Re: Fast GCR decoding?

From: Groepaz (
Date: 2005-11-08 10:09:17

On Tuesday 08 November 2005 09:16, Spiro Trikaliotis wrote:
> Hello MV,
> * On Mon, Nov 07, 2005 at 11:29:11PM +0100 MagerValp wrote:
> > >>>>> "ST" == Spiro Trikaliotis <> writes:
> >
> > ST> in the 157x, there are other functions than in the 154x which are
> > ST> table driven. These are much faster.
> >
> > The problem with table based routines are that they're hard to fit in
> > the 1541's RAM - only 1.25k are available if you don't replace the
> > 1541's kernal routines.
> Yes, that's right. Anyway, silverdream did not tell us if he wants a
> general solution or not, thus, I gave him something better.
> Another thing to consider: It might be worth to transfer raw GCR data to
> the C64/C128/whatever and do the decoding there. The disk can read in
> the next track while the decoding is done on the computer. The overhead
> of transferring more data (320 byte vs. 256 byte) might be less than the
> time you gain by moving the decoding into the computer.
> This scheme is also used with the "warp" routines of
> SC/cbm4linux/cbm4win.

the action replay loader does the same :)


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