Texas Instruments TI-95 User Manual page 103

Base Conversions (Continued)
Two's
Complement
and Signed
Notation
Unformatted
Mode
In the hexadecimal andoctal modes, you can select how
negative numbers are displayed and entered. *
> Pressing <2sC) causes numbers to bedisplayedin
two's complementnotation. In this notation, the most
significantbit is the sign bit, so the range of numbers
that can be displayed in hexadecimalor octal modeis
smaller. Negative numbers are displayed without a
minussign, but they can be entered as negative
numbers using either of two methods. You can set the
mostsignificant bit for anegative numberorpress the
key. If you use the 'ey, it must be pressed
after you complete the numberentry. When you
press the keyafter pressing <2sC>, the numberin
the displayis immediately converted toits two's
complementhexadecimaloroctal equivalent
(depending on which has been selected).
> Pressing [INV] <2sC) causes negative numbers to be
displayedas thepositive form preceded by a minus
sign. (The calculatoris in signed notation when you
first turn it on. You only needtoselectthis notationif
you havepreviously selected two's complement.)
With signed notation, you mustuse a minus sign when
entering negative numbers. Pressing
notation displays (or removes)the minus sign.
Pressing (UNF) convertsthe calculator to the
unformatted mode, allowing you to display and enter
data-register contentsin internal hexadecimal form.
This modeis not convenient for numeric applications. It
is usefulmainly to programmers because it simplifies the
entry of hexadecimal values, such as those used during
1/0 (input/output) operationsinvolving certain external
devices.
Forinformation on using the unformatted mode, refer to
AppendixA ofthe TI-95 Programming Guide.
4-14 Conversions