test-drb September 2001

test-drb@ccmp.vtda.org

256 participants
661 discussions

microcoding a PC into a PDP-11 (was: RE: Classic Computers vs. Classic Computing)

by pete＠dunnington.u-net.com

On Sep 17, 9:42, Jonathan Engdahl wrote: > Have you ever soldered down a flash ROM? Not fun. I used 36 gauge self-strip > magnet wire and tweezers under a 40X stereoscope. I'd rather buy one > prebuilt if available. If you build you own, it might be hard getting the > interfacing and timing compatible with DRAMs. The ones I've seen have been regular SMD (0.5" pitch) devices which are not too hard to do with hot air, or are ordinary DIL (0.1" pitch). The last one I soldered was a DIL chip. Timing might be a problem; I have almost no idea what access time DIMMs are supposed to be but I expect it's faster than SIMMs. SIMMs are usually in the 60ns-120ns range, and it's not too hard to get FLASH or EPROM in that range too. You'd just need to demultiplex the addresses (latch the addresses presented on the first part of the memory cycle). Of course, modern motherboards use DIMMs. > Of course it would be feasible to implement a PDP-11 emulator in the BIOS > ROM, it just would not be as fast as the one I'm thinking of. Back in the > days of QEMM/386, I remember allocating 64K for the BIOS ROM. I haven't > really looked that closely at a BIOS ROM since then. I was wondering if > modern mainboards had larger ROMs, or if they still are stuck with 64K. I don't know for sure, but I seem to recall seeing at least 128KB. Not megabytes, though! -- Pete Peter Turnbull Network Manager University of York

23 years, 11 months

Classic Computers vs. Classic Computingt

by dittman＠dittman.net

> >> >The PIII will emulate the keyboard layout of a VT220 if you use an LK461 > >> >keyboard. > >> > >> What makes the LK461 special? > > > >The LK461 (and related keyboards, like the LK46W) have the same layout as the > >LK401, including all the keys. I use a couple on my Alphas and VT525. > > What about electrical or connector differences? > > I'm curious as a bunch came into a surplus place, and one of the other > junkies grabbed them all, but had no interest in the LK401. The LK461 has a PS/2 connector. The LK401 has a phone-jack connector. The LK401 can only be used with a VT2x0/VT3x0/VT4x0 terminal. -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

23 years, 11 months

CIQBA

by dittman＠dittman.net

Does anyone have a spare CIQBA for sale? -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

23 years, 11 months

Embedded PDP-11 Processors

by dittman＠dittman.net

> My last DEC Field Service experience was with HSC-50's. > They had their own bus (no name known by field service). > I thought they went from F11 CPUs to J11 CPUs in the later ones (HSC70). > > I wondered if they ever used 78032 (uVaxII chips) in some of them. We have HSC95 controllers. I haven't looked inside as they are 24x7, but in the next month I'll be taking two of them out of service (and leaving two just to serve some 3480 and 9-track tape drives). Is the OS RT-11? -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

23 years, 11 months

Embedded PDP-11 Processors

by IVIE＠cc.usu.edu

> Where else did the PDP-11 get embedded? There's a T-11 on the RQDX disk controllers. I've also been involved in a couple of projects which embedded complete MicroPDP-11s, but you're not likely to have heard of any of them. Roger Ivie ivie(a)cc.usu.edu

