On 2013-01-13, at 07:30, Groepaz wrote: >> Is there anything known that would be still faster? AFAIU ProfessionalDOS >> does it faster but with help from its hardware. Anyone heard of faster >> than 1571 but pure software based decoding? > > thats basically just an eprom with an huge lookup table though (the cbm dual > drives do it in a similar way) Like putting bits on address lines and reading the outcome from data lines? It could be an option, depending on how "huge" the table has to be... It can't be 40 bits so some bit fiddling has to be done anyway. Also I found a post by Jim Drew on Lemon64, where he admitted to have decoded GCR in real time thanks to extra RAM on the SC+ card and "creative tables". Since he's got "only" 8K of extra RAM, he had a hard limit on the size of the table. If I fit into 8K and have GCR decoded in RT I can't have any more wishes ;-) How is it done in dual drives? -- SD! Message was sent through the cbm-hackers mailing listReceived on 2013-01-13 17:00:10
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