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<p>apparent from ZX81 users who encountered problems trying to save and load programs. To increase the data transfer speed, the team decreased the length of tones that represent binary data. Originally, the team aimed for 1000 <a href="page.php?w=baud">baud</a>, but succeeded in reaching a considerably faster 1500 baud. To increase reliability, a leading period of <a href="page.php?w=pure_tone">constant tone</a> was introduced, allowing the cassette recorder's <a href="page.php?w=automatic_gain_control">automatic gain control</a> to settle down,</p><p>
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