test-drb November 2012

test-drb@ccmp.vtda.org

173 participants
212 discussions

by LYNCHAJ＠YAHOO.COM

Major progress to report on the SCSI to IDE/SD bridge project. Now the IDE subsystem and the core CPU/RAM/UART are confirmed working with the debug monitor. The SCSI subsystem is responsive and development continues on the firmware. This will be real work since the Z53C80 will be operating in target mode versus host mode but I think it is doable. It will probably will never be a speed demon but should work fine for older slower SCSI-1 devices which is the intended audience. The project is not architecture specific. At least in theory this board could be useful for a wide variety of computers such as Atari, Amiga, Mac, DEC, etc as well as less intuitive SCSI-1 using machines such as sewing machines, synthesizers, lab equipment, etc. Please contact me if you are interested in joining the development team. Thanks and have a happy holidays! Andrew Lynch From: Andrew Lynch [mailto:LYNCHAJ at YAHOO.COM] Sent: Saturday, November 24, 2012 11:22 AM To: 'n8vem at googlegroups.com' Subject: RE: [N8VEM: 15014] SCSI2IDE Progress Thanks Wayne! That's fantastic news! Woo Hoo! Thank you very much! It sounds like we may need a change to the Flash ROM write logic. I will take a look to see if I can figure out what is causing the glitch. Thanks and have a nice day! Andrew Lynch From: n8vem at googlegroups.com [mailto:n8vem at googlegroups.com] On Behalf Of Wayne Warthen Sent: Saturday, November 24, 2012 12:07 AM To: n8vem at googlegroups.com Subject: [N8VEM: 15014] SCSI2IDE Progress I'm happy to report a little progress on the SCSI2IDE front. Today, I was able to prove out the basic board with Zapple Monitor. I was also able to drop in the existing PPIDE driver from RomWBW and prove out the PPIDE interface to a CF card (basic sector read/write tests worked). Finally, I was also able to read/write the mode data on the SCSI controller chip. This is all still a bit of a hack, but definitely coming together... The 32K flash chip on the board was giving me some trouble. The chip kept getting corrupted during power on/off cycles. I finally severed the /WR line and tied it high. The chip does have a software write protect mechanism, but I was afraid to use it because I wasn't sure if my programmer would know how to unprotect it. I intend to clean up my work and post a work-in-progress build on the Wiki in a few days. -Wayne -- You received this message because you are subscribed to the Google Groups "N8VEM" group. To view this discussion on the web visit https://groups.google.com/d/msg/n8vem/-/hLjTpXsUw_cJ. To post to this group, send email to n8vem at googlegroups.com. To unsubscribe from this group, send email to n8vem+unsubscribe at googlegroups.com. For more options, visit this group at http://groups.google.com/group/n8vem?hl=en.

11 years, 5 months

BGA resoldering - flux?

by cisin＠xenosoft.com

On Thu, 22 Nov 2012, Scott Quinn wrote: > My plan was to ramp it up to 400F in an oven, soak for 5 mins, then cool > down to minimize thermal issues. Does this sound good? Is 400 degrees anywhere close to hot enough?

11 years, 5 months

Windows memory requirements [was RE: Google v AltaVista - Re: Big Alphas (was Re: FS: HP AlphaServer DS15)]

by RichA＠vulcan.com

From: Liam Proven Sent: Thursday, November 22, 2012 6:57 AM > Ah, apparently *all* the Win9x codebase struggles with approaching a > gig. > For some of them, you can't /install/ with more than a certain amount, > but once it's running you can put the extra RAM back in. Not just the 9x systems. Back when I was doing systems administration at XKL, I brought in a new Dell server (dual Pentium 3 Xeons, 4GB RAM in 1 card, you know, little box for 1997 :-) running NT 4.0 Terminal Server. As I was adding engineering applications to the base install, a DLL got overwritten, the box crashed, and I had to re-install from the ground up--beginning about 19:00 on a Friday night. Long story short, I was on the phone to Round Rock from about 21:00 till 06:00 the next morning, struggling with the install, which would die at the point where the system re-boots to run from the disk instead of the CD. Turned out that the install version could not run in more than 1GB. After the shift change at Dell, the new guy on the phone said he thought there was a BIOS setting which would handle the issue, rather than my having to have a 1GB card FedEx'd for Monday morning. Yup, the BIOS indeed had a setting which was named roughly "Pretend I have only 256MB in this box". Gack. Rich Alderson Vintage Computing Sr. Systems Engineer Vulcan, Inc. 505 5th Avenue S, Suite 900 Seattle, WA 98104 mailto:RichA at vulcan.com mailto:RichA at LivingComputerMuseum.org http://www.LivingComputerMuseum.org/

