Timex/Sinclair 1000

Zone Selection Notes

Paul Holmgren has refined our zone selection program one more step. If you want to know whether a given number falls below, within, or above the selected zone, then the original program works well. If, however, all you want to know is whether or not it falls within the zone, and don’t care whether excluded

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Zone Selection

Program successively adds 232 and 10 to the DATA value. If the initial value is > 23, the first addition results in a sum > 255; therefore a carry. If 13 < data < 24, then the second addition gives a carry, If data < 16, then no carry at all. BC is originally loaded

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