Re: 'Frankenstein' Disk Drives, Done Cheap

From: Nate Lawson <>
Date: Sun, 4 May 2014 16:01:33 -0700
Message-Id: <>
On Apr 25, 2014, at 11:22 AM, Ingo Korb <> wrote:

> "smf" <> writes:
>> I guess commodore dropped the ball again as the 1571 connected to a
>> zoomfloppy can run really fast.
> As far as I can tell from occasional postings on various forums, the
> Zoomfloppy/1571 combination seems to suffer from reliability problems
> and the usual advice given is to use a very short, high quality
> cable. Therefore it appears that Commodore did not "drop the ball again"
> but instead chose reliability over speed, which most sane companies
> would do in this situation to reduce support costs and to avoid the
> impression that their products are unreliable. 

I’m not aware of problems like that. 1571-NIB-SRQ mode is surprisingly robust, though I have heard even d64copy fails with some people’s home-made cables.

I believe Commodore chose implementation speed over “getting it right”. They took the 1541 ROM and just patched the code in various places to implement the new 1571 features. To utilize the full speed that we do, C= would have had to implement GCR decoding on the C128 side or add extra hardware to the drive.

Since Steve Berlin had no time to make such wide-ranging changes to the protocol, he stuck with something that was a closer variant of prior behavior. For another example, look at 1571 write performance. There’s no SRQ-burst mode even though they could have done that because it would require more changes to interleave, GCR encoding, etc.


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Received on 2014-05-04 23:05:15

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