Sinclair ZX81 User Manual

from pounds & ounces to ounces & back again
(i) when all the numbers are written in decimal?
(ii) when all the numbers are written in hex?
2. How would you convert between decimal & hex? (Hint: exercise 1.)
When programs on the ZX81 to convert numerical values into the strings giving their hex representation,
& vice versa. (This is what
STR$
&
VAL
do with decimal representations.)
3. Suppose people from Venus have a total of eight fingers, without thumbs, how would their octal (base
eight) counting be useful with computers?

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)