Allison, I'll have to show you the machine... maybe you could
identify the drive right off without having to open the case.
For a preview, check out the wired.com article pictures...
Former RT-11 Developer
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
| Unix Support Engineering Group | (home): mbg!world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of '!' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg KB1FCA |
The Alpha was started by DEC in 1988 as a replacement for the VAX, it
extends the address space to 64 bits and switches from a CISC architecture
to a RISC architecture.
I've got a copy the Alpha Architecture Reference Manual (AARM) and the
Alpha Architecture Handbook (AAH) which combined give you everything you
need to know about the Alpha.
I'd like to offer them in trade to anyone who has EITHER:
KA640 Technical Manual
KA680 Technical Manual
Also published by Digital.
This might be of interest to somebody here (hopefully)...
Surplus Traders (www.73.com) currently has 35 Nabu computers for $29.00
a pop, plus shipping. Normally they do bulk sales, but they will sell
the Nabu individually. (Search for item CR356.)
I picked one up a while ago, and mine was still 'new', in the box, with
a factory seal. Then again, since this surplus, it might be best to
verify that the units are 'new' if that's important to you.
Unfortunately, I haven't really toyed with the Nabu hardware too much
(yet), and if anyone else has, I'd love to hear about it. Either way,
these machines are certainly an interesting part of computing history.
Here's a small blurb about the Nabu:
(And Tony Duell :^)
Have a friends Decstation 5000 power supply with a violently blown fuse.
He is a developer of VMS Freeware (in fact the WASD web server) and has
asked me to help.
Culprit is 2 x ZNR 14K241U devices, which I believe are Metal Film
Varistors Surge Absorbers.
The numbering system seems to be obsolete as current ZNR Surge Absorbers
use a quite different system, or I've guessed wrong and they are
something else entirely, but I don't think so.
These two gadgets are wired in series with each other, then connected
across the output of the mains rectifier.
240vac in, so they are across around 300+ vdc.
I could just leave them out and the supply will run, but would much
rather replace them to keep the protection they offer.
Their appear to be no other faults and the history of the incident is
consistent with a switch on surge after an extended holiday (3 weeks)
following daily useage of the machine, so it's possible the reservoir
caps may be just a little leaky or the varistor was just getting tired.
Anyone make sense of the device id so I can figure out what rating to
replace them with.
Device looks rather like a round ceramic capacitor, but gloss black in
colour, marked with white lettering
A Logo consisting of a small square box in top left with a capital M
inside and ZNR in caps next to it
then under it is 14K241U (or the 1's could be ell or i, hard to say).
underneath at bottom left is an reversed italic capital R with a
reversed italic capital L joined to the back main bar of the R.
To the right of this is a small letter s raised above the baseline with
the number 20 after it.
Any help appreciated.
Geoff in Oz
Well since it appears I'll be holding on to this calculator, and I've
verified that it does indeed work if I kludge up a battery pack. Does
anyone have a spare HP battery pack I could buy/trade for? It doesn't
particularly matter if the pack is dead, we can rebuild it :-)
I recently filled the car with these:
Apollo DOMAIN Series 3500
Domain series 3000 model 3010
HP/Apollo series 400
(2) Sun 3/60 + tape drive and tapes
Apple lisa 2
(2) apple II Ci
Mac SE/30 with radius monitor
Mac color classic
power mac 7200/90
Also available was a volker Craig terminal, and a copy
I also have "quite a pile of HP 712/715/725s in various
condition" for me to pick up when I get some space cleared.
IKEA has said that the missing piece to complete the
shelving will be delayed another 3 weeks, and my wife says
no more machines until the shelves are up!
> > > Imagine different front panels depending on which PDP11 you software
> > > configure...
> > And none of them have the feel of the real thing...
> > -tony
> Only if you miss the fan noise...
I've got to agree with Tony, my /73 in a BA123 is about as quiet as the
Sparc 20 I've run simh on, in fact I think it's quieter. Given the choice
between the two I'll take my /73 hands down! With it I've got a *proper*
terminal, not some whacked out terminal emulation (hmmm, is this when I
admit that the system console for the PDP-10 version of simh is a VT420).
Everything behaves the way it should, and I've got a better choice of disks.
On the emulator I'm pretty much stuck using RL02's, on my /73 I've got two
removable SCSI hard drives, a CD-ROM (yes, I've a bunch of PDP-11
readable CD's), and I can use FTP and TELNET under RT-11 or DECnet under
RSX-11M. Unfortunatly to get files into RSX-11M+ I've first got to boot to
RSX-11M, and copy them over (unless of course they're on CD-ROM). Oh, and
the LA75 display printer hooked up to the VT420 I use for the console comes
in pretty useful!
The only use I see for a PDP-11 emulator personally is so I can run RT-11 on
my wifes laptop when we're on vacation (and then I've got to take a blasted
external keyboard with me). BTW, that's why I'd been running simh on the
Sparc 20, I was setting up my RT-11 RL02 packs.
Where I see emulation as useful is when you need a laptop version of the
system, or you just don't have a chance of getting the hardware (and/or
don't have the space even if you could). There are also commercial
situations where using a emulator makes good business sense. Oh, the other
use, in the case of the PDP-8 emulators with front panel emulation, is so
that you can see what you should be seeing when running diagnostics on a
system you're trying to repair (when you've never used a PDP-8).
Well, even though I've already posted a couple times, I too am new to the list
and thought I'd chime in. I live and work in champaign-urbana, IL, and mostly
collect old UNIX machines -- I have a couple HP 735's, an HP 425/t, HP 300,
sun sparc 2, 5, and 20, an RS/6000, and some other crap. Oooo yeah, I got a
textronix model 31 electronic calculator recently, but haven't done anything
interesting with it yet -- I just know that it works. If anyone has tapes
for it, let me know, that would be fun to mess around with...
I've known about this list for a while, and just finally got around to signing
up a few days ago -- damn laziness :)
- Dan Wright
-] ------------------------------ [-] -------------------------------- [-
``Weave a circle round him thrice, / And close your eyes with holy dread,
For he on honeydew hath fed, / and drunk the milk of Paradise.''
Samuel Taylor Coleridge, Kubla Khan
I am new to this list, so let me introduce myself. I am interested in early
scientific and computing history. As such, I collect early computing
literature and scientific letters. I am also interested in scientific and
engineering Instruments, original and patent models, literature and
illustrations prior to the 19th century. The first computer I learned to
program was a DIGIAC 3080, followed by an early WANG (I'd love to find them
again), and then 360 assembler and PL/1. I am interested in purchasing early
scientific equipment, advertising literature, electromechanical calculators,
vintage computers (Imsai, Altair, TRS80, SOL, Digiac, Scelbi, SWTPC, PET,
and many, many others) and associated literature. I prefer working examples,
but please contact me with a description of what you have available. I'll
pay shipping costs for items of interest or pick up from most areas in the
eastern U.S. I look forward to participating on this list. Thank you for
Does anybody in the Washington DC area have an HVD SCSI setup
that I could test some drives on before I spend money on a
Alternatively, does anybody have a PCI HVD SCSI controller
that they would sell cheap (_really_ cheap) or trade for
some vintage stuff?