test-drb October 2007

test-drb@ccmp.vtda.org

228 participants
467 discussions

by rcini＠optonline.net

All: I want to use a sheet of Plexiglas to make a case for my KIM-1. Fabrication isn?t a problem, but I wanted to open it up for discussion about any static electricity issues. Should I be concerned about using Plexi for this project or what recommendations do y?all have for mitigating the possibility of damage. Thanks. Rich -- Rich Cini Collector of Classic Computers Build Master and lead engineer, Altair32 Emulator http://www.altair32.com http://highgate.comm.sfu.ca/~rcini/classiccmp

18 years, 1 month

Emulex SMD controller subsystem with drives on Ebay

by tshoppa＠wmata.com

Jim s wrote: > On the east coast, or I'd buy it. > 220158695883 He also has a small pile of VT100's. I remember back in the 1990's I stacked an 8x8 (64) array of VT100's on the back wall of my garage, and that was just the working ones! If you alternate forward/backwards it takes some skill to get as high as 8 tall :-). I guess I found a home for them, 'cause I didn't drag them all along in the next move! Tim.

18 years, 1 month

Extracting CDOS files

by dave06a＠dunfield.com

Hi Guys, I've been approached by an artist who has many 5.25" Cromemco CDOS disks containing artwork from early in her career the she would like to recover. She has already made arrangements with the supplier of the original software to convert the files to something she can use on a modern PC, however she needs the files extracted from the CDOS disks. As there are several hundred disks, I would really like to find a PC based solution which I can automate. So far I can have tried the shareware version of 22disk, which can list the directory, however it reports multiple linked sectors in two of the three sample disks I am looking at, and also gets unrecoverable errors on sector 1 of every track (sector 1 on Cromemco disk is problematic with a PC - I've already got the drive slowed slightly, which allows ImageDisk to read and recreate the entire disk. So I have access to all of the sector data, but no way to feed it to 22disk. I've also tried Uniform, however it gets an unrecoverable error on any attempt to access the disk - in fact the error comes at the moment the drive selects, so I don't believe it's even trying, possibly because the P200 PC in my imaging station is "Way too fast" for software timing loops etc. So I am left with the option to extract the files from the ImageDisk images - what I need are technical details on the CDOS file system. CDOS is "CP/M compatible", does anyone know if the file system is identical - if not, can anyone point me at technical details. If yes, can anyone point me at a good description of the CP/M file system (It's been years since I needed to dig deeply into it). Anyone got source code ('C' preferred) for extracting files from CP/M? I have found sector->cluster mapping tables in the back of the CDOS manual, which hopefully will help sort out the XLT issues etc. Any other assistance/suggestions/pointers etc. would be most welcome. Regards, Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html

18 years, 1 month

Emulex SMD controller subsystem with drives on Ebay

by jwstephens＠msm.umr.edu

On the east coast, or I'd buy it. Jim 220158695883

18 years, 1 month

Unused Collections (was: Re: SGI Onyx - Three Phase to Two Phaseconversion)

by ajp166＠bellatlantic.net

> >Subject: Unused Collections (was: Re: SGI Onyx - Three Phase to Two Phaseconversion) > From: "Ensor" <classiccmp at memory-alpha.org.uk> > Date: Thu, 11 Oct 2007 02:44:12 +0100 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >Hi, > > > You are getting dangerously close to one of the great > >revelations of collecting life: > > > > Most collectors do not do anything with their > > collections. > > > > Nearly all of us are on this constant drive to get new items, > >chase them down, acquire them - then put them in the pile. 5 > >percent of the pile gets used and played with 95 percent of the > >time.... > >Never a truer word said.... Generally I have to agree. That said I'm the throwback here I guess. Of the 45 or so machines I have they are grouped by how I use them. Some like the 6800D1 and SC/MP very rarely see power. Others like my IMP48 and COSMACELF are small and don't need a terminal so its out and played with. the PDP-8, PDP11s and microVAX are all out and accessable. Same for the DECmateIII and several of the CP/M machines. Now there are machines I don't use but are occasionally brought out to insure run. I also have a small group maybe 5 systems that haven't run in 5 years as their status is "second copy" which is a working system but not intended for regular use. If there is one constant it is there are systems in that group that see power often and are part of my prefered tools to do various things. The fact that those tools are a bit retro is less important than they work and any bugs are well known. Allison

18 years, 1 month

MFM or ESDI QBUS controller for one PDP-11/23 PLUS

by ajp166＠bellatlantic.net

> >Subject: MFM or ESDI QBUS controller for one PDP-11/23 PLUS > From: "Sergio Pedraja" <spedraja at gmail.com> > Date: Mon, 08 Oct 2007 18:56:57 +0200 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >Hello. > >As the subject say, I'm searching for one working MFM (not RQDx, better >something like the Andromeda UDC) or ESDI QBUS controller plus cables to use >with one PDP-11/23 PLUS. The ESDI would be a better choice because I have >one 300 Mb HD and one 700 Mb HD, both of full-height (in the terms used with >old PeeCee's). I'm perplexed. The RQDXn controllers are MFM and Floppy. Best shot is late firmware RQDX3 as it does RX33 and most all MFM drives. Its also easier to find. Allison > >I have too a couple of RX33 floppies but no controller for them. I would >appreciate to obtain one. > >Finally, I am thinking in use one old PC enclosure for disks and floppies. >Someone has did it ? Results ? > >Can contact privately with offers. > >Thanks and Greetings >Sergio

