Hello All,
I have available one PDP 11/35 in BA-23 box configuration.
Processor comes with base CPU, MMU & stacklimit register.
No EIS, FIS or RTC is included.
This machine is the last spare we had for a customer.
2 others have already found a good home and are well cared for.
Contact me off list for more details if needed.
Pictures to be seen at www.groenenberg.net/download/junk
--
Certified : VCP 3.x, SCSI 3.x SCSA S10, SCNA S10
Hi! As a compliment to the N8VEM S-100 backplane project, I am designing an
S-100 card edge connector in KiCAD. As a demonstration I am including it in
an S-100 prototyping board.
Please take a look and thorough review. Any comments, suggestions, and/or
questions are welcome. If there is sufficient interest I may do a small PCB
manufacturing run. I estimate each PCB would be in the $25 range depending
on quantity. The initial run would be primarily for testing purposes so
would be rather small.
I still have 4 of the 8 initial N8VEM S-100 backplane PCBs so if anyone
would like to get involved that would be great. The PCBs are $32 each plus
$2 shipping in the US. The good news is that by waiting you now know the
parts all fit, that it seems to work, the active terminator circuit appears
to be working correctly; the S-100 connectors are installed and seem to have
all the proper voltages. In other words, your risk of a total dud project
has been dramatically reduced.
There are two new files in the N8VEM S-100 wiki; one is the "blank" board
with outline of an S-100 board and the edge connector as a template for
KiCAD and the other is an S-100 prototyping board which uses the template.
I have compared the template against IEEE-696 and also several S-100 boards
in my collection. I have to admit I am a bit disturbed by how much
variation there is in S-100 mechanical tolerances. They all seem to fit but
the variations are quite large between manufacturers, the standard, versions
of PCBs, etc.
http://n8vem-sbc.pbworks.com/browse/#view=ViewFolder¶m=S100
Thanks and have a nice day!
Andrew Lynch
> I am sure somebody would have coded Lotus to some other
> desktop x86 type PC and it would have taken off.
123 was modified to run on a number of pseudo-compatibles. None of them took off. Were taken off the desktop oftentimes, and replaced w/an IBM or close-clone.
The Apple
> II took off just because of visivcalc. I view the apps as
> being more important then the hardware.
Apps can't run w/o h/w. H/w can't run w/o apps. You can have a really nice app, but no good h/w to run it on (ironically Jobs wrote the BASIC interpreter for the Apple 1 before the h/w was designed). And you can have really nifty h/w wit no apps. It's a matter of what platform the apps are going to be written for.The market to a large degree decides this, but the hardwarez got something to do w/i too.
The IBM PC became a
> huge hit because it was an open architecture and it had IBM
> backing, the clones just made it more universal with
> companies having the expensive IBM and Compaq machines and
> home users had the lesser clones. I don't think the PC
> explosion would have come about without the clones.
Explosion are inevitable. Hopefully your particular piece of hardware didn't explode (too often). Mine did from time to time. The microcomputer explosion was inevitable. But what the market needed was a fine StrongMan to take control and guide is into brainless compatibility. And what a fine time to have such a brilliant teleprompt reciter in the White House to guide us into becoming mindless liberal drones.
In the beginning, there were several early PC Clones and work-alikes.
A friend of mine had the Columbia MPC. By the time we were done with it, it had a Vide0-7 VGA card (that had a Micro-channel interface if you flipped the board the other way.), a Lightning 286 upgrade card, a Trackstar 128 Apple II on a board. I was really sorry when he trashed it. That was a nice, reliable machine.
Zebra Systems had several like the Eagle PC seen over Stewart's shoulder in the Wall Street Journal video, which was a turbo XT clone. We also had a Televideo box which was an MS-DOS Compatible box that used an intelligent terminal rather than a keyboard and MGA/CGA display.
I ran Wordstar, dBase II, and Fancy Font on that machine to do our ads. It replaced our IMSAI 8080 (with a Z-80 card) as our main system for order processing (using dBase II).
I worked for a time for a company that sold American XT clones from a guys house. They were exact clones of the 5150 and 5160 in that you could burn a set of IBM Bios ROMs and the machine would be 100% compatible with a PC/XT and have BASIC in ROM if you put those chips in too.
My first PC was an XT clone with Phoenix BIOS that had turbo mode and a V-20 chip which made it much faster than a stock PC. It had two 13mb Seagate drives and I ran my BBS off it until I sold it in favor of a 286 clone I built from parts. It had a neat flip-top case (like a car hood). I still have the keyboard from it, because it was a great keyboard and I continued to use it on the 286.
I had a rear panel reset and turbo switch in a bracket as the case didn't have up-front lights or buttons.
I miss those days.
Al
Phila, PA
(Formerly of Brooklyn, NY)
I'm still looking for one of the above. This was a daughterboard designed
to sandwich between a Z80 and its socket. It carried the Corvus
proprietary chipset and permitted any CP/M machine to become a client on
their Omninet network.
If anyone even knows who has one, I'd appreciate a lead. In a pinch,
given good photos I can likely reverse engineer the PCB and build my own
(have a slew of Apple 2 transporters to harvest the chips from).
The device is mentioned in one of the Appendices to DRI's CP/NET technical
docs, FWIW.
Steve
--
FYI, if you were on the P112 mailing list previously (like back in
2006-2007), you'll need to resub again.
--
David Griffith
dgriffi at cs.csubak.edu
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
Or at least items found near a mainframe. $10+shipping gets you:
3420 Field Tester - appears to be a tape drive exerciser.
4248 Login Probe - in box with manual
IBM P/N 6428316 Kit, ESD Handling - official IBM ESD safety mat.
It's Springtime, and that means it's time to pare down the collection.
Next up is this lovely DEC portable printing terminal, the LA12-A.
This model has the DB25 port, the acoustic coupler and the 300/1200bps
internal modem. It's yellowed and a bit dusty, but appears to be
working. It responds to keypresses in local mode, at least, and it
will print out its config page. I can't get it to talk to my PC via
the serial port, but I may not be configuring it correctly. No time
for that now, must clean the garage!
Asking $25+shipping from 60074. A must for any DEC or terminal (or
old yellowed plastic) collector!
--
jht
>
>Subject: Re: non-DEC-compat HW to read RX02's?
> From: "Nico de Jong" <nico at farumdata.dk>
> Date: Sat, 09 May 2009 19:47:11 +0200
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>>> What non-DEC-compatible stuff out there can read RX02's?
>>>
>>> Obviously the original RX02 drive can read RX02's... as can all the
>>> DSD, Sigma, etc. Q-bus, Unibus, Omnibus compatible controllers.
>>>
>>> But what can read RX02's using a generic SA801-type drive and a
>>> PC-clone?
>>
>> I'm pretty sure that you're supposed to be able to do this with a
>> Catweasel and the utils that make a DMK out of them (Tim Mann's name
>> comes to mind).
>>
>
>I checked my Octopus system, and it says it supports the following DEC
>formats:
>
>RSX 5.25" 400k
>
>VMS 3.5" 1.4M
>VMS 5,25" 400K
>VMS 8" 251K
>
>VT180 5.25" 180K
>
>RT11 5.25" 400K
>RT11 3.5" 720K
>RT11 5.25" 1.2M
>
>Is RX02 identical to one of the formats mentioned above ?
>
>You can also take a look at InterMedias site at
>http://www.intermedia.uk.com/disklist.htm#D
>
>Nico
No VMS 8" 251K is RX01.
All of the others are fairly generic floppy controllers in the host system
as DEC generally used the 1793 or SMC chips that did formats reasonable and
common.
RX02 is very unique.
Allison
