test-drb August 2001

test-drb@ccmp.vtda.org

295 participants
726 discussions

by mmcfadden＠cmh.edu

Pointer to miniscribe 3085 http://www.thetechpage.com/cgi-bin/db/db.cgi?displayItem=1832 heads 7 cylinders 1170 sectors 17 Mike mmcfadden(a)cmh.edu

24 years

Solbourne VME Boards

by Diff＠Mac.com

Hello, I was just working on my Solbourne 5/600, and I decided to take a look at its VME boards. Unfortunatly, the Solbourne Shack webpage offers little information on identifying boards, and the few images of VME boards are no longer availible. So here are some of the boards I am curious about. The first board is labled Heurikon on both of its tabs, and has the following lables over its connectors: Serial, FPI, FMS 1 2 3 4 (over a set of LEDs), reset, and SCSI. It seems to be a Motorola M68000 board of some sort as it has two small chips on it which are labled MC68000R10 and MC68450RC10, with further markings below them. Board number two is a 6U VME card with 4 large AMD branded chips on it, and two sub boards which lie flat on the VME card, it has a 10 pin plug on the back (just pins, it is 5x2) which extends from a daughter card which has an AMD chip labled Am29000 - 16GC, a minidin connector, 2 small LEDs, and then 4 large bulb like objects, which are alternatingly black, and red, the connectors for those are labled AT&T. I then have 4 boards which are covered with chips, the majority of which are TI or Philips (?) branded. The ones which are in sockets have MX07?? or MX7?? (with ? representing any number) on them. These boards have no external connectors, nor back plates. Finally, I have a board with the Solbourne logo on one tab, and MUX on the other, and it then has 3 50 pin cables along the rear. It seems highly likely to me that this is a Xylogics 781 16-port MUX. Anyone know what these cards are? Zach Malone

24 years

Are office people really that, umm shall we say...slow?

by DAW＠yalepress3.unipress.yale.edu

Here's a little help, I think :-) ... ! > For those of you who think it's unneccessary, let's see how ! > you do with ! > the connectors on the PC/XT on my desk : ! ! I'll try, but I don't know what a DA or DC is. Are they the proper ! names for what many people would still call a db connector? ! ! > ! > Slot 1 : Female DA15, Female DB25 ! ! don't know 15 - joystick port, 25 is printer port, and I bet these go to the same card as slot 5, the DB 9 and DB25 serial ports... ! > Slot 2 : 6 Ribbon cables come out (a) ending in a male ! > DC37, (b,c) ending ! > in female DB25s, (d,e) ending in male DB25s (narrower ! > ribbon cables than ! > b,c), (f) ending in a female DC37 ! ! No idea, but from you, probably something homemade :-) Hard drive controller? ! > ! > Slot 3 : Pushbutton switch, Mini-DIN 6 ! ! The switch might be a reset, but no idea on the mini-din 6, ! M$ bus mouse ! perhaps? ! ! > ! > Slot 4 : RCA phono socket, female DE9 ! ! That's your video card I think. ! ! > ! > Slot 5 : Female DE9, female DB25 ! ! serial ports ! ! > ! > Slot 6 : Female DC37 ! ! again, I 'm not sure what a DC connector is.... is it a floppy ! controller? I can't recall the pin count. ! ! > Slot 7 : Male DB25 ! ! parallel port? ! > ! > Slot 8 : Female DC37 ! ! a second floppy controller? ! ! > ! > Also on the back : another male DB25, female 5 pin DIN, ! male and female ! > IEC mains connectors. ! ! The DB25 could be another parallel port, the din 5 your ! keyboard, and I ! don't know what IEC is, but since you say mains I assume that's your ! power cord and monitor power points. ! ! > I'll be impressed if anyone identifies all of the above. ! ! I might do a better jon, if I actually had the computer in ! front of me, ! even if I didn't pop the top. ! ! Chad Fernandez So, how did we do? --- David A Woyciesjes --- C & IS Support Specialist --- Yale University Press --- mailto:david.woyciesjes@yale.edu --- (203) 432-0953 --- ICQ # - 905818

24 years

3 chip video output (OT, I guess)

by mcguire＠neurotica.com

This is great, Tony, thanks! I will try to find a handful of those SAA5245 chips. I work primarily with PICs, so an I2C interface is very handy for me. You rock. -Dave On August 27, Tony Duell wrote: > I forgot to answer an earlier message asking just what the 3 chips were > that you could use to get video output from a microcontroller system > > 1) An SAA5243 (for the UK/Europe -- I think the 60Hz-vertical version is > the SAA5245) This is actually a teletext display IC for televisions, and > is controlled via an I2C bus (2 wires). The nice feature is that the > display memory can be read/written via the I2C bus, so it can be used as > a general-purpose video display. Actually, this chips is probably > discontinued, but there are more recent chips with the same features, and > anyway the SAA5243 is easy to get either from scrap TVs (the > Thomson/Ferguson ICC5 chassis, for example) or from TV spares places. > > 2) An 8K*8 static RAM, like a 6264 > > 3) Some way of generating a 6MHz clock. A 74LS04 + a crystal, for example. > > You might want to put some kind of buffer chip on the outputs of the > SAA5243 (I used a 74LS541 when I built something like this) which would > increase the chip count to 4 chips. > > The I2C bus needs 2 lines from the microcontroller (clock and data). Each > line should be capable of being driven as an open-collector output, and > read as an input. The port lines on a PIC are fine. You don't need access > to the microcontroller bus. > > You get a 40*25 text display (upper and lower case) with teletext-style > block graphics and serial colour attributes. Not bad for 3 chips and 2 > port lines. > > There was an article on doing this in Datafile (HPCC (UK HP calculator > user club) journal) in 1998/1999 (either the last issue of 1998 or the > first issue of 1999 I think). > > -tony -- Dave McGuire Laurel, MD

