From: MagerValp (MagerValp_at_cling.gu.se)
Date: 2005-11-22 14:12:43
>>>>> "MM" == Marko Mäkelä <email@example.com> writes: S> - Optimised the new GCR conversion routines (about 3s gain). With S> this version I managed to make a 35 tracks d64image in 22.6s, which S> I believe to be a new record on the 64! Correct me if I am wrong. AT> Never heard of "15 seconds copy"? It needs 8 secs to read a disk and 8 secs AT> to write it, without verify. What's so great about 22 secs? MM> I guess "without verify" also means that the GCR data will not be MM> decoded (or checked for validity). You cannot make a sector dump MM> ("d64image") without decoding the GCR data and interpreting the MM> sector headers. Also, when writing to IDE devices, there are mandatory 400 us delays after writing to the command registers, and there's handshaking for every byte as it's written to the command buffer. If the IDE device is FAT formatted there are extra FAT writes every 4k or so (unless you keep the FAT in RAM, which I doubt here). The 1541s on the other hand can just stream bytes over the parallel cable. Apples and oranges. -- ___ . . . . . + . . o _|___|_ + . + . + . Per Olofsson, arkadspelare o-o . . . o + MagerValp@cling.gu.se - + + . http://www.cling.gu.se/~cl3polof/ Message was sent through the cbm-hackers mailing list
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