Re: 1571CR chip and ZoomFloppy

From: Nate Lawson <>
Date: Sun, 11 Dec 2011 13:11:56 -0800
Message-Id: <>
On Dec 11, 2011, at 12:40 PM, Segher Boessenkool wrote:

>>>> Supposedly they also did an 852x that has only the low four ports (or
>>>> the rest is not functional, anyway), i.e. the two parallel ports only;
>>>> it was called something like 5210 (I forgot the exact name, and cannot
>>>> find it anymore).
>>> 5710 if I remember right.
>> The 5710 from the 128DCR (and 1571CR)?
> That's the one.  Pretty obvious how they came up with that chip name,
> heh :-)
>> That's more than a stripped-down
>> 6526, as it also contains "an equivalent" (well, or so...) of the
>> WD1770/1772 for MFM access.
> Ah, that makes a lot more sense, thanks for the info.

This reminds me. Has anyone tested the 1571CR in a 128DCR with the ZoomFloppy? In particular, I'm wondering if the fast serial nibbling mode (nibread -s) works with that drive.

This is important because this drive can't support the normal parallel port because that part of the 6526 was removed. But it should work with the 2 Mhz SRQ burst mode if that part of the chip wasn't limited during cost reduction.

Let me know if you have any test results.


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Received on 2011-12-11 22:01:44

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