PDP-11/04 on Ebay - whats wrong with it?

From: Andreas Freiherr <Andreas.Freiherr_at_Vishay.com>
Date: Tue Feb 25 04:25:00 2003


the 0002777 vs. 000277 question is easy: the display has only six
digits, so the last digit is obviously a typo. My 11/34 has the same
programmer's console front panel, so I can be sure about this one. The
display may show random digits after power-on, but should respond to the
CLR and digit keys in an obvious way.

The pictures look like a machine in fairly good shape, but something may
have been removed: there should be a terminator card in the last UNIBUS
slot, or a cable to connect to the next backplane. I cannot see either
of them in the pics (the slot is visible in one of the photos, but
empty), so I assume there may have been another backplane in the box
which was removed. Another indication for this is that there is no
peripheral controller listed, other than the KY11-LB (front panel) and a
DL11-W (console terminal). Not a major problem, but an indication that
you'll need to do something more than just turn power on and use it.

The seller offers to do tests on request, so you might ask him to
deposit values in memory and then examine, using the octal keyboard on
the front panel: this could verify some basic functionality and reduce
your risk. E.g., deposit 122222 and 055555 in adjacent locations, then
load the first address again and examine both words.


Kane, David (DPRS) wrote:
> Hi,
> A PDP-11/04 on ebay
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=1247&item=3403225
> 748&rd=1
> I have to start by stating I am in Australia. Our dollar might have
> crept back up to a smidgen over 60 cents US today, but the opening bid
> on the PDP will still be considerable, then add international shipping
> and ooooooh ouch. But despite all that I am still toying with the idea
> of bidding on the item. I do need a little assistance before making a
> definitive decision. For those unaware the item was listed before
> recently but was passed in unbid. I did not get interested last time
> since the description did not list a CPU card, and the seller did not
> reply to an enquiry regarding a CPU card. I notice that this time there
> is a CPU card listed (M7263). My quandary is over the seller's comment
> that the "Unit powers up and reads 0002777" although the pictures have
> it reading 000277. My worry is that the unit is severely broken. Can any
> take a stab at guessing what might be wrong, is it possibly just the
> lack of a boot device (floppy of hard disk)?
> David Kane

Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
Received on Tue Feb 25 2003 - 04:25:00 GMT

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