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Spectrum tape interface: Difference between revisions
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Pulse counts and lengths for Pilot and Sync
(Blocks and Pulses. Header structure, data block structure. Some gaps) |
(Pulse counts and lengths for Pilot and Sync) |
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| Line 5: | Line 5: | ||
== Pulses == | == Pulses == | ||
A 'pulse' here is either a mark or a space, so 2 pulses makes a complete square wave cycle. | |||
Pilot tone: before each block is a sequence of 8063 (header) or 3223 (data) pulses, each of length 2168 T-states. | |||
A '0' bit is encoded as 2 pulses of 855 T-states each | Sync pulses: the pilot tone is followed by two sync pulses of 667 and 735 T-states resp. | ||
A '0' bit is encoded as 2 pulses of 855 T-states each. | |||
A '1' bit is encoded as 2 pulses of 1710 T-states each (ie. twice the length of a '0') | A '1' bit is encoded as 2 pulses of 1710 T-states each (ie. twice the length of a '0') | ||