test-drb

test-drb@ccmp.vtda.org

101090 discussions

by mark＠markesystems.com

>> Not sure why you have VARCHARs for primary keys, why not use the >> conventional auto-increment int so you can dispense with >> the LastGeneratedArtifactID table. >> > Because my artifact ID's are not always just numbers. In some cases > they may already be marked on an artifact (though typically not for > manuals - but this is just the first of a set of such projects, and they > *are* marked on many of my computer boards). You can still force the artifact ID VARCHARS to be unique, and index them as well, of course. There are at least a couple of reasons to have primary keys that are independent of the "visible" key. First, if the user-visible key ever changes (what if the inventory tag falls off and is lost?), that will break all the links that refer to that record (or else you'll need extra code to handle this). Also, there have been many times when some aspect of a key that's directly tied to an external bit of information needs to change format - numeric to character, or length change, or... This too will break things. > No, I don't need made up primary keys. The other tables have the keys > they need to guarantee uniqueness - in some cases the PK is made of up > two or more columns. I seriously dislike the current fad of inventing > such keys when they are not needed. I too used to develop new databases this way, figuring that since a certain bit of information is guaranteed to be unique (or that I want to guarantee its uniqueness), I'd use that for the primary key. After getting bitten more times than not, I now almost always create an auto-number key whose only purpose may be for internal linkage. (I recently developed a project using Zoho Creator, which was a learning experience to say the least. It's worth noting that an explicit ID field is part of *every* data table that you can create there - there's no way around it. And, it turned out that it was pretty darn helpful a lot of the time, too.) >> Another thing, although MySQL is fine but for this I think SQLite might >> be a better choice of db. Its access methods are all in-process ie. no >> external >> dbms service to bother with, just a library to link in and the physical >> database is a disk file (.s3db extension). It has a much 'lighter' db >> footprint. >> > As I mentioned in another response, I truly dislike SQLite, based on my > experience with it on my Garmin GPS. I'm still not sure why - my experience has been very good. What bad experiences have you had? ~~ Mark Moulding

10 years, 7 months

Interlisp-D (Medley) "display font" disks for the 1186?

by derschjo＠gmail.com

Hi all -- I've been working on getting a Xerox 1186 workstation up and running again, using the floppy images on Bitsavers. I have the "Medley" Interlisp-D software installed (after writing out and installing from ~25 floppies) and running and I'm attempting to load in the related libraries and software (another 10-20 floppies or so). Some of these libraries have dependencies on various font files, which I do not seem to have and haven't been able to track down. I see vague references in the documentation to a floppy disk set labeled "Display Fonts" but these do not appear to be on Bitsavers. From writing out a few floppies and looking at their contents on the 1186, I do not believe that these have any relationship to the Viewpoint Font disks (though if anyone knows differently, do let me know). Anyone out there have any experience with this? Anyone happen to have these floppies and/or images of them? Thanks as always, Josh

10 years, 7 months

Flexowriter

by billdegnan＠gmail.com

Anyone out in CALI (I think he said Santa Cruz) who is looking for a very nice condition Flexowriter with desk. I wish I could take it, but I have a moratorium on new stuff for a while. It's museum quality. Email me privately for more info. I have only seen the pictures, don't know the guy who contacted me to see if was interested (and also willing to buy it), but before it goes on Ebay someone here might be able to snag it. -- Bill vintagecomputer.net

10 years, 7 months

Sources for Old ISA boards

by dj.taylor4＠comcast.net

I've seen the discussion here about sources for old IC's, ones that are out of production, mainly the DEC buss interface chips. Are there places where old PC cards can be found? I mean besides ebay. I'm looking for ISA interface cards that were for Bomem spectrometers, they are probably 20-25 years old.

10 years, 7 months

One more try - Can you ID this S-100 Serial board?

by drlegendre＠gmail.com

(Months along, posts to several boards / lists, still no help on this one.. so I'm giving it another shot. I'd really like to use this board) Been trying to no avail to find any info on this 'MCT' S-100 serial card. I'm pretty sure the card works, as it came from a previously-working system - but all documents are missing, and without the info, I have no idea how to put it to use. Photos are here: https://nerp.net/~legendre/altair/mct_serial_01.jpg https://nerp.net/~legendre/altair/mct_serial_02.jpg Other than what I believe is an artwork / batch number on the rear, the only marking is "Assy 105510" on the front silk screen. My hunch is that this may have been a fairly generic 'OEM' type card which could have been re-badged and sold under one or more different names. So perhaps the docs exist under a name other than MCT? Any help greatly appreciated - thanks! -Bill

10 years, 7 months

update on IBM terminals

by sales＠elecplus.com

The terminals are models 3472 and 3477. The keyboards are Model M. The server is a 3174-11R He did not give counts. Cindy --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

10 years, 7 months

Wanted: BeBox front plastics, IO riser

by ethan＠757.org

Hello all, I have a BeBox 66mhz that is missing the front plastic parts and the IO riser that has all the ports on it. By any chance does anyone have these parts available for sale? - Ethan -- Ethan O'Toole

10 years, 7 months

1985-1989 IBM terminals

by sales＠elecplus.com

Is anyone interested in IBM terminals from roughly 1985-1989? There is a complete system, probably no keyboards. Located upper Midwest US. Cindy Croxton --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

10 years, 7 months

Small glass capacitors polarized?

by jnc＠mercury.lcs.mit.edu

> From: drlegendre > I'm not sure what you're describing. Can you link to a pic of one of > these caps? http://www.electrical4u.com/images/glass-capacitor.jpg > From: tony duell > Incidentally, what are you using those capacitors for? I'm taking a half-filled QBUS memory card and filling it. > Why not some other type? Because on that board, they fitted _underneath_ the DIP sockets, and nothing else will fit down there! > I am pretty sure they are not polarised, you can fit them either way. > In general capacitors under 1uF are not polarised > ... > Anything over 100uF is very likely to be polarised. Thanks, help much appreciated! Noel

10 years, 7 months

IBM 026 - Decision Data 8010 card punch on Ebay in

by marc.verdiell＠gmail.com

Henk, Congrats! What a buy. Gorgeous super-clean machine. The Juki looks almost like a copy of an IBM 029, down to the angled styling and stacker section. Except of course for the color. Marc ============================ From: Henk Gooijen <henk.gooijen at hotmail.com> Subject: Re: IBM 026 - Decision Data 8010 card punch on Ebay in Germany I picked up the Decision Data card puncher last Tuesday. Heavy stuff! I helped the seller move the orange colored card punch. It's a Juki. Also *very heavy*. BTW, the keyboard of the Decision Data puncher is connected with a cable; you can move the keyboard to a comfortable position. IIRC, the keyboard of the Juki is fixed placed on the desk. - Henk, PA8PDP

10 years, 7 months

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