test-drb April 1999

test-drb@ccmp.vtda.org

170 participants
1190 discussions

by edick＠idcomm.com

If they're Intel parts, I think they're a variation of the 2117, which is an Intel version of the 4116. It may, however, be the other way around, i.e. the 2117 may be the variant. Back in those days, Mostek was the leader in DRAM technology and the 41xx number is essentially theirs, though other manufacturers used it as well. The National numbers differed from this practice. Their equivalent was the MM5290. I'll have to go back and verify all this, but I do believe that they can safely be replaced with 4116's or their equivalent. Dick -----Original Message----- From: Joe <rigdonj(a)intellistar.net> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Monday, March 29, 1999 2:58 PM Subject: Re: 4116's and other memory >Dick, > > I have a machine that uses 2116s. What are they? Fortunately I don't >need any at the moment but let me know if you have any so I'll know where >I can get them if I have to. > > Joe > >At 10:57 AM 3/29/99 -0700, you wrote: > >>If you have other "old" memory needs, e.g. 2115's (Intel 1kx1's, 25 ns) or >>maybe something equally out of date, let me know where you would use them >>and maybe I can help you out. >> >>Dick >>-----Original Message----- >>From: Megan <mbg(a)world.std.com> >>To: Discussion re-collecting of classic computers >><classiccmp(a)u.washington.edu> >>Date: Monday, March 29, 1999 10:43 AM >>Subject: Re: Picture of my latest haul >> >> >>> >>>>Who was the nut who mounted the CPU units near your ankles? Looks like >>>>you're suposed to lie on your belly in order to read the displays and >>>>toggle the switches! >>> >>>Well, the lowest of the machines (the pdp-8/e and pdp-8/f) were >>>actually not even configured for operation... they were simply >>>stuck in the racks, taking up space. The 8/f now has a home with >>>Allison, so there is empty space in the 11/34 rack... which I will >>>probably fill with an RL01 (or RL02 if I can find one). >>> >>>The pdp-8/a, which doesn't have any blinkenlights, was the actual >>>operating machine for the person who owned it before... its >>>backplane can handle a hex board, which was required for the RL8 >>>controller, apparently. >>> >>>The 8/e is currently out of the rack as I figure out what I'm going >>>to do next... >>> >>> Megan Gentry >>> Former RT-11 Developer >>> >>>+--------------------------------+-------------------------------------+ >>>| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | >>>| Unix Support Engineering Group | (home): mbg!world.std.com | >>>| Compaq Computer Corporation | addresses need '@' in place of '!' | >>>| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | >>>| Nashua, NH 03062 | "pdp-11 programmer - some assembler | >>>| (603) 884 1055 | required." - mbg | >>>+--------------------------------+-------------------------------------+ >>> >> >> >

25 years, 2 months

Messed up Apple (clone) video

by ds_spenc＠alcor.concordia.ca

Hi, Along with a dead 4116 (which I recently replaced with a hacked 4164), my Microcom II+ (Apple II+ clone) has a video problem which has kept me >from using it for the past few years. Usually when it's cold, the display is a complete mess. As it warms up, the image becomes clear but in four parts. Each quarter (corner) of the screen is a mini-image of what should be displayed on the whole screen. Out of each group of four pixels of what would be displayed normally, each will be displayed in a different quadrant of the screen. After about 10 minutes, the screen becomes normal, with occasional "zaps" and returns to the quartered screen image. Just about everything in the II+ is TTL, so it's probably just a matter of knowing which piece of TTL to replace. Does anyone know? I'm looking at the schematics (for a _real_ Apple II) now, but I have no idea how to locate the problem because there are several lines leading to the video output, and the problem chip may be farther back into the curcuitry and not connected directly to the output. I know that some of you are fairly expert with Apple hardware. I want to get the Microcom II+ working because it's the only machine I've got that's capable of using my Z80 Softcard or my SMC-II Light Pen. Neither will work in my Apple //e. Besides, it also has a better keyboard than the //e, once it's been worked in to cure the 'bounce'. (As an addition note on the machine's history: The machine was repaired at the Microcom store in early 1987, and it came back with a loose, drifty keyboard. I found out the reason was that the keyboard's curcuit board had been cracked and the keyboard only works if it's not screwed in too tightly. I'll get around to looking at that after the video is fixed. It's just one corner that's folded a bit, but there are traces on there! The keyboard tends to report the wrong characters when it's screwed in properly.) -- Doug Spence ds_spenc(a)alcor.concordia.ca http://alcor.concordia.ca/~ds_spenc/

