Sinclair ZX81 User Manual

Summary
This chapter has covered how to type messages in for the ZX81, explaining
the single keystroke system for words,
the & cursors,
reports,
the syntax error marker,
& how to correct mistakes using , and
RUBOUT
.
The keyboard
Here is a picture of the keyboard.
Remember that to use
SHIFT
, you have to hold it down at the same time as you press another key. Do
not confuse digit 0 with letter O.

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)