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Analogue Nagravision (Syster) encoder
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<blockquote data-quote="neo7530" data-source="post: 1079473" data-attributes="member: 414392"><p>[USER=410643]@fsphil[/USER] how about this?:</p><p>important note:</p><p>each byte of a line is equal to the XOR of the same bytes of each of the</p><p>4 other lines of the same group (49, 02, 15, 5E, 73) or (A1, EA, FD, B6, 9<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /></p><p>possible correction from the procedures 15-FD, and 73-9B hence the presence of bytes of</p><p>filling that serve no purpose other than correcting any error.</p><p>In the decoder there are 2 buffers of 210 bytes. one is in use while the other is</p><p>filled on arrival of Ltxt. The address of the buffer in use is stored in a register</p><p>named here pBuf.</p><p>Each buffer behaves like a sequence of 210 bytes in use, and as a</p><p>following 10 lines of 21 bytes during loading.</p><p>I have (arbitrarily) divided according to these 10 lines, each called according to the indicative of the</p><p>line she receives.</p><p>The pairs of Ltxt are loaded in the reverse order of their arrival, ie the</p><p>73-9B couple is loaded down the buffer, and the last couple received is 15-FD.</p><p></p><p>Maybe this is the issue that some decos are unable to hold the sync?</p></blockquote><p></p>
[QUOTE="neo7530, post: 1079473, member: 414392"] [USER=410643]@fsphil[/USER] how about this?: important note: each byte of a line is equal to the XOR of the same bytes of each of the 4 other lines of the same group (49, 02, 15, 5E, 73) or (A1, EA, FD, B6, 9B) possible correction from the procedures 15-FD, and 73-9B hence the presence of bytes of filling that serve no purpose other than correcting any error. In the decoder there are 2 buffers of 210 bytes. one is in use while the other is filled on arrival of Ltxt. The address of the buffer in use is stored in a register named here pBuf. Each buffer behaves like a sequence of 210 bytes in use, and as a following 10 lines of 21 bytes during loading. I have (arbitrarily) divided according to these 10 lines, each called according to the indicative of the line she receives. The pairs of Ltxt are loaded in the reverse order of their arrival, ie the 73-9B couple is loaded down the buffer, and the last couple received is 15-FD. Maybe this is the issue that some decos are unable to hold the sync? [/QUOTE]
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Analogue Nagravision (Syster) encoder
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