Republished in 1984, on ISBN 0-8359-1816-5 (158 pages). Also published by Reston on ISBN 0-8359-1815-7 (hardcover) and 0-8359-1814-9 (paperback). "Originally published as THE EXPLORER'S GUIDE TO THE ZX81 AND TIMEX SINCLAIR 1000" However that book in its turn was previously published as " The Explorers Guide to the ZX81" by Timedata. "References to the ZX81 apply equally to the T/S 1500 and T/S 1000" - this statement is erroneous as the T/S 1500 has a different ROM.
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