test-drb March 2010

test-drb@ccmp.vtda.org

182 participants
231 discussions

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HP 2671 Graphics ROM

by nig.bailey＠virgin.net

I don't know where you are tony, but I have the right pod on my old stag to do 80/8749s I'm in luton.

14 years, 4 months

RGB-VGA Converter -- buy or build?

by stojoskij＠ikomline.net

Hi, I need scematics of RGB to VGA converter. I want to connect Wheel Balancer machine to computer VGA monitor. Old monitor is VALVO VCC93/00 fixed frequency (15KHz) and have R, G, B and common Sync signals. I would be grateful if you can help me! Best regards, Jovica

14 years, 4 months

Disc analyser news update

by jonas＠otter.se

On Sat, 20 Mar 2010 20:38:31 +0000 (GMT), ard at p850ug1.demon.co.uk (Tony Duell) wrote: > Subject: Re: Disc analyser news update > To: cctalk at classiccmp.org > Message-ID: <m1Nt5RK-000J3oC at p850ug1> > Content-Type: text/plain > ... > > Well, OK, please name one change in the last 20 years that has made > _my_ > life better. > > -tony > I don't know what your health is like, but should you get high blood pressure, or a hernia, I can assure you that the medicine/surgery you will get will be much better than what was available 20 years ago. Or even having some procedure done by a dentist. And personally, I find that modern mobile phones and new services available on the Internet (on-line banking, for example) have made *my* life a lot easier (and better). /Jonas

14 years, 4 months

HP equivalents lists -- warning!

by ard＠p850ug1.demon.co.uk

I am sure everyone here who fixes old HP stuff knows of the equivalents lists that were published in Bench Briefs (which are now on the web). Today I was looking at aboard from an HP tape drive. I was pretty sure the 40 pin chip with a Motorola logo and an HP 1820-xxxx number was some flavour of 6809, but I couldn't rememebr what speed of whether it was an -E version, so I grabbed the latest equivalent list. I wasn't listed... But I was sure I recognised the number, so I looked in my older list. It was there. A 68B09. I also found a device I was looking at the other day, and which I suspected was a microcontroller (and isn't in the latest list) is listed in the older one as a 68488 ()which is what I deduced it to be after spending several hours downloading data sheets from the web and trying to match up pinouts). Argh! So a warning : Devices are sometimes removed from this equivalents list. You need to check all of them to see if it's listed anywhere. -tony

14 years, 4 months

Help with running RT-11 SAV files under RSTS/E

by jhfinedp3k＠compsys.to

I have been interested, of late, in fixing some of the bugs in MACRO.SAV / CREF.SAV which the documentation shows also run under RSTS/E. In addition to fixing the bug so that the year outputs as 4 digits on the listing, I thought it would be interesting to run MACRO.SAV as a system job. This requires a mapped RT-11 monitor to use VBGEXE.SAV to load and initiate MACRO.SAV since it is obviously not an REL file. However, the goal is to still be compatible running under RSTS/E. My question is how to distinguish between a mapped RT-11 monitor and RSTS/E? Does anyone have sufficient information about the RSTS/E environment to be able to distinguish RT-11 from RSTS/E? TSX-PLUS is trivial since requesting the TSX-PLUS job number is not supported under RT-11, so that problem is solved. Jerome Fine

14 years, 4 months

Solid State Disk replacement for RD53, 54, RK05, RL02/02

by emu＠e-bbes.com

Rob Jarratt wrote: > There was a thread recently on the comp.sys.dec newsgroup which ended up > with the suggestion from David Riley that he would be prepared to build an > FPGA-based board with a QBUS interface on one side and an SD interface on Is there really still interest in it ? I put my design away few years ago, as I didn't see anybody interested enough to buy one. There is the seasonal talk of it for sure, but ... OTOH, they old ones show up on ebay frequently, and they are not that expensive. Remarks ? Cheers

14 years, 4 months

Mark 8 / Apple I kits

by aek＠bitsavers.org

FYI obtronix has listed several sets of these kits on eBay 120546035352 120546028173

