Greetings,
I have two working PDP-11's(23+) that came out of a bowling alley for
sale. Here is a partial list of items from the systems:
PDP-11 Case
CPU Board
Memory Boards :
512
256
Controller Cards:
Floppy and HD
Communications boards
MFM drive not working needs parts
Floppy drive
Both can be booted into RSX? I can provide screen shots
I would like both systems to go as is in one sale. If you are interested
contact me via email.
I will be posting to eBay if no interest.
Regards
I've got several old Macs; Color Classic, plain Mac Classics, some older Apple monitors, and a couple of LaserWriters that are going to hit the recycling center unless someone wants them. Located in Lincoln Nebraska.
Nah,
A bug eyed sprite will do nicely.
If all else fails a Cincinati Milichron 2000. Extremely rare
and last I'd seen one was around '74.
Allison
>
>Subject: Re: Suggestions for a mini?
> From: Sridhar Ayengar <ploopster at gmail.com>
> Date: Wed, 14 Sep 2005 22:50:48 -0400
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>Bob Shannon wrote:
>> Cooper S, Hyper blue, with the sports package.
>
>I was thinking of saying something to the effect of "'66 Lambo Miura".
>
>Peace... Sridhar
>
>>
>> ----- Original Message ----- From: "Tom Jennings" <tomj at wps.com>
>> To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>> Sent: Wednesday, September 14, 2005 9:39 PM
>> Subject: Suggestions for a mini?
>>
>>
>>> I'd like to solicit suggestions for a mini...
>>>
>>> I have this Nova 4, http://wps.com/NOVA4, but it's taking up too
>>> much space, physical and psychic. I do want a mini-era machine,
>>> and after some thought, I worked out what I'd like to get from
>>> one.
>>>
>>> What I want is a basic stripped machine, with CRT console and
>>> high-speed paper tape reader, and a low-speed punch (this last is
>>> variable), and standlone utilities. It must have a front panel.
>>>
>>> I've used such on two platforms (Varian 622/i, Nova 1200) and it's
>>> precisely the sort of (relatively) low-maintenance, high-geek
>>> vintage experience I want.
>>>
>>>
>>> So I'd like to trade my kilopound of DG gear, documentation,
>>> tapes, fiche, etc for about 100 lbs of minicomputer.
>>>
>>> I'd prefer a DG Nova, General Automation, Varian, or other non-DEC
>>> brand. (No offense to DECcies, I have a strong preference for off
>>> the beaten path.)
>>>
>>> Even or especially one-off oddball or unpopular, or slow, or ugly
>>> machines. Off models, step-cousin machines etc. Poorly optioned
>>> (eg. math or fancy interfaces).
>>>
>>> Something like (but of course unlikely to be sucha popular model):
>>>
>>> Nova 1200
>>> 16 or 32k words
>>> tty port
>>> ptp/ptr port
>>> lpt port or equiv
>>>
>>> I have generic high-speed paper tape readers, serial interface. I
>>> don't care if peripheral brands match.
>>>
>>> It would be nice to have reel tape support.
>>>
>>> Any suggestions on interesting and obtainable machines?
>>>
>>>
>>
>>
I recently obtained a Rainbow 100 with a gaggle of
disks. The person had told me there was a complete or
nearly so set of DECUS disks included. None of them
imaged w/o errors, so I just became disgusted and gave
up. Now we know of all the semi-compatible peecees,
the Rainbow is probably the easiest to find software
for. So where is the archive that has the DECUS stuph?
And there is a set of DECUS newsletters on Ebay at
this very moment.
______________________________________________________
Click here to donate to the Hurricane Katrina relief effort.
http://store.yahoo.com/redcross-donate3/
>Date: Wed, 07 Sep 2005 12:58:30 -0400
>From: Roger Merchberger <zmerch at 30below.com>
>Subject: Re: Homebrew Circuit Boards: Methods? Supplies?
>>In fact, I have not been able to find precoated board (photoresist coated)
>>in the .050" thickness. So I will either need to use a liquid photoresist
>>or try a toner transfer system.
>
>I dunno about 0.050", but would the 1/32" thickness be close enough?
>(That's 0.03125" thickness, if you can believe the Winders calcaputer
>applet ;-)
I am building SIMMs of various sorts, so the .047" - .053"
requirement is firm. They must fit properly in the sockets.
>>Do the developer and/or stripper usually turn out to be some commonly
>>(cheaply) available chemical? I would prefer to avoid paying $6+ for a
>>small bottle if I can avoid it.
