test-drb April 2008

test-drb@ccmp.vtda.org

196 participants
307 discussions

by dgriffi＠cs.csubak.edu

I'm trying to find a Micron Xceed Color30 card and Greyscale30 card for a Mac SE/30. What I'm trying to do is enable 8-bit greyscale on the internal monitor. I've seen brief references to a clone of this sort of thing, but nothing more. -- David Griffith dgriffi at cs.csubak.edu

17 years

Safety precautions. Was: Help with ICL power supply faul

by roger.holmes＠microspot.co.uk

On 11 Apr, 2008, at 18:00, cctalk-request at classiccmp.org wrote: > > Message: 12 > Date: Fri, 11 Apr 2008 09:31:49 -0700 > From: "Chuck Guzis" <cclist at sydex.com> > > Those with big iron with high-current line-side requirements are > advised to use the "one hand in a rear pocket" technique when poking > around in a PSU. Good idea, thanks for that. Last time I poked around in one of my 1301's PSUs it was seven feet up in the air and I jiggled the stabiliser rack and the -22.6v, quarter inch bus bar touched the frame, showering me with sparks and burning a notch into the angle iron frame :-) Its not just AC that's dangerous on big iron. Over the years I've been bitten many times by 240v and no ill effects but I get very careful when near the three phase 440v supply, or near car H.T. leads or any thermionic valves, especially CRTs. Roger Holmes.

17 years

IS32 Optic RAM Datasheet and Steve Ciarcia's Micro D-CAM Artical

by rdawson16＠hotmail.com

Thanks Dave! What a trip down memory lane (pun intended) I worked for Micron in the Imaging Group until July, when the whole camera / cell phone market had a meltdown. The imaging group was spun off as a separate company, and we were to move from Boise Idaho to San Jose. Needles to say, most of us in my group that built new silicon test probe and DUT cards left. Like sure, are you going to double our salary to afford to live in San Jose? And leave beautiful Idaho? Micron Imaging is now Aptina: http://www.aptina.com/ You might get to see our last project filming the athletes at the Beijing Olympics. We built a ultra high resolution imager as a technology demo, Ultra HD resolution, 16x HD, 4k x 4k resolution. Its also very high framerate, 1K frames per second. I did the data pipes to stream the video off of the part, 16 750MHz LVDS differential pairs.... Randy > From: dave06a at dunfield.com > To: cctalk at classiccmp.org > Date: Fri, 11 Apr 2008 07:47:00 -0500 > CC: jwallis at fbiacademy.edu > Subject: Re: IS32 Optic RAM Datasheet and Steve Ciarcia's Micro D-CAM Artical > > > Mr. Dunfield, > > > > In a 2004 posting you indicated that you had a copy of the Micron Technology IS32 OpticRAM data > > sheet. Have you ever scanned the document? Would it be possible to obtain a copy? > > > > Your assistance would be appreciated. > > Jane Wallis > > I have placed the IS32 and Micro D-CAM articals at: > > http://www.dunfield.com/pub/index.htm > > I will leave them there for a few days - please download asap. > > -- > 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 _________________________________________________________________ Get in touch in an instant. Get Windows Live Messenger now. http://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_Refres…

17 years

Help with ICL power supply fault (Farnell SMPS)

