I have some doubts that the daughterboard from Denver Business Systems (now
defunct, methinks) that I have does nothing to help support 5-1/4" drives. Now,
I'm not familiar enough with the 820 boards that BG Micro distributed to know
whether they supported the mini-floppies.
Dick
----- Original Message -----
From: "joe" <rigdonj_at_intellistar.net>
To: <classiccmp_at_classiccmp.org>
Sent: Thursday, June 28, 2001 7:29 PM
Subject: Re: Xerox 820
> At 12:35 PM 6/28/01 -0600, you wrote:
> >I'm not sure where they are, at the moment, but I have a couple of
> >daughterboards that fit via cable into the 1771 socket but allow the use of a
> >179x device for double-density recording. I'm not at all sure that the
> >2.5 MHz
> >Z80 can manage the data transfer rate for DD 8" diskettes, but it's possible
> >that there's an associated update for the CPU that makes it
> >possible. OTOH, DS
> >5-1/4" diskettes benefit greatly from DD recording. Unfortunately, I haven't
> >seen the one-page doc that goes with those boards in a long time, and I've
> >never
> >seen the software update to support DD diskettes.
> >
> >Dick
>
>
> FWIW Those devices are probably used to update an 820 to an 820-II.
> I'm not sure about the 820 but the 820-II supported both 5 1/4" and 8"
> disks. The 820-II could format the 8" disks as SS-SD, SS-DD, DS-SD or
> DS-DD. But the 820 only supported single density disk (SS or DS). On the
> 820-II the DD 5 1/4" disks held 155k or 322k (single or double sided) and
> the 8" DD disks held 482k or 980k (single or double sided).
>
> Joe
>
>
> >----- Original Message -----
> >From: "Steve Robertson" <steven_j_robertson_at_hotmail.com>
> >To: <classiccmp_at_classiccmp.org>
> >Sent: Thursday, June 28, 2001 11:54 AM
> >Subject: Re: Xerox 820
> >
> >
> > > >Thousands of these were sold as bare boards with limited doc's. I
> > > >frequently ran into folks using them, yet never saw one in the original
> > > >Xerox enclosure. The Xerox box was just too expensive. Once they were no
> > > >longer a major product, they were surplussed out as bare boards. I
> > think it
> > > >was through BG Micro.
> > > >
> > >
> > > I got several of the bare boards in a lot of XEROX stuff that bought
> > several
> > > years ago. Haven't looked in those boxes in a long time but if I recall
> > > correctly, the DOCS were *minimal*.
> > >
> > > If someone really wanted them, I'd be willing to part with the boards.
> > >
> > >
> > > SteveRob
> > >
> > >
> > >
> > > >----- Original Message ----- From: "Rich Beaudry" To: Sent: Thursday,
June
> > > >28, 2001 9:12 AM Subject: Xerox 820
> > > >
> > > >
> > > > > Hello all, > > Recently I acquired a Xerox 820, but as a single board,
> > > >w/ power supply. I > also received many docs (including a tech manual
with
> > > >Monitor listings and > schematics). I know originally these were
> > > >"all-in-one" computers, but many > appear at ham fests in exactly the
same
> > > >shape as mine -- as a single board > computer.
> > >
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at http://explorer.msn.com
> > >
> > >
>
>
Received on Thu Jun 28 2001 - 23:25:06 BST