There is a PDP11/70 for sale on ebay, item number 331537471267
Sure is nice looking and expensive...
It seems to have a lot of boards and such, but no disk drive, what gives?
Disclaimer: I am not the seller, nor do I have connection. Just a gawker.
I just completed the design of my PiDP-8, a kit replica of the venerable PDP-8/I, after exhibiting the prototypes at the VCFeX.
Now, I'm gearing up to produce a batch of kits, and I'd like to collect expressions of interest in the coming two weeks.In other words, see how much interest there is, so I can determine parts volume and exact cost.
-> Kit will cost no more than $135, hopefully a bit less (depends on volume!)-> Shipping will be $30 worldwide, as registered parcel with tracking
-> Expected shipping date is mid-July, payment required only when kits are done-> Expression of interest means you're not committing to buy now, just indicate you're very likely to buy in early July.
For details, here is a short Youtube demonstration:https://www.youtube.com/watch?v=5hyUActgT2E
If you are (seriously) planning to buy the kit, please add your name to the mailing list via the box on this page and I'll update you on progress:http://obsolescence.wix.com/obsolescence#!pidp-8-get-one/ctny
If you already got an email from me today (or you registered your interest just today), then you're already on the list - in which case please ignore this message.
> From: Josh Dersch
> it never occurred to me to just try flipping it around since usually
> that's a pretty good way to let the magic smoke out of things.
Exactly. Except for cases where I _know_ the connector was designed to be
able to withstand being plugged in backwards (e.g. IDE), I would _never_ try
reversing a cable 'on spec'. The chances are just too big one will kill
(Amusing factoid: QBUS cards have the same thing, they are designed so that
you can plug them in backwards, and not kill things. I am somewhat ashamed to
admit that one one occasion, I actually did this! Luckily the engineer who
did the QBUS saved my behind.)
> From: Johnny Billquist
> On 2015-04-27 00:50, Mike Ross wrote:
>> One does not casually reverse the installation of cables just to see
>> if maybe it will work!
> Actually.... I often have done so, just because of this.
And how many times have you melted something down, doing that? :-)
I have a friend preparing to bring one of these up in a small system (2
wide) backplane with an M7676 standalone pdp 11 card.
Anyone have any experience with configuring these? Looks like the
monitor is going to be a 9" Ball brothers monitor, not sure what else.
Documentation is plentiful, but options are also complex, so someone who
has one working, or any experience would be welcome to comment.
> From: Jorg Hoppe
> I also have a spare DL11-W to offer
Josh, if you want a second serial line, it's best to use a regular DL11
(M7800), not a DL11-W. (M7800s are available on eBay, for pretty modest
amounts.) The reason is that each DL11-W presents a load on the line clock
signal (from the power supply), even if the line clock on the second board is
disabled; several Dl11-W's, and the line clock signal may get overloaded.
> From: Josh Dersch
> I need to scare up a second SLU so I can get an emulated TU-58 hooked
> up to try booting XXDP
I'm not sure any M9301 variant supports the TU-58? Some are set up to boot
over the console serial line, though. (I haven't yet checked the code, so I
don't know whether you need to feed it the absolute loader first, or if it
will just take .LDA files directly.)
And I just realized you're working with a -YB, and I've been dis-assembling
the -YA! Fat lot of use that would have been! Oh well, I assume the code is
fairly similar, I'll do the -YB next. (Anyone have a dump, to start me off?)
> comparing the diagnostic/console PROM listings to what I have
Where were those from? Thanks in advance...
> From: Henk Gooijen
> I could be wrong, but ISTR that in the first few words of a ROM are the
> two capitals of the boot device that the PROM supports.
Not in the M9301-YA, in either bank.
just received some Unibus boards, some are from ACT, one from CMI.
I would identify these boards.
The first is a big hex board, marked ACT 10046: on front side has two
plus two female edge connectors on the left side (some sort of narrow
There are some resistive terminators onboard near one of the 50pin
Very strange board...
The second is a quad board marked ACT 10039: it has four 40pin connectors,
two on front and two on a side.
The last is for sure a RAM board, as it includes an array of 16x9 HM4716
ICs, with a total of 128KW.
It's from CMI ON 207-010-300 and it has a lot of wire-wrap jumpers for
Anybody has some knowledge over these boards?