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One of my first pieces of professional (i.e. for pay) programming was writing a floating-point package (7-bit exponent, 16-bit mantissa) on the Z80 for use in a spectrum acquisition program. The standard Basic floating-point (Microsoft format - 8-bit exponent, 23-bit mantissa) was at least an order of magnitude too slow for what we wanted, but we didn't need high precision.
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