Looks like the Albuqurque Altairs are coming
out of the woodwork. There is now a 680 and
a 680b to go with the 8800bt.
If anyone was monitoring the auction of the
680 a couple of weeks ago which did not meet the reserve
price of $2500 - thought you might be interested
to know that it was bought by a buyer in Italy
after the auction. The purchaser bought it only
to trade for an original 8800 which he has done.
It will be interesting to see what happens with
these 680's currently up for auction. It appears
that the eBay bidders are not very aware of the
scarcity of the 680 and are consumed by the hype
surrounding the 8800.
Bob Wood
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I realized something, even if I do get this working, I'm going to need to
partition one of the ESDI hard drives since they are to big for RT-11,
according to the WQESD controllers documentation the partitions need to be
30Mb or smaller. My smallest ESDI drive is 150Mb.
How do I go about partitioning the drives? Unfortunatly my Doc set is for
V3, so I can't RTFM on this one.
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)ix.netcom.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.dragonfire.net/~healyzh/ |
On Oct 14, 18:28, Zane H. Healy wrote:
> Subject: RE: RX50 / RX33 Questions related to PDP-11's
> >What exactly do your "RX33's" do when you try to access them?
>
> They flicker briefly just prior to the machine complaining it can't boot.
> I'm not sure I had them connected properly. I'll try the method Allison
> suggested in a little bit.
That sounds suspiciously like what the controller does to "sniff" an RX50.
There's a bit of majic between the side select and track zero signals on
an RX50, which the controller uses to test that it's a real RX50.
> Well, the stickers are pretty hard to read, but if I'm looking at the
right
> two, they both say
>
> LMB617 or LM8617
> then one says 21725 or 217E5
> I'm pretty sure the second says 216E5
That's 23-216E5 and 23-217E5, the first version of the RQDX3 code. The
second revision is 23-244E5 and 23-245E5, which I think does support RX33s.
The 23- means a ROM and the E5 means 16Kbytes (ie a 27128 EPROM).
> If these aren't ROMs that support RX33's which ones should I be looking
> for, there is a chance one of my other RQDX3's that I've got in my spares
> will work.
There was a third version, which was a minor bugfix, 23-285E5 and 23-286E5.
I'm looking for a copy of those for my archive...
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
< I am almost sure you need a cable without the PC-twist. Also, you
< probably need to set the drive select jumpers properly (Can somebody tel
< us what to?). Remember that the PC-twist not only swaps over 2 of the
< drive select lines, it also gives separate motor on signals for the 2 dr
The "twist" cable only applies to PC or systems using PC patterned
interfaces. It DOES NOT APPLY TO RQDX and distribution boards used in
Qbus systems.
RQDXn uses a single bussed motor on and drive selection by drive select
jumper.
If you use a RX33 drive try using only one for starters, that will lower
the sillyness factor. If you media is RX50... why not use an RX50.
If all else fails and your configuring a second system move the controller
that works over to the target or move the target controller to the running
system as a second drive/unit.
Allison
RX33's use a straight cable without the PC twist. I have several here but
use only one at a time on my test beds. I have several from various pieces
of DEC equipment and they all use the drive select jumpers with a straight
cable.
Dan Burrows
dburrows(a)netpath.net
-----Original Message-----
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Thursday, October 15, 1998 5:58 PM
Subject: Re: RX50 / RX33 Questions related to PDP-11's
>
> >What exactly do your "RX33's" do when you try to access them?
>
> They flicker briefly just prior to the machine complaining it can't boot.
> I'm not sure I had them connected properly. I'll try the method Allison
> suggested in a little bit.
Do the drive spindle motors ever run? You can't read data from a disk
that's not spinning.
I am almost sure you need a cable without the PC-twist. Also, you
probably need to set the drive select jumpers properly (Can somebody tell
us what to?). Remember that the PC-twist not only swaps over 2 of the
drive select lines, it also gives separate motor on signals for the 2
drives.
-tony
There's a working SWTP 6800 machine on Haggle Online, complete with a doc
set. Of course, since it's an Internet auction, he wants $1000 for it, but
just in case someone's interested.
http://www.haggle.com/cgi/getitem.cgi?id=201793143
Paul Kearns
paulk(a)microsoft.com
>I am almost sure you need a cable without the PC-twist.
Absolutely correct.
> Also, you
>probably need to set the drive select jumpers properly (Can somebody tell
>us what to?).
There's absolutely no need to guess on this subject - Terry Kennedy has
collected a great amount of wisdom and experience on this subject in
THIRD-PARTY-DISKS.TXT, a compendium of DECUServe conferences,
available by anonymous ftp from ftp.spc.edu.
The answer for the drive select jumpers is easy: first drive at DS0,
second at DS1. The jumpers selecting motor speed control are a bit
more complicated; Terry's collection of data covers several popular
Teac drives, and if the answer isn't there browsing through the
Teac jumper setting recommendations will quickly give the answer
for any specific drive they've sold. Teac's faxback service is at
+1 213 727 7629, and is a valuable source of technical data regarding
the various drives and options they've produced (and still produce.)
Tim.
Is that a separate cable channel, or what (specify)?
>
>
>The CNET producer who did the coverage of VCF 2.0 has sent me the
>following:
>
>The piece on the festival is going to air this weekend on CNET Central.
>Check out http://cnet.tv.com for airtimes...
>
>Sellam Alternate e-mail:
dastar(a)verio.com
>-------------------------------------------------------------------------------
>
> Coming in 1999: Vintage Computer Festival 3.0!
> See http://www.vintage.org/vcf for details
> [Last web page update: 09/28/98]
>
>
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Hello All,
Who can help me with a pair of RL01/RL02 slides and the 4 brackets?
I want to mount my 3rd RL unit in the cabinet but don't have a 3rd
pair of them.
A payment can be discussed.
Thanks,
Ed
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