Kenyan businesses ran on the Sinclair QL
As it was small enough to smuggle in when there was 160% duty and sales tax on computers, as President Daniel Arap Moi had declared the only purpose of a computer was to put secretaries out of work.
A complete direct mail marketing company ran on the QL. While I wrote a timekeeping programme for the Nairobi Round Table 24 hour pedal cart race. It had multi-tasking assembly programs controlled by a QL BASIC one.
Even before that, the university microelectronics course that trained the first ever computer technicians in the country used a lab full of Sinclair Spectrums - connected to a cassette recorder via an amplifier and cooled with frozen tetrapaks of milk.