Atari 400 User Manual

-.0789
5
77.39
o
+.000001
67.98
Introduction to Atari BASIC 45
Again, negative floating point numbers should be preceded with
the minus sign (-). Positive floating numbers can optionally be
preceded with the plus sign (+), however, a floating point
number is assumed positive if it doesn't have a sign.
Scientific Notation
Atari BASIC uses scientific notation to express either extremely
large or extremely small numbers. A number in scientific
notation takes the following format :
± x E yy
Where ;
± is an optional plus or minus sign.
x can
either be an integer or a floating point number. This
position of the number is known as the coefficient or
mantissa.
E stands
for exponent
yy is a one or two digit exponent. The exponent gives the
number of places that the decimal point must be moved to
give its true location. The decimal point is moved to the
right with positive exponents. The decimal point is moved
to the left with negative exponents.
The
following examples specify a number in both standard
floating point and scientific notation:
1000000 -1 E6
.000001 -1 E-6
57500000-5.75 E+07
- . 00000479-4.79 E-06

Atari 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)