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 - 14:02:12 GMT