11 years, 5 months

YouTube take on my Commodore PET 2001 32-N

by terry＠webweavers.co.nz

More YouTube reveals showing computers in my collection which may be of interest to some. This time my Commodore Pet 3001 32-N (CBM 3032) http://youtu.be/H42ZPSw8EE8 Terry Stewart (Tez)

11 years, 5 months

cctalk Digest, Vol 111, Issue 49

by joerg.sigle＠jsigle.com

Hi. You might google for people fixing nvidia notebook graphic boards like in the Dell M90. They report success in temperature ranges from 120 .. 200?C in their kitchen ovens for 20 minutes, where the solder may not melt, but apparenly, the heating suffices to re-establish contact for weeks thru months. I find it especially interesting that the lower temperatures also seem to work. I've even seen a poll on who tried which temperature. Sadly, who made that poll only asked for successful attempts, not failures, so their original answer on "what is the best temperature to recommend" would never be answered... Kind regards, js On 23.11.2012 19:00, cctalk-request at classiccmp.org wrote: > Message: 18 Date: Fri, 23 Nov 2012 08:28:36 -0800 (PST) From: Fred Cisin > <cisin at xenosoft.com> To: "General Discussion: On-Topic and Off-Topic > Posts" <cctalk at classiccmp.org> Subject: Re: BGA resoldering - flux? > Message-ID: <20121123082818.P57681 at shell.lmi.net> Content-Type: > TEXT/PLAIN; charset=US-ASCII On Thu, 22 Nov 2012, Scott Quinn wrote: >> >My plan was to ramp it up to 400F in an oven, soak for 5 mins, then cool >> >down to minimize thermal issues. Does this sound good? > Is 400 degrees anywhere close to hot enough? -- ------------------------------------------------------------------- Dr. med. J?rg M. Sigle +41-76-276-8694 http://www.ql-recorder.com +41-32-51-22-944 http://www.jsigle.com Have a lovely day... +49-176-964-35413

11 years, 5 months

Hobbyist CP/M home brew computer PCBs available!

by LYNCHAJ＠YAHOO.COM

Hi If anyone is interested in building their own CP/M or other hobbyist home brew computer there are plenty of N8VEM ECB PCBs available. These can be used to build your own system from scratch or to augment an existing home brew computer. The ECB standard is essentially a Z80 bus so these PCBs are easy to interface into most any home brew system. They are also reliable and easy to assemble using only through hole components (no SMT or exotic technologies). Here is the current inventory of PCBs. As you can see there are many boards still available for the ECB systems. http://n8vem-sbc.pbworks.com/PCB-Inventory The ECB PCBs are $20 each plus $2 shipping in the US and $5 elsewhere. Most builders send a PayPal to LYNCHAJ at YAHOO.COM but other arrangements are possible. All of the design information like schematics, PCB layout, KiCAD EDA files, software, build instructions, parts lists, etc are all free and publicly posted on the N8VEM wiki. If funds and/or PayPal is an issue, we can make trades for certain computer parts, electronic components, tools, metals, coins, unused gift cards, shipping materials, scrap, etc. Please let's discuss! Thanks and have a happy holidays! Andrew Lynch

11 years, 5 months

Don Maslin collection status

by aek＠bitsavers.org

After being contacted by Don's niece, I went down on behalf of CHM in July and retrieved every box of media that was in the storage unit from his garage. I've spent several months going through everything, including the PCs that were there, and could not find what I had assumed were disk images that are described in the 'sysdisk.txt' file that Don maintained which I've attached. Does anyone have any contacts with the San Diego folks that knew Don that could help with figuring out where these images would have been? It's possible either they were on more modern PCs, or on a CP/M system. CHM is not willing to take everything that is still in the storage unit (mostly paper and the computers that were in the garage). I'm going to have to make a pretty strong case for trying to recover any of the systems that are still there.

