HP 33s User Manual page 141

If the result of an operation cannot be represented in 36 bits, the display shows
 and then shows the largest positive or negative number possible.
Example:
Here are some examples of arithmetic in Hexadecimal, Octal, and Binary modes:
Keys:
¹ ¶
{  }
Ï Ù
12F E9A
¹ ¶
{  }
Ï
7760 4326
Ï ¯
100 5
¹ ¶
{  } 5A0
¹ ¶
{  } 1001100
Ù
¹ ¶
{  }
¹ ¶
{  }
12F + E9A
16
Display:

7760 – 4326
8
Ã
100 ÷ 5
8
5A0 + 1001100
16
 _  Changes to base 2; BIN
 Result in binary base.

Base Conversions and Arithmetic
= ?
16
Description:
Sets base 16; HEX
annunciator on.
 Result.
= ?
8
 Sets base 8; OCT
annunciator on. Converts
displayed number to octal.
 Result.
= ?
8
 Integer part of result.
= ?
2
 _  Set base 16; HEX
annunciator on.
annunciator on. This
terminates digit entry, so no
Ï
is needed between
the numbers.
 Result in hexadecimal base.
Restores decimal base.
10–3