Re: Fast GCR decoding?

From: silverdr_at_wfmh.org.pl
Date: Mon, 14 Jan 2013 14:25:35 +0100
Message-Id: <58035208-8725-4035-BBDF-E5217A8BFE7C@wfmh.org.pl>
On 2013-01-14, at 12:44, Groepaz wrote:

> the only solutions i remember that 
> worked faster than 2 revolutions used a parallel cable and did decoding on the 
> c64 while the 1541 does reading

I am fine with this approach too. Just would like to be able to decode the whole track in real time (if possible). Either in the extra 8KiB of RAM in the floppy or on the 64.

> (the infamous 15sec copy for example)

If we are talking about the same 15 sec copy, then it didn't decode the GCR. It cached the GCR data and sent it back for writing.

Besides - the 64 runs at roughly the same speed as 1541. How can it do the decoding in real time if 1541 with extra RAM can't? I mean it has the same time _between_ the GCR bytes coming off the 1541 as the 1541 has between them coming off the VIA. Yes, there is the  BVC overhead in the floppy but that's not enough, is it?

-- 
SD!
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Received on 2013-01-14 14:00:03

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