25 years, 2 months

4116's and other memory

by edick＠idcomm.com

In the event any of those reading this list are in truly desperate need of 4116's to resuscitate you elderly computers, please let me know. I have a supply of these which though limited is excessive. They're yours for the postage, provided you have an otherwise running system in which to use them. There should be no need for disfuguring an original board in order to make a part foreign to its design work in place of what belongs there. I also, incidentally, have some of the 18 (?) -pin dual DRAMs made for the Apple-III's memory board, and, in fact, have a spare apple-iii memory daughterboard which is serving no useful purpose here. If you've got an apple-III with memory problems, perhaps this is for you. If you have other "old" memory needs, e.g. 2115's (Intel 1kx1's, 25 ns) or maybe something equally out of date, let me know where you would use them and maybe I can help you out. Dick -----Original Message----- From: Megan <mbg(a)world.std.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Monday, March 29, 1999 10:43 AM Subject: Re: Picture of my latest haul > >>Who was the nut who mounted the CPU units near your ankles? Looks like >>you're suposed to lie on your belly in order to read the displays and >>toggle the switches! > >Well, the lowest of the machines (the pdp-8/e and pdp-8/f) were >actually not even configured for operation... they were simply >stuck in the racks, taking up space. The 8/f now has a home with >Allison, so there is empty space in the 11/34 rack... which I will >probably fill with an RL01 (or RL02 if I can find one). > >The pdp-8/a, which doesn't have any blinkenlights, was the actual >operating machine for the person who owned it before... its >backplane can handle a hex board, which was required for the RL8 >controller, apparently. > >The 8/e is currently out of the rack as I figure out what I'm going >to do next... > > Megan Gentry > Former RT-11 Developer > >+--------------------------------+-------------------------------------+ >| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | >| Unix Support Engineering Group | (home): mbg!world.std.com | >| Compaq Computer Corporation | addresses need '@' in place of '!' | >| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | >| Nashua, NH 03062 | "pdp-11 programmer - some assembler | >| (603) 884 1055 | required." - mbg | >+--------------------------------+-------------------------------------+ >

25 years, 2 months

Apple stuff....

by roblwill＠usaor.net

Does anyone have (or know where to get) an old (b/w) Apple ImageWriter printer for under $20? I also need a cable to connect an Apple //c to a printer. ThAnX, -- -Jason Willgruber (roblwill(a)usaor.net) ICQ#: 1730318 <http://members.tripod.com/general_1>

25 years, 2 months

Hard-sectored 5.25" disks

by rigdonj＠intellistar.net

At 06:34 AM 3/28/99 -0500, Doug wrote: >Maybe next month I'll drag home something with an 8" drive. :) > Doug, how far are you from British Columbia? I know where there's a Tektronix 4051 AND a 4052 up for sale. Both can use optional 8" drives, I think they have drives but I'm not sure. I'm in Florida, so it's a mite too far for me to go get. Joe

25 years, 2 months

New arrivals to the Vintage Computer Festival Archives!

by bill＠chipware.com

> They've gotten bent and misaligned during the journey this thing took from > General Electric's Nuclear Division to my warehouse. Uh... Doesn't glow in the dark does it?

25 years, 2 months

RLV11/RL02 ->11/73?

by jpl15＠netcom.com

This message is for Zane Healy, but I thought it would maybe help some others on The List. First: Many, Many thanks to Dave Jenner, from whom (in Seattle) I recieved a kilopound of RL02s and related items. I am still sorting thru things, in a desperate pitched battle to reclaim at least part of my house from my 'collection' ;] In a box (from Dave, IIRC) I have found (3) three RLV11 cardsets, the printsets for same, and the printsets and drawings for the RL01 and 02. This is kinda like going thru the pockets of an old coat and finding a couple of hundred-dollar bills (pound notes, Deutschmarks, Rupees, etc...) I know that Zane has successfully attached RL02s to his 11/73, and I wanna do that, too... The 11/73 has an RQDX2 and one RX02 8"... tell me how much more info to provide and I'll do that. I'm going to try to install the boards, but the little backplane is stuffed and I need to re-arrange some things. Wait... will RLV11s go in the 11/44??? That would be major cool, as well... I need so much more doc than I have here right now, and my ISDN line is down (thanks a bazillion, GTE) so surfing the web's a pain... waah waaaahh wahh whiney luser lart lart lart. Cheers and Thanks John

25 years, 2 months

FW: Many older computer books, software manuals, and electronic data books (last chance moving sale)