23 years, 11 months

Worm/Virus alert

by Marion.Bates＠dartmouth.edu

Hey all, Sorry bout the spam (and sorry if you already know about this) but I figured you folks might want to know to watch out for a new Code Red-esque worm that's running rampant...below is from SlashDot. http://slashdot.org/articles/01/09/18/151203.shtml -- MB ************** New (More) Annoying Microsoft Worm Hits Net Posted by CmdrTaco on Tuesday September 18, @10:10AM >from the what-a-pain-in-the-arse dept. A new worm seems to be running rampant Unlike Code Red, it attempts to hit boxes with many different exploits (including what looks like an attempt to exploit boxes still rooted by Code Red). It looks like each IP tries 16 attempts on its neighbors. There is also a new mail worm mailing WAV files or something with bits of what appears to be the registry... it may or may not be related. Got any words on this? Shut down those windows boxes and stop opening attachments. And make that 21. Got another one while writing this story. All my hits are coming from 208.n.n.n (where I am) I'm sure it'll keep moving to nearby boxes. Here are examples of the requests it's sending: GET /scripts/..%%35%63../winnt/system32/cmd.exe?/c+dir GET /msadc/..%255c../..%255c../..%255c/..%c1%1c../..%c1%1c../ ..%c1%1c../winnt/system32/cmd.exe?/c+dir GET /_vti_bin/..%255c../..%255c../..%255c../winnt/system32/cmd.exe?/c+dir While writing this story I was hit a total of 4 times, 16 GET attempts per attack. In only 4 minutes. Also of interest, My desktop has now been hit about 500 times today, all from 208.x.x.x IPs. This might be really bad. I still haven't read anything about this anywhere else, so you heard it here first ;) Update: Web servers compromised by this worm apparently attach a "readme.eml" to all web pages served... and due to a bug in IE5, it will automatically execute the file! Yay Internet Explorer!

23 years, 11 months

So I finally had time to pick up my MMJ crimper....

by fernande＠internet1.net

It came in last week, I ordered it from Kendall electric. It's an Ideal Industries Crimpmaster. I was a little disappointed to find that it was made in Taiwan. Oh well, at least they are allies. I bought the connectors to go along with it too. I got home, promptly cut off the filed down standard RJ11 connector off of one end of my cable. THEN, I tried putting a new connector into the crimper.... I couldn't figure out how the dumb thing was supposed to work! I was thinking GREAT, I just dumped 70 bucks into a specialized tool I can't seem to use. I checked part numbers several times. Turns out the MMJ die set was in wrong.... they misassembled it at the factory. It worked fine once I straightened it out :-) Now I have a proper cable :-) Maybe sometime soon I can start messing around with the Vax again.... still need to break into VMS. Chad Fernandez Michigan, USA

23 years, 11 months

Embedded PDP-11 Processors

by dittman＠dittman.net

DEC used embedded PDP-11 processors in many different places. There's the console for some of the VAX systems, and I've read some of the DECsystem-10 or DECSYSTEM-20 systems used a PDP-11 as a console system. Other uses of the PDP-11 that I know of are the HSCxx controllers and some of the printers. Where else did the PDP-11 get embedded? I know the HSZxx/HSDxx/HSJxx controllers used an Intel i960 processor, so there's no PDP-11 there. And speaking of the HSCxx controllers, are the PDP-11 controllers customized or is there a standard QBUS or UNIBUS system in there? -- Eric Dittman dittman(a)dittman.net Check out the DEC Ethusiasts Club at http://www.dittman.net/

23 years, 11 months

Worm/Virus alert

by dhquebbeman＠theestopinalgroup.com

> OK, I know this is not exactly on-topic, but I thought it was > ridiculous enough to share. > > Here's what I get from the logs on my IRIX web server running apache: > > > egrep "scripts/\.\..*" access_log | grep "18/Sep/2001" | wc -l > 7273 > > > egrep "msadc/\.\..*" access_log | grep "18/Sep/2001" | wc -l > 809 > > > egrep "_vti.*/\.\..*" access_log | grep "18/Sep/2001" | wc -l > 811 > > so, that's 8,893 bogus MS exploit requests. note too, that those numbers grew > by about 5% in about 5 minutes. Damn, I'm glad I don't run a windows machine > :) We do, and it isn't causing us any more trouble than *nix servers. 'Coz we patch. Surely the *nix sysadmins spend as much time writing Perl scripts as we do patching MS bugs... ;-) -dq

23 years, 11 months

Social Studies, mature student.

by d.quigley＠ntlworld.com

Can anyone give me any information on the definition of the word ' family '.

23 years, 11 months

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test-drb September 2001