>
>One kg of ammonium persulfate will make 4 liters of etchant,
Developer and stripper are not etchant. After applying and exposing
photoresist, one uses developer to remove the unexposed (or exposed
for positive) photoresist without affecting the exposed (or
unexposed) photoresist. After etching the excess copper away with an
etchant, the polymerized photoresist is still present on the
protected copper traces and must be removed using a stripper.
So, when using a photoresist system, one needs developer, etchant and
stripper. However, I suspect that the stripper, at least, may be
some commonly available chemical such as acetone. And I believe that
Tony mentioned that developer is usually just a strong alkalai.
Thank you for the helpful information and for sharing your
experiences. The supply source and books look interesting.
Jeff Walther
Does anyone know anything about using the HP Integral modem, or have
software that's _known_ to work with it?
Today I tried the modem board (HP 82915) in my Integral. The machines
powers up OK, and the load_modem command finds it and loads the driver.
But any attempt to access /dev/modem00 (using stty, kermit (on the
super-utilities disk), etc) hangs the machine.
I decieded to do some investigating. Probing points on the I/O cards is
difficult with the machine assembled, and I don't have an extender board.
There is, however, a way to get good access to the boards, but it
involves a little work.
Remove the rear cover and rear screening plate over the logic assembly.
Unplug the 2 cables from the back of the floppy drive, remove the 3
screws and the drive itself. Remove the eject button and spring before
you lose them.
Undo the screws holding the logic chassis in place. Unplug the power
cables, HPIB cable, expansion backplane cable and HP-HIL cable from the
logic boards,Leave the other (printer) cables connected, move the logic
chssis towards the top of the machine.
Remove the HP-HIL grounding nut (through a hole in the expansion
backplane), then the 4 screws holding the PSU/expansion box in place.
Take that out
Undo all the screws and nuts holding the cover on this unit. Move the
cover out of the way
Undo the nut on the backplane earthing bracket, remove the 4 screws, the
bracket, and the backplane.
Reassmble and refit the PSU box (you don't need all the screws), plug the
cables back into the logic assembly (you can leave off the HPIB cable if
you're not using any HPIB peripherals at the time), plug in the expansion
backplane cable with the backplane hanging behind th PSU box.
Fit a couple of the logic chassis screws. Refit the floppy drive, hold it
in place with at least 1 of the top screws. Recoonect its cables.
The machine will run like that, and you can plug the expansion board into
the backplane and probe pins on it.
Now, to understand the next bit, you need to know a little about the
design of the modem.
The address decoder is simple. It responds to the slot-specific chip
select line from a decoder on the CPU board, and further decodes lines A6
and A5. It provides 4 chip-select signals
A6, A5 = 00 : Command/ID register. Bits 4-7 (only) used on write, to
select interrupt line, force and enable interrupts. On read, bits 4-7 are
much the same, bits 0-3 are a fixed ID value that identifies this as a
modem.
A6, A5 = 01 : Select 8250 serial chip. Address lines A1-A3 select the 8
registers in this chip in the usual way
A6, A5 = 10 or 11. One selects the modem Tx chip (16 internal registers
selected by A1-A4), the other selects the modem Rx chip (also 16
registers, selected by A1-A4).
Anyway, after probing pins on the address decoder circuit and repeateded
powering down/up the machine and running load_modem, I discovered that
the only 'register' that this command accesses is to read the ID
register, presumably to find a modem board. It does not attempt to
initialise the serial chip or the modem ICs.
I have the customer diagnostic disk. This also finds a modem, and I can
run the diagnostics on it. It pases. It also seems to write things to
various registers on the modem board (in particular, at the end of the
test, the 8250 is left set to 1200 baud, the baud_out pin (wired to the
Rclk input as usual) is running at 19200Hx). And it energises the line
relay a couple of times.
Any thoughts? Do I have an obscure hardware problem or just not the right
software?
-tony
Very odd listing.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5243310357
Someone with no feedback in Belgium claiming to be selling the Freeman
collection
for $1000
"It is with great regret that we place our PC Museum up for purchase. "
"The Freeman PC Museum is offered for sale."
"YOU CAN BUY THESE PRODUCTS FOR $ 1000 RIGHT NOW"
???
... to http://www.computermuseum.org.uk/
(for those of you not familiar with him, he's one of the few private UK
collectors of big iron - he's got some fantastic machines)
cheers
Jules