18 years, 1 month

DEC RSX-11

by ajp166＠bellatlantic.net

> >Subject: Re: DEC RSX-11 > From: Holger Veit <holger.veit at iais.fraunhofer.de> > Date: Thu, 11 Oct 2007 09:48:20 +0200 > To: General Discussion: On-Topic Posts Only <cctech at classiccmp.org> > >Allison schrieb: >- some of the resident libraries are missing/not INStalled (because on > that turn-key application there were not required) Exactly the case. >Was [7,*] also privileged? I am not sure anymore after several years. >The point may be though that >the password file is actually owned by [1,2] - in this case you might >not be able modify it from [7,21]. It was sufficient to perform ACNTRES actions. >>> http://www.computer.museum.uq.edu.au/RSX-11M%20Version%204.2%20Manual%20Set… >>> for one set. >>> >> >> Very helpful, save for Acrobat say the files are corrupt for any of the more >> useful ones and crashes for manuals over 25MB. >> >> >I had downloaded them, as well as the ones at John Dundas's site, and >did not find corruptions. The files >at the Australian computer museum are large, though; the first thing I >did was to compress them with an >Adobe Acrobat. There it should have been detected if they were corrupt. Firefox was used to do the download. My Adobe says files are corrupt and when it attempts to repair the system bluescreens (NT4/sp6 NO MS web apps). The smaller files, those around or under 10mb seem fine. >So I guess its you having some transfer problem. May be the case but ??>? Or Acrobat reader V5.05 is broken. >> I'm not sure anything useful other than a "Pregen"ned system is on >> the disk as I havent found any languages. >> >> >Hmmm, to sysgen a new system, the installation set is required. One >indicator you might have sysgen stuff >on the system is the presence of some [200,200]SYSGEN*.CMD scripts, and >the current configuration >should be in [200,200]SYSSAVED.CMD;* Not there. [200,200] is mostly empty and the supporting directories are as well. There are less than 12000 blocks used on a RD52(~64000 blocks). Allison

18 years, 1 month

DEC RSX-11

by ajp166＠bellatlantic.net

> >Subject: Re: DEC RSX-11 > From: "e.stiebler" <emu at e-bbes.com> > Date: Thu, 11 Oct 2007 07:16:42 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Allison wrote: >> HALP! >> The RD52 has RXS11 and boots. > >Hello Allison, >PLEASE tell us to which version it boots ;-) RSX-11M PLUS V2.1 BL15 256KW system: "PREGEN" However the system is minimal and best described as built to run a specific application. All of the required files to build a more complete system are not there. I does boot and and shutdown without complaining. There are no languages and the only editor is a bare bones line oriented EDI. Looked exciting for a while. I'll likely remove the disk and install another to preserve what I have and run RT-11 on the new media. Allison

18 years, 1 month

Indigo 2 - no video.

by trasz＠FreeBSD.org

I just got a "teal" SGI Indigo 2. Problem is, I get no graphics output. When I turn it on, the LEDs on keyboard flash once, the LED on the I2 turns on, after two seconds turns off, then turns on again and stays turned on. I hear the boot tune. Monitor is SGI 20E21, connected via 13W3 cable, but it gets no signal (or at least no sync) from the machine. Manual says something about "dissonant piano chord" - how is it supposed to sound like? One thing I've verified that without graphics card the chord sounds the same. NumLock LED on the keyboard does not light when i press that key. Is there some way to reset the NVRAM or something like this? Note that there are no SCSI disks installed - the bays are empty. -- If you cut off my head, what would I say? Me and my head, or me and my body?

18 years, 1 month

cctalk Digest, Vol 50, Issue 35

by feldman.r＠comcast.net

> Message: 8 > Date: Thu, 11 Oct 2007 11:06:49 -0400 > From: "Richard A. Cini" > Subject: The use of Plexiglas for mounting PCBs > > All: > > I want to use a sheet of Plexiglas to make a case for my KIM-1. > Fabrication isn't a problem, but I wanted to open it up for discussion about > any static electricity issues. Should I be concerned about using Plexi for > this project or what recommendations do y'all have for mitigating the > possibility of damage. > > Thanks. > > Rich You might have trouble with electrical interference from the computer getting out and affecting other devices. I had that problem with a PC clone I put in a plywood case. It interfered with an open-frame monitor I had on top of the case until I put metal screening under the case lid. Bob

18 years, 1 month

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test-drb October 2007