11 years, 5 months

Gooey TU58 rollers

by ajp166＠bellatlantic.net

> >Subject: Re: Gooey TU58 rollers > From: "Ethan Dicks" <ethan.dicks at gmail.com> > Date: Tue, 28 Aug 2007 17:39:20 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 8/27/07, B M <iamvirtual at gmail.com> wrote: >> I am trying to get a Vax-11/750 machine up and running. It looks like the TU58 drive >> is suffering from the 'gooey roller syndrome'. > >Unsurprising. > >> I see that people have successfully used 1/2 inch (ID) Tygon tubing to replace the >> goo. Is there any specific type of Tygon tubing (eg. R3603, R2000, etc.) that is used? > >I don't know the particular variety I used in mine - I just went to >the Lowe's down the street and bought a foot of 1/2" ID tubing - >whatever they had on the shelf. I was unaware of a large amount of >varieties of tubing, so I just used what they had in stock, and it >worked perfectly. > >-ethan I started that many years ago like 1995ish. I spec'd Tygon (brnad name) as that was available to me. Most any generic Vinyl tubing works so long as it fits tight and has enough wall thickness. After about 10 years it tends to get hard, the fix is obvious. Allison

11 years, 5 months

BGA resoldering - flux?

by saquinn624＠aol.com

Fred noted: >On Thu, 22 Nov 2012, Scott Quinn wrote: >> My plan was to ramp it up to 400F in an oven, soak for 5 mins, then cool >> down to minimize thermal issues. Does this sound good? > >Is 400 degrees anywhere close to hot enough? I'm not entirely sure. 60/40 solder melts at around 360, so I was putting a bit of a fudge factor in for lead free. There's few standards (or too many) for lead-free solder, it seems. Would thinned rosin flux work? Alexandre - the earlier LaserJets are and were very good, up to about the 4000 series. Since then it's been much more hit and miss. Quite coincidentally they also shifted production to China, but I'm sure there's absolutely no connection.

11 years, 5 months

Free to a Good Home : uVAXes, LN03, LA210, 1" Instrumentation Recorders, etc [Dorset UK]

by mjd.bishop＠emeritus-solutions.com

The following "stuff" is free to a good home - downsizing the boneyard. Although, if any of it is genuinely rare or valuable I may change my mind. The deal is the usual one : collection from Portland, Dorset, UK; first come first served; collection prior to Xmas '12; no warranty as to specifics or condition; reasonable questions answered in a reasonable timescale. The highlights are: - some small (micro) VAXes - four 1" instrumentation recorders - an LN03 + consumables - an LA210 on a plinth in a large wooden box - geriatric test instruments of marginal serviceability - numerous old scopes requiring repair - some (partial) EPROM programmers "Collectors Items" 4 off SE7000 1" Instrumentation tape recorders + 2 sets of manuals + spare channel cards 1 off LA210 (I think) printer in a wooden box 1 off HP 1652B Logic Analyser [fails BIT] 1 off HP 1600A Logic Analyser [condition unknown] 1 off HP 3561 Spectrum Analyser (audio rather than RF) [flaky] 2 off HP 1200 ? storage CRO mainframes 1 off LN03 laser printer for VAXen + supplies 3 off MDB boxes for RD54 drives (c/w caddies - no disks) 1 off microVax 3400 2 off VAX 4000-200 "Junk" Fax machine - laser print very dirty (not used for several years) HP G55 USB inkjet (not used for several years) 9 off VGA monitors Stag Eprom Eraser - condition unknown Stag Gang Programmer - no PC interface, might be serial Telequipment D83 2 ch CRO 4 off [condition unknown] Gould "3000" 2 ch CRO 2 off [condition unknown] Gould OS250 CRO 2 off [condition unknown] Gould 3500 Cro 1 off [condition unknown] Gould 4050 Cro 1 off [condition unknown] Telequipment D75 1 off [condition unknown] Telequipment D66 1 off [condition unknown] [Telequipment may be worth a 3 out of 6 attempt; Goulds look more suited to breaking up; but you never know] Philips PM3295 1 off [voltage multiplier failed and unobtainium => scrap / parts] SCSI disk enclosures [condition unknown, PSU salvage ?] "Total" Junk - job lot of unservicable PSUs etc If you know of any 3rd parties with a serious use for this sort of kit, suggest they contact me. The last resort for disposition of much of this will be WEEE. Martin

11 years, 5 months

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test-drb November 2012