Thread: GCR encoding
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Old 22 September 2018, 14:54   #32
ross
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Quote:
Originally Posted by Toni Wilen View Post
http://www.classiccmp.org/cini/pdf/A...pple%20DOS.pdf has very good low level description of this sync method (chapter 3).

Unfortunately implementing this sync algorithm still won't fix it: When loading first bit to 8-bit shift register, skip zero bits. $CC bit pattern is never found.
wow, this is MUCH better than Abacus description!
And on page 3-8 there is a sync mechanism that's practically the same I've guessed.
So two thing:
- some sync bits are inserted in DMA write like you supposed (and you need a real Amiga GCR write to confirm this)
- the track extraction is faulty (and maybe the kryoflux dump ca be handy)
There can be another reason.. Paula do not do Apple GCR Sync.. but in the Amiga manuals there is written like this.
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