Business applications
Mike Costello · 1983
The first comment to be made about use of the ZX81 as a business tool is that its application in this way must be strictly limited; there is no point in over-optimism about its power. Apart from slow execution speed and limited memory, problems are likely to be encountered with any program that needs to hold values representing amounts of money, because the five-byte floating-point arithmetic format is the only one available on the machine, and this can, of course, produce errors when one is attempting to calculate exact amounts.