Re: Fast GCR decoding?

From: silverdr_at_wfmh.org.pl
Date: Tue, 15 Jan 2013 15:41:56 +0100
Message-Id: <9309FE7D-F7B1-4AB5-95A3-3252482A7389@wfmh.org.pl>
On 2013-01-15, at 15:23, Michał Pleban wrote:

> Hello!
> 
> silverdr@wfmh.org.pl wrote:
> 
>> According to my count 186 cycles, although the answer is somewhat more difficult than that: I /would/ need 186 cycles, provided that I would read the incoming bytes off the VIA and be able to decode them on the fly (and the routine is bug-free :-). Since with 40+ cycles on most bytes I can't do it on the fly, I need to read/decode off-the buffer. That would add cycles and put me in the range of 200+ cycles, which is about the same as what 1571 routines do off the buffer.
> 
> Ah OK, I thought you meant 40 cycles for the whole 5 bytes, which is
> obviously impossible :-) With 186 cycles for a 5 byte buffer, that means
> 37 cycles per byte, which should not be that hard? Let me think it over
> the next days ;-)

Gladly :-) Anything that can be faster than that is a winner here! I still have to analyse the nitrox loader, for which I obtained sources recently. It was the fastest pure software loader using standard CBM format.

-- 
SD!
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Received on 2013-01-15 15:00:40

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