>> >
>> > Err, and just what _production_ PDP11s are pre-11/20??
>> >
>>
>> Gordon Bell had 300 "PDP-11" minicomputers made that were *slightly*
>> different from the PDP-11/20. Most 11/20 boards are rev "A". I will list soo
>> the differences - most had to do with the UNIBUS.. but there was some
>> changes to the datapaths as well.
>Ah, so they're not really production machines...
>
>As a user/repairer (as opposed to a collector), my views on prototype
>machines and their value is perhaps a little different to others.
You also have to keep in mind who the owner is and how much he wants to
inflate the value of his equipment. I think it's been conclusively shown
that there are at least some members of this list who are very good salesmen
(perhaps PT Barnum style), and some others who aren't so good.
Q: What's the difference between a computer dealer and a car dealer?
A: The car dealer knows when he's lying.
Tim.
Chuck,
Of course, you can always point out that with the DEC stuff, the unibus,
omnibus, posibus, negibus, and qbus all use the same connectors... realllly
different electrical signals but still the same connectors... quite handy..
Will J
________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
Hey all, I have a line on an HP-86 up for grabs in California, about 90
miles north of Sacramento:
] HP-86 with manuals, monitor, two disc drives, memory modules, matrix
] manipulation hardware (never used), etc. I have not taken a complete
] inventory of what is there. Would be happy to GIVE it to anyone that
] has an interest.
Let me know if you're interested, and I'll pass the word on.
Cheers,
Bill.
Oops, I should have made it clear that I was speaking only about WIREWRAP
boards! I did not mean to imply in any way whatsoever that you could put
unibus boards in say a negibus backplane, unless you like the smell of burnt
circuitry.. that was also the reason for my note about their electrical
signals being totally different, i.e. that unibus boards might have the same
connectors as qbus boards, but they are electrically different... Dear lord
I hope nobody cooked anything by mistake!!!
Will J
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There was a project just for this in Electronics Now or Popular Electronics
just recently. I'd say Feb. or March issue.
If I have time tonight, I'll dig-up the article. As I recall, it uses a PIC
and a group of LEDs on a pendulum to provide the date and time using the
same "persistence of vision" as mentioned below. I don't recall if the
swinging was user-invoked, motorized or magnetic.
Rich
==========================
Richard A. Cini, Jr.
Congress Financial Corporation
1133 Avenue of the Americas
30th Floor
New York, NY 10036
(212) 545-4402
(212) 840-6259 (facsimile)
-----Original Message-----
From: Marvin [mailto:marvin@rain.org]
Sent: Tuesday, May 09, 2000 11:06 AM
To: classiccmp(a)classiccmp.org
Subject: Re: Cool hack (was Busses vs no busses)
John Foust wrote:
>
> What's the name of those signs that are composed of nothing but
> a single vertical column of LEDs, where you can only see the
> image (or the digital clock display, etc.) as your eye scans
> across it, leaving the multiplexed image in your brain?
I can't recall either, but that brings to mind an interesting project a
friend of mine worked on quite a few years ago. The Art Museum here was
having some kind of show and an artist wanted to paint electronic pictures.
My friend designed the electronics (I built the circuit boards) to put a
line of LEDs on a pendulum and paint pictures electronically as the pendulum
swung through its arc. With the multi-colored and higher intensity LEDs
available today, it would be really cool to do the same thing but with color
pictures. Doesn't sound like too hard a project especially with the speed of
todays computers.
And, finally, a couple of cheapies.
RT-11 Pocket Guide, still in the shrink wrap, for Ver. 5.0. Since
I don't use RT-11, this is not very useful to me. First person to offer
$5.00 (Shipping included!) gets it.
I also have a data cable as used on the HP 262x series
terminals. It's a DCE species, HP part #5061-4216. Has the 50-pin
Amphenol 'Micro-Ribbon' connector on one end, and a female
DB25 on the other.
Same price: $5.00 (Includes shipping).
In the event of multiple responses, priority goes to the E-mail
with the earlier time/date stamp.
Thanks much!
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner/Head Honcho,
Blue Feather Technologies (www.bluefeathertech.com)
kyrrin(a)bluefeathertech.com
"SCSI Users, Unite! Beware the IDEs of March!"
Ok, here's another Haggle item at:
http://www.haggle.com/cgi/getitem.cgi?id=202308864
It's a copy of "Introduction to Programming" (DEC) that seems
to have been written around the PDP-8. The bottom of the front
cover reads "PDP-8 Handbook Series" (wazzat a clue or what?) ;-)
Starting bid is two bucks plus mailing. Help me find this one a
good home. Thanks!
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner/Head Honcho,
Blue Feather Technologies (www.bluefeathertech.com)
kyrrin(a)bluefeathertech.com
"SCSI Users, Unite! Beware the IDEs of March!"
I just posted a listing on Haggle's Antique Computers section
(I absolutely REFUSE to deal with E-pay) as follows:
http://www.haggle.com/cgi/getitem.cgi?id=202308845
It's for a stack of manuals/tapes on the HP9825 desktop
computer. Full description's at the site.
I thought about limiting the posting to the list, but I wanted to
give any of you who have a 9825, and might need the docs, a fair
crack at it.
Thanks much.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner/Head Honcho,
Blue Feather Technologies (www.bluefeathertech.com)
kyrrin(a)bluefeathertech.com
"SCSI Users, Unite! Beware the IDEs of March!"
This is being offered by a third party.
All inquiries should be made to the e-mail
near the end of this message.
-----------------------------------------------
** FOR SALE: IMSAI 8080 **
Serial Number: 1009006
Boards installed:
IMSAI MPU-A 8080 CPU
CCS Model 2422 Multimode Floppy Controller
SC DIgital Model 32K Memory board
Two memory boards, maker unknown (see pic)
Tei IO 3P+3S Serial/parallel io card
S-100 Extender board
Northstar MDC-A4 Hard-sector Floppy Controller
Documentation:
"A couple of boxes" of hardware & sofware docs.
Software:
Stack of hard-sectored diskettes, that looks like
they have the OS, and some applications on them,
couldn't tell for sure.
Package also includes:
Pair of MPI floppy drives in a hand-made
copper cadrive cabinet (see pic).
OKI Microline 82 printer
Apple pen plotter
B/W Television Set, modified for use as a monitor.
------------------------------------------------------
I looked at this stuff the other nite; it looks like a
pretty nice example of the IMSAI with its original CPU
card. It's a bit dusty inside, but cosmetically fine
otherwise. No broken paddle switches, and it comes
with the original steel top (made of boilerplate).
I've been told that there may be more items added to the
inventory, but this is what has surfaced so far. It was
working when this was put away, but hasn't been powered up
since. Actual electrical condition unknown.
Photos can bee seen at:
http://home.kscable.com/kh6jjn/imsai_front.jpghttp://home.kscable.com/kh6jjn/imsai_side.jpghttp://home.kscable.com/kh6jjn/disk_drives.jpghttp://home.kscable.com/kh6jjn/memory_board.jpg
-------------------------------------------------------
All offers/bids/whatever should be sent via e-mail
to: DENYS FREDRICKSON, at: denysgf(a)juno.com
Thank you for your attention.
We now return you to our regularly scheduled programme. . .