24 years

Just curious about injection molding or casting

by mmcfadden＠cmh.edu

Plastic/metal replacement computer parts, I'll bet the train hobbyists have some knowledge about recreating metal/plastic parts for computers. I have seen articles about how they have created/machined/cast entire trains from raw materials. Pointer to site for manufacturer of miniature machine tools. http://www.sherline.com/ Mike mmcfadden(a)cmh.edu

24 years

Paint Curing WAS:Re:Room for Collections

by pete.rickard＠carlingtech.com

"Iggy Drougge" <optimus(a)canit.se> wrote: > The device in the kitchen for baking small spray-painted articles > can be used for pizza and muffins. [Pete Turnbull] I read in Electronic Musician, or some similar mag, of a way to get a professional enamel finish on metal 19" rack plates: the author said to place the spray-painted piece into an oven set at 200 deg F, turning off the heat after closing the door. Do you have any experiences on getting a smooth, durable finish, etc. ? TIA, -Pete - - - - - Pete Rickard Carling Technologies Plainville CT [USA]

24 years

Finds in Houston

by jrkeys＠concentric.net

I spent the last 4 days down in Houston and had a chance to shop for about 2 hours during the trip. I picked up the following: 1. Commodore CBM Model 8032 2. Commodore CBM Model 4040s Dual drive floppy disk unit. 3. Itellivision Computer adapter model 4182 with attached keyboard. 4. IBM 3299-002 5. AMIGA 1010 ext. 3.5 FD 6. Timex Sinclair 2068 in the box 7. Sega-CD model 1690 There were a couple more items but they are not yet 10 so I will list them another time. I wish I had a little more time to look on this trip every store I went into found something. Keep computing.

24 years

more PDP-11 / PDP-12 scans up

by mrbill＠mrbill.net

Various PDP-12/LINC brochures: http://www.decdocs.org/docs/pdp12 An 11/23 brochure: http://www.decdocs.org/docs/11-23-brochure More stuff on the way (price lists, etc). This is just what I got done the other night. 8-) Bill -- Bill Bradford mrbill(a)mrbill.net Austin, TX

24 years

CBM 8032 SK (& electronics)

by mcguire＠neurotica.com

On August 24, Adrian Vickers wrote: > >Something which (as you'll come to discover if you hang around on > >classiccmp) I don't care much about. It is certainly well down with > >respect to functionality. > > That's fair enough. Personally, I doubt any of the older computers are > *truly* elegant internally - there was too much learning going on. I'm not > even sure if it's true of modern computers either. > > Of course, you'll prove me wrong now... ;) I dunno about that. In the past 24 hours, I've worked on the innards of an SGI Onyx, an AlphaServer 2100A, and a PDP11/34a. I'll take the 25-year-old PDP11 over any of them, physical design wise. Having seen the inside of a recent PeeCee a few weeks ago, there's NOTHING elegant going on there. Now a Cray T90 (a relatively recent Cray vector supercomputer) with its motorized zero-insertion-force connectors...now THAT'S elegant. But it could afford to be. > However, whilst I like the idea of learning embedded systems, I'll probably > start simple and use a Z80 or similar - I can't (yet) think of anything > where I'd use some super-fast chip. Incidentally, what's with these PIC > chips? They seem to be very popular at the moment. PIC chips kick butt. They're wonderful. I use the CCS C compiler, which is very nice and comes with LOTS of example code in the form of "drivers" for various popular chips (I2C EEPROMs, Dallas Semiconductor serially-interfaced RTC chips, iButtons, etc) that have proven extremely useful. It also directly controls the PicStart programmer as well as a few others. The downside to the CCS C compiler is that it runs under Windoze...not having any (and not wanting any) Windoze crap here, I fired up a copy of VirtualPC on my G4 Mac; it runs nicely under that. There are a LOT of different PIC chips available, from the older 16C54 to the incredibly popular 16F84 (the only one anyone ever hears about, rather stupidly IMO because there are MUCH better ones), to the 16C745 with an on-chip USB interface. -Dave -- Dave McGuire Laurel, MD

24 years

pdp 11/94 available

by dancohoe＠oxford.net

I found two of these at a wreckers in Toronto on Friday. I bought one, but likely the other one will be available for a few hours Monday before it goes down. I didn't see any racks to go with them. If anyone is interested, I could see what I can do. I wouldn't be too difficult to get it to any of Detroit, Buffalo, Syracuse, Ottawa-Montral areas.

24 years

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test-drb August 2001