Sinclair ZX81 User Manual

If you've never seen any of this before then don't try to remember it straight away; just remember that
&
& maybe when you're familiar with these the rest will begin to make sense.
Experiment with all this by telling the computer to print various expressions containing
**
: e.g.
PRINT
3
**
(2+0),3
**
2*3
**
0
PRINT
4
**
-1,1/4
3. Type
LET
E=
EXP
1
Now E has the value 2.718281828..., the base of natural logarithms. Test the rule
EXP
a number = E
**
the number
for various numbers.
A
**
(B*C) = (A
**
B)
**
C
A
**
-1
= 1/A
A
**
(1/2)
= the square root of A

Sinclair ZX81 Specifications

General

Processor	Zilog Z80A
Processor Speed	3.25 MHz
ROM	8 KB
Input	Membrane keyboard
Storage	Cassette tape
Power Supply	9V DC
Dimensions	167 mm x 40 mm x 175 mm
Release Year	1981
Manufacturer	Sinclair Research
Weight	350 g
Operating System	Sinclair BASIC
RAM	1 KB
Ports	TV out, expansion port
Display	Television (RF modulator output)