https://elecshopper.com/Sun-501-5401-256MB-PC100-232-pin-ECC-3-3V-DIMM-p1472
53154
I got a better deal on it, so the price is lower.
New ecommerce platform, very fast checkout, under 2 minutes!
I still have a VERY long way to go to get everything loaded again.
Damn hackers!
Cindy Croxton
Electronics Plus
1613 Water Street
Kerrville, TX 78028
830-370-3239 cell
sales at elecplus.com
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I have three PDP 11/34's available in the LA area for sale.? i have two
full systems, plus? a system with 2 RL02s, and a TU10 tape drive.
I'd like to sell all of them.? There is an extra RL02 as well.? All for
pickup, or freight drop.
please reply off list.?? I have $2000 in the lot.
thanks
jim
I?ve only just joined cctalk, so apologies for the delayed response to this query from May, but I thought the information might be useful to others in future.
I?m the person working on emulating MIPS workstations in MAME recently, and I?m a fair way through getting the Rx3230 model to a fully working state (Rx2030 is already working as of last month).
For the MIPS Rx3230 systems, which use an M48T02, the mac address should be in the first 6 bytes of NVRAM. You can read/write the NVRAM through the boot monitor using the ?g? (get) and ?p? (put) commands. You also need to provide the ?-b? argument to specify byte width, and the relevant address. The NVRAM is mapped at 0x1d000000-0x1d001fff in the physical address space, but must also set the high bit to access it through kseg0. Each 32-bit word in that range corresponds to a single byte in the NVRAM, so the resulting commands will be something like:
* g -b 0x9d000003 (read first byte of NVRAM)
* g -b 0x9d000007 (read second byte of NVRAM)
* ...
Or conversely:
* p -b 0x9d000003 0xff (write 0xff to first byte of NVRAM)
I haven?t tried to decode the rest of the NVRAM for the Rx3230 at this point (although most of the monitor variables seem to be at offset 0x600-0x6a7), but at least I can see those are the bytes that are read from NVRAM and then written to the mac address of the LANCE, and setting them to a valid address makes the network layer in MAME behave as expected.
--
Pat.
Hi
I'm sure some of us all remember Freeman Reports as the chronical of the
tape industry well into this century. Ray Freeman and his partner and
successor Bob Abraham published these reports from at least 1983 until 2007
but with Bob's death in 2007 the reports and backup files apparently wound
up in a dumpster. But Ray, Bob and Jim Porter did exchange copies of their
reports so thanks to Jim the Computer History Museum has almost all of the
Freeman Reports in their permanent collection.
There appear to be a few copies missing from the collection. A complete
list of what the museum has and what maybe missing is posted at
http://mrxhist.org/tom94022/FreemanRpt.pdf. In summary what may be missing
are:
Computer tape outlook - . half-inch products: 1994, 1985, 1990 & 1992
Computer tape outlook - . cassette/cartridge: 1984 & 1985
Computer tape outlook - all tape: 1997-2000 (as the market consolidated
towards LTO so did the reports J
Optical data storage outlook: 1985, 1988 & 1998
Mass storage/Library storage outlook: 1992, 1993, 1997 & 2000
So before they all get trashed please look and see if you happen to have any
of the possibly missing editions in your garage, attic or any other
repository.
Contact me off line if you can help.
Tom
Folks,
I've determined that the piece of my S/23 that's causing the power
supply to blow its 12V fuse is the machine update card. The manual says
this provides additional R/W storage for microprogram updates. That
sounds like something that wouldn't be necessary for normal operation.
Questions:
1. Can anyone confirm that I'm not losing anything by just pulling this?
2. Anyone have a cross ref for the IBM house numbers on these chips?
3. Anyone have a spare card they'd part with?
4. As long as I'm dreaming, anyone have a set of BRADS floppies or images?
Machine update card photo:
https://sysovl.info/pages/galleries/ibm/s23guts/s23guts13.jpg
Interestingly, the underlying PCB for this seems exactly the same as the
one for the word processing feature card.
Many thanks,
De
I'm working my way through a Tektronix 4006 terminal purchased of eBay right now. First stage is the low voltage power supplies, and I noticed right away that one of the multi-stage electrolytic filter caps there was running quite hot (this was with downstream electronics isolated, and a 40 ohm dummy load on the +20V supply per recommendation in the service manual.)
The cap in question is a multi-section Mallory can, 150 at 400 / 150 at 250, used to filter the +185 and +320 unregulated supplies. It is C395 A/B on the schematics, Tek part 290-0549-00, Mallory part 68D20193.
This terminal is so beautifully engineered inside that it would be a real shame to replace this with some sort of ugly bodge. Any part-sourcing gurus out there able to steer me in a good direction here? I have found the part listed in the various online NSN aerospace cross-referencing sites, but haven't bothered to ask for a quote from any -- I'm guessing cynically that "RFQ" + "Aero..." = 5 zillion dollars for one piece... :-) Has anybody here used one of these sites successfully?
cheers,
--FritzM.
The Computer Museum of America in Roswell GA (400 miles) has 2 working 029s. Don?t know the condition of the ribbons. Contact Lonnie Simms via info at computermuseumofamerica.org. Tell him his CA IBM benefactor sent you. I hope you have black cards. If not, let me know.
Otherwise you could try http://www.kloth.net/services/cardpunch.php and print the JPEG on heavy stock.
Donald
Date: Wed, 7 Aug 2019 18:10:32 -0400
From: Chip Davis <chip at aresti.com>
To: cctalk at classiccmp.org
Subject: I need a keypunch (briefly)
Message-ID: <5c1abccc-5548-057d-fa0c-0b6be9d0c2c8 at aresti.com>
Content-Type: text/plain; charset=utf-8; format=flowed
I was referred to this group by dave.g4ugm at gmail.com who thought you
might be able to help me.
I need to punch a half-dozen datacards for an award for a retired
IBMer. Anyone know where I can find a working 026/029/129 within 300
miles of Raleigh, NC?
Many thanks for any pointers.
Chip Davis
chip at aresti.com
+1.919.271.2582
Tried the ADM-3A out today on my PDP-8/A via the 20 ma current loop
interface - just unplugged the ASR-33 and plugged in the glass TTY :)
Worked great (the current loop probably had never been used, so no one had a
chance to blow it up), but I got tired of holding down the Shift key since
OS/8 doesn't understand lower case letters.
So I decided to set its switch to upper case only... terminal kept putting
out lower case.
Sure enough, that switch contact was stuck closed. It'd probably never been
moved since the terminal was new!
Now waiting on a 6-position dip switch from Mouser. And some 8-position
Mate-n-Lok connectors.
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Hi,
I?m doing some work for a friend who has one of these unicorns it?s apparently a super beefed up CIA use the laptop that wound up in Russia somehow and he got it shipped back here to the US
The motherboard was modified it looks like the hard drive was on some kind of a tray going to a connector which is IDE compatible
Someone had extremely poorly soldered on an IDE cable in place of the sled and over the years several of the pans of popped off and they?re not really making sense as to the solder points they?re supposed to go to. Complicating the matter is the paint outs are not just a direct staggered 40 Pin to Pin connection several of the through holes are not in use so just soldering on I had her and plug in the cable into it is not possible also the pens are staggered so that wouldn?t make it possible either.
So to cut to the chase does anyone have the schematics or the motherboard pinouts for this connector so that I can do a proper soldering job and put on a clean working cable so that this laptop can vote from the IDE hard drive?
