1771 floppy controller questions

From: Allison <ajp166_at_bellatlantic.net>
Date: Tue Nov 20 15:22:21 2001

Yes, I have a few of them. the part is nearly the same as the 372
with some minor tweeks and differences.

Allison

-----Original Message-----
From: Richard Erlacher <edick_at_idcomm.com>
To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
Date: Tuesday, November 20, 2001 3:27 PM
Subject: Re: 1771 floppy controller questions


>Yeah ... I wasn't sure about that, though I know they sold their
Intel-numbered
>version of the WD HDC chips (1010 and 2010).
>
>Didn't NEC also make a uPD371 that was for small tape drives? I know they
made
>something on that order, but I never got to play with them.
>
>Dick
>
>----- Original Message -----
>From: "Allison" <ajp166_at_bellatlantic.net>
>To: <classiccmp_at_classiccmp.org>
>Sent: Tuesday, November 20, 2001 10:56 AM
>Subject: Re: 1771 floppy controller questions
>
>
>> Intel never did a 1771 compatable chip. They did do the 8271 that was
>> FM only but totally incompatable with the 1771 socket.
>>
>> The second source that did ship parts is SMC. The other supplier was
>> National Semi.
>>
>> NEC Started with the D372, that was a hard/soft sector single density
>> controller that did find it's way into the first version of the IMSAI
floppy
>> controller.
>>
>> Allison
>>
>> -----Original Message-----
>> From: Richard Erlacher <edick_at_idcomm.com>
>> To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
>> Date: Tuesday, November 20, 2001 12:05 PM
>> Subject: Re: 1771 floppy controller questions
>>
>>
>> >I don't know right offhand of any second sources, except for Intel,
which
>> did,
>> >IIRC, make a 1771-equivalent/compatible for a time. They went the NEC
>> route
>> >when MFM became popular, however.
>> >
>> >WD also made a 1781 which was M2FM capable, and, as some folks will tell
>> you,
>> >THAT's a hard modulation scheme to support.
>> >
>> >As I mentioned before, it might be worthwhile to communicate with Tony
>> Duell
>> >regarding the expansion interface, as he recently admitted he'd actually
>> made
>> >the model-1 disk interface work as it was designed to work. A lot of
>> folks
>> >couldn't get reasonable reliability until they bought a third-party
>> enhancment
>> >for the floppy interface.
>> >
>> >Dick
>> >
>> >----- Original Message -----
>> >From: "Tothwolf" <tothwolf_at_concentric.net>
>> >To: <classiccmp_at_classiccmp.org>
>> >Sent: Tuesday, November 20, 2001 8:51 AM
>> >Subject: Re: 1771 floppy controller questions
>> >
>> >
>> >> On Tue, 20 Nov 2001, Richard Erlacher wrote:
>> >> > From: "Tothwolf" <tothwolf_at_concentric.net>
>> >> > > On Tue, 20 Nov 2001, Richard Erlacher wrote:
>> >> > >
>> >> > > > What is it that makes you believe that the 1771 s the problem?
>> >> > >
>> >> > > Well, I accidentally plugged the chip in backward when
>> troubleshooting the
>> >> > > floppy interface right after I got it. It turned out that the
floppy
>> >> > > ribbon was bad, just due to age I guess. I don't think the chip
let
>> out
>> >> > > its magic smoke, but it certainly does not work now ;)
>> >> >
>> >> > OK ... I can believe you'd reach that conclusion from what you
>> describe.
>> >I've
>> >> > done that on one of those "late nights" on more than one occasion.
>> It's
>> >> > reasonable to assume the part is toast, given that there are several
>> >supplies,
>> >> > each of which has been applied to the wrong pins. Too bad ...
>> >>
>> >> I'm really not too worried about it, since the 1771 does seem to be
>> >> available and I have the technical reference book for the expansion
>> >> interface. I don't think there are any unusual or proprietary chips
used
>> >> in the expansion interface with the exception of the floppy
controller.
>> If
>> >> it took out any other logic chips with it, I should be able to replace
>> >> those easily.
>> >>
>> >> It appears that my local vendor may have just assumed the part he has
in
>> >> stock is a National, since I can't find any references to National
ever
>> >> manufacturing a 1771, and the -B01 is a WD suffix.
>> >>
>> >> -Toth
>> >>
>> >>
>> >
>>
>>
>
>
Received on Tue Nov 20 2001 - 15:22:21 GMT