On Feb 4, 11:43, Ethan Dicks wrote:
> --- Pete Turnbull <pete(a)dunnington.u-net.com> wrote:
> > The 1772 was designed to be a plug-in replacement. The main (only?)
> > difference is in the programmed step rates.
>
> I am looking at a WDC-1772. It has 28 pins. Doesn't the 1770 have 40
pins?
No, you're thinking of a 1790. 1770 and 1772 are both 28-pin devices.
There's also a 1772-2 which is just a mask revision of the 1772, and a
1772-2-2 which can run faster. Ataris sometimes have the latter.
> The standard 5.25" drives _do_ use GCR for all native formats, but the
later
> stuff (1570/1571) also do MFM for CP/M compatibility. The aforementioned
1581
> is a 3.5" device (~720K; the not-released 1591 was ~1.44Mb) and does have
some
> form of MFM-capable chip, AFAIK. You can read 1581 disks in other
machines,
> Linux included, I think.
I didn't know that. Did Commodore machines use a standard controller to
write the MFM, or did they use the same techniques as for the GCR? I know
Amigas can read/write DOS disks, but they don't have any sort of standard
controller.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
In going through and sorting my piles of classic ICs, I ran across this Western
Digital WD2793A chip. What is it?
Thanks,
-ethan
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--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote:
> On Feb 3, 22:53, Glenatacme(a)aol.com wrote:
>
> > Sadly, the WD1770 fcd IC in my home-brew fd i/o board finally gave up the
> > ghost.
> The 1772 was designed to be a plug-in replacement. The main (only?)
> difference is in the programmed step rates.
I am looking at a WDC-1772. It has 28 pins. Doesn't the 1770 have 40 pins?
> > Also, I understand that the C64 floppy drives (1581?) used the 1770 but
> > I'm not a commie and can't immediately verify this.
>
> I'd be surprised if so. I thought all Commodore micros apart from their
> ill-fated PCs used GCR.
The standard 5.25" drives _do_ use GCR for all native formats, but the later
stuff (1570/1571) also do MFM for CP/M compatibility. The aforementioned 1581
is a 3.5" device (~720K; the not-released 1591 was ~1.44Mb) and does have some
form of MFM-capable chip, AFAIK. You can read 1581 disks in other machines,
Linux included, I think.
-ethan
=====
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Well, beside the anoying new headers there's still a CC-life
(Ommmm :). As of my last stopover in the new world, I aquired
a Tandy DT-1. Quite a cute pice of hardware.
For the uninformed (as I have been until someone offered it to
me via mail) it's basicly a Tandy Model III/IV case build as a
Terminal. The Keyboard is a bit different labeled (of course),
and the latch closing the empty FD slots is different than the
one used on FD less M3/4 (suprise).
Mine is working fine (except the A key), I just miss any kind
of documentation at all. I'd apreciate any hint where to find
more info or maybe manuals. A quick web search turned nothing
up.
Gruss
H.
A missing Reply-to header is a fool proof way to loose contact with your friends.
This guy has an IBM 5360 (huge beast) to give to a good home. He also
wants to trade PDP and VAX stuff. Please reply directly to the
original sender.
Reply-to: cureau(a)pcstarnet.com
---------- Forwarded message ----------
Date: Fri, 04 Feb 2000 08:41:03 -0500
From: Chris Cureau <cureau(a)pcstarnet.com>
To: sellam(a)siconic.com
Subject: IBM parts to donate
Hi there. :-)
I've got an IBM 5360, a 5224 printer and two 5291 terminals with
keyboards. If you're interested, please let me know...
I'm also looking for a few parts for projects I'm working
on...specifically from PDPs and MicroVAXen. If you'd like to trade, let
me know. :-)
Cheers,
Chris Cureau
Pumpelly Oil Company
(337) 625-1117
Sellam International Man of Intrigue and Danger
-------------------------------------------------------------------------------
Looking for a six in a pile of nines...
VCF Europe: April 29th & 30th, Munich, Germany
VCF Los Angeles: Summer 2000 (*TENTATIVE*)
VCF East: Planning in Progress
See http://www.vintage.org for details!
On Feb 3, 20:16, Allison J Parent wrote:
> I had to edit the header again, or this reply would have gone to Eric.
>
> I checked what the mailer(RFDmail) at home does... Same thing it did
> before. The last FROM: address it sees is the assumed reply address.
In compliance with RFC 822. About the only thing that can legitimately
override that is a "Reply-to:". I wonder why no-one has thought of simply
swapping the "Sender:" and "From:" headers?
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
--- James Willing <jimw(a)agora.rdrop.com> wrote:
> Well... while I don't have one (tho it would look kool next to my '029)
You have an 029? I've got an 026 that is in need of some cleaning/adjusting.
Have you ever gone through the process? When we fire it up, not all the
right things happen when feeding a card from the hopper.
Where do you get your punch cards from? I know you can still order them,
but I don't want to buy 10,000 cards at a time. I'm thinking more like
a few hundred at a time, and a few colored cards for dividers.
Also, do you have a set of the leaf-spring force measurement thingies? I
need to aquire a set for the 026 and TTY adjustment, and have no idea where
to buy them.
Thanks,
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
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