIST→ Splits a list into individual elements on the stack. The length of the list is
returned on stack level 1.
PUT Put an element into a list at the given position. Similar to PUT for matrices.
• {1 2 3} 2 'X' PUT puts the element X into the list at position 2 and
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