14 years, 4 months

Finding datasheets on the net (was Disc analyser news update)

by tshoppa＠wmata.com

Dave wrote: >On Mar 19, 2010, at 8:44 PM, Ben wrote: >>> And now, I can get datasheets for pretty much any random component in >>> seconds, rather than having to wait for weeks to find a copy of a >>> databook that I don't have. I have nearly three thousand PDF >>> datasheets >>> now, and those are just for parts that I've been interested in for >>> one >>> reason or another. (curiosity, repair, use in new design, found a >>> chip >>> somewhere and wanted to know what it is, etc) I have about 35-40 >>> databooks, and now I have FAR more useful information available to me >>> then when I used to use those databooks regularly. >>> >>> Not all change is automatically bad. >> >> 3 am I want to check a datasheet ... it is 30 seconds including the >> time >> I take to turn on the light switch. >> I need to use windows and the internet it is about 20 minutes later >> I may have the information. > That's because you use Windows. I get it in seconds. Every time. A couple random thoughts: Google goes through phases where searching for a random TTL or CMOS or old microprocessor or transistor part number returns 95%+ sponsored spam links to places that don't have the part but want to sell you the part anyway. At other points Google is working "nicely" and the top couple hits are to the actual datasheet. If the part is a "basic part" that is still available in some commercial form or another I find that going to Mouser or Digikey is often more effective today than going through Google. And I say that being a big Google user. Mouser and Digikey tend to keep parts in their search engines with links to datasheets for maybe a decade or two after they leave special order. And it's useful to know that yes, the CA3146 is being discontinued. Or that the CD4007 is actually the same as the CA3600 :-). Lots of Windows installations have a zillion spyware things running that interfere greatly with downloading the PDF after you find it. Sometimes these things make you believe that they're actually toolbars, but they aren't. Usually the download accelerators fall in this category too... launching 50 simultaneous download sessions to fetch a 3 page datasheet is usually a big loss. I know that I'm being OS-ist when I talk about Windows like that, but really it's the unknowing users getting sucked into thinking "another toolbar? Hey, I want that!" and "another download accelerator? Hey, I want that!" that are at fault. When you see a web browser and literally 75% of the screen is taken up by toolbars and download accelerators that really are actually all spyware, something is seriously out of whack, but I'd estimate that probably 90% of Windows PC's that are not vigilantly patrolled end up that way. Tim.

14 years, 4 months

Datasheets and modern display technology

by shoppa＠trailing-edge.com

I appreciate the old databooks very much... but with bound books keeping them open on the bench to the page you want was always a problem. Anything without a good binding fell apart 30 years ago. Even the ones that are well bound (e.g. the hardback TTL books from TI) don't last forever although they were printed by the millions and are still readily found. What I actually like, is having a big 23" or bigger screen at the bench with web access to the datasheets. That's pretty decent. I can zoom the pinout big enough that I can read it from the other side of the bench, or I can open the pinout and the state table simultaneously in two windows. Pretty good, at least as long as I have my glasses on. But the screen still isn't as good as having the datasheet right there on the bench (flat on the bench) a foot or less away from the circuit. I wonder how a Kindle will do on the bench? Anyone drop their soldering iron on a screen yet? The good pages in the databooks always had solder or food or both on them, that made the good pages easier to find! And don't bother lecturing me about not having food and solder in the same place. We all grew up with solder when we were kids, and everyone knows that WE'RE PERFECTLY NORMAL now that we're adults! Tim.

14 years, 4 months

HP 7937H CS/80 drive free for parts

by js＠cimmeri.com

Folks, I've a 7937H that turns on and passes diag fine, but as soon as I try to access it, I get a servo error. I suspect the HDA assembly but have no spares to swap to confirm. The entire drive is free for pickup from Rockville, MD. If you want small parts shipped, there will be a charge for shipping and handling... Email me if interested. This notice will be in effect for 1 week >from date of posting. After that, please disregard.. Thank you, John Singleton jsk at cimmerik.com (remove all the k's)

14 years, 4 months

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test-drb March 2010