by cclist＠sydex.com

On 11 Apr 2008 at 2:53, Tony wrote > The right way to do it, of course, is to use an isolating transformer, but > not everybody has one of those in the workshop. This is something that anyone who owns a screwdriver and a soldering iron should have if one intends to go poking around in the "guts" of powered equipment. Fortunately, it's easy for us in the US and Canada (and Japan) where mains power is 120v. Just about anything with a transformer in the PSU (still pretty common in audiophile gear, as are large electrolytics) has been constructed with a "universal" 100/120/220/240 transformer, meaning that there's usually a split primary, so one primary winding can be used as input and other, as output. (the other windings can be left NC). Those in 220/240 volt-land can use two transformers of the same secondary voltage connected back-to-back as an isolation method. Another option is to scavenge a transformer from a UPS--it's very common that the same transformer is used to charge the batteries and as an inverter output, meaning that there are often two sets of line- voltage windings present. I have a box with a large scavenged UPS transformer and a Variac for my workbench--and its own 5 amp fuse. Not only do I get isolation, but I can adjust the output voltage--and I don't have to rely on tripping the 20A distribution panel breaker when something goes wrong. This is particularly important with some of the old hobbyist gear-- IIRC, the MITS Altair ran a couple of bare PCB traces at line voltage to the front-panel power switch. Those with big iron with high-current line-side requirements are advised to use the "one hand in a rear pocket" technique when poking around in a PSU. Cheers, Chuck

17 years

Fwd: [roys-tech-chat] Building replacement for TTL counter DM8552 (National Semiconductor)

by rtellason＠verizon.net

Have any of you guys ever heard of this chip? It's new to me... ---------- Forwarded Message ---------- Subject: [roys-tech-chat] Building replacement for TTL counter DM8552 (National Semiconductor) Date: Thursday 10 April 2008 08:58 From: "Michel" <itloiiw at yahoo.com> To: roys-tech-chat at yahoogroups.com Hello all, I am trying to repair a Systron Donner Frequency Counter model 6254 that does not count well. This counter is build with "simple" TTL chips only. (I have no manual nor schematic). The culprit (found by swapping chips) is a TTL chip from NS : DM8552 It is a decade counter with latches and tri-state outputs. Since I did not find any source for replacement chip, I have thought to build some equivalent circuit with maybe 74LS160 and 74LS393. My problem is that I have no datasheet except pinout for DM8552 (found there http://www.datasheetarchive.com/pdf/1215336.pdf ). Does anybody have more information about it ? Many thanks in advance, Michel Grenoble - France. ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/roys-tech-chat/ ------------------------------------------------------- -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

17 years

eric's read9144 program

by aek＠bitsavers.org

here http://svn.brouhaha.com/viewvc/read9144/ There is a known problem with it dealing with HP backup tapes that have end of file set on the first block, but it knows how to talk CS80 through the linux library.

17 years

PC <-> HPIB <-> CS80 stuff ; was HP-IB drive simulator

by aek＠bitsavers.org

> I also took another look at the Linux-HPIB project and > see that it has been rekindled. Unfortunately, I was not able to get a good > build on my system. It's probably an incompatability in the kernel... I would suggest looking at this more seriously. Eric Smith wrote a program using this to do block level reads of 914x tapes a few years ago.

17 years

HP-IB drive simulator

by dbetz＠xlisper.com

Has anyone invented a way to use a PC (or Linux or a Mac) to emulate an HP-IB drive for the purposes of providing mass storage to an HP85 or HP87 computer? I know such a thing exists for emulating Atari drives on a PC. Has anyone done anything similar for HP-IB?

17 years

Bringing up an older Mac

by dgriffi＠cs.csubak.edu

I've just brought up a Mac SE/30 with fresh disks and noticed that the monitor occasionally gets wavy or shudders. How should I proceed in fixing this? For those interested: Apple has all sorts of old stuff at http://www.info.apple.com/support/oldersoftwarelist.html You'll need the Linux version of Stuffit from ftp://ftp.allume.com/pub/archive/linux/StuffIt/stuffit520.611linux-i386.tgz. Unstuff the file you get from Apple, the Unstuff the .data file. Then make the disk like this: dd if=System\ Startup of=/dev/fd0 bs=84 skip=1 -- 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?

17 years

Hitachi HN27C1024HG-85

by adamgolas＠earthlink.net

You've written me that you have HN27c1025HG-85 but I am looking for HN27c1024HG-85. If you have what I am looking for please let me know the price. Thank you, Adam Golas

17 years

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test-drb April 2008