by kyrrin＠my-dejanews.com

I don't know if this fellow has anything of interest or not, but the documentation hunters may want to contact him directly... -=-=- <break> -=-=- On Sun, 04 Apr 1999 03:41:25 GMT, in comp.sys.ibm.pc.misc you wrote: >>From: Tiger(a)nospam_address.org (Tiger) >>Newsgroups: alt.marketplace.books,misc.books.technical,comp.sys.ibm.pc.misc,misc.forsale.computers.other.misc >>Subject: FS: Many older computer books, software manuals, and electronic data books (last chance moving sale) >>Message-ID: <371bde4e.25263337(a)news.silcom.com> >>X-Newsreader: Forte Agent 1.5/32.452 >>X-No-Archive: yes >>MIME-Version: 1.0 >>Content-Type: text/plain; charset=us-ascii >>Content-Transfer-Encoding: 7bit >>Lines: 56 >>Date: Sun, 04 Apr 1999 03:41:25 GMT >>NNTP-Posting-Host: 207.71.222.92 >>X-Trace: newsfeed.avtel.net 923197029 207.71.222.92 (Sat, 03 Apr 1999 19:37:09 PST) >>NNTP-Posting-Date: Sat, 03 Apr 1999 19:37:09 PST >>Organization: Avtel Communications >>Path: news1.jps.net!news-west.eli.net!newsbox.grin.net!uunet!ffx.uu.net!in2.uu.net!WCG!newsfeed.avtel.net!not-for-mail >>Xref: news1.jps.net alt.marketplace.books:777 misc.books.technical:28 comp.sys.ibm.pc.misc:95 misc.forsale.computers.other.misc:212 >> >>x-no-archive: yes >> >>I'M MOVING VERY SOON. If these items are not gone in a couple weeks they >>will be donated to charity, or I will keep and pay to move them. >> >>Please see the end of this message for my correct email address. >>------------------------------------------------------------------------- >> >>BOOKS - I have a couple hundred computer books, programming books, >>electronic data books, and technical books (a lot of reference books are for >>Apple and Amiga, such as the Addision-Wesley series) -- most are from the >>1980's. I also have a few math and physics textbooks. >> >>If someone were to buy all my books I'd probably sell most of them at an average >>price of $2-$3 each (less if you pick them up in person). There are a few, such >>as the Apple and Amiga development/technical books that I'd want more than >>$5 each. >> >>SOFTWARE MANUALS - a couple hundred manuals without the disks for things like >>Borland Turbo products, Microsoft products (C/C++, Visual Basic, FoxPro, etc), >>DBase III+ and IV, Autocad, etc. If someone were to buy all of these, I'd >>probably sell most of them at an average price of $1 each (less if you pick them >>up in person). >> >>Please look at my lists and feel free to ignore the prices and make reasonable >>offers. My main criteria are: I have to get enough money to make the transaction >>worth the effort and the amount needs to be reasonably close to what I think >>I'll get from my charitable donations. >> >>All of my lists are at: >> >>http://www.silcom.com/~tiger >> >>As I mentioned above, if you can come by Santa Barbara, California, and pick up >>a lot of stuff in person we'll work out a really good deal. You don't have to >>buy *everything* to get a great price but it needs to be a signficant amount. >>I'm tired of wasting my time on small transactions. Anything under $50 is small >>in my eyes and barely worth the trouble. I don't start to get too interested >>until the amount exceeds $100. I have a total of about 500 books to thin out >>in less than 2 weeks (all deals need to be worked out by the end of next week). >>Selling a few books here and there doesn't make a dent. I want someone to >>clean me out of most of my books! Aren't there any computer book museum >>collectors? >> >>-------------------------------------------------------------------------- >>Send email to tiger(a)silWXYZcom.com - Remove WXYZ to reply. >> >>For other computer hardware, software, and books for Amiga, Apple, Atari, >>Commodore, IBM, Macintosh, and TI-99/4A please visit my web page at: >> http://www.silcom.com/~tiger >> >>I'm requesting a $20 minimum transaction (before shipping). Money orders >>are required because I no longer have time to wait for checks to clear. >> >>This will probably be the last time I post these items for sale. If you're >>interested in something, buy it now or never. -=-=-=-=-=-=-=-=- Bruce Lane, Owner and head honcho, Blue Feather Technologies -- kyrrin (at) bluefeathertech [dot] com Web: http://www.bluefeathertech.com "...No matter how we may wish otherwise, our science can only describe an object, event, or living thing in our own human terms. It cannot possibly define any of them..."

25 years, 2 months

homemade computer for fun and experience...

by edick＠idcomm.com

memory mapping would be a mite silly, wouldn't it, given that the HERC uses 64K of refresh RAM. I'd say the way to do it is to use a strategy put forth by the guys who designed the 6545, the '65xx' version of the 6845. It had an update register which essentially allowed you to write an address to the chip and then send a stream of characters, kind of like the cursor addressing on a terminal. Some scheme like that would work even in the limited I/O space of a Z-80. Another option might be to bank the BIOS such that when it's writing to or reading from the video page, it has a space equal to the disk buffers, which works as a window in the display RAM. The refresh of the display would keep the entire video memory refreshed, while the banking scheme could minimize the memory consumption of the video device. The PC certainly has made for cheaper serial/parallel interfaces than we ever saw for the S-100. It's too bad there were never any truly general purpose parallel ports use commonly enough on the PC to make them cheap. It's only since the adoption of the 1284 standard that bidirectional I/O via the printer port has been practical. It's too bad there aren't i8255-equivalents which can drive something. The problem with my IMSAI PIO-6 is that it won't even drive an LED directly. Dick -----Original Message----- From: Allison J Parent <allisonp(a)world.std.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Saturday, April 03, 1999 8:54 PM Subject: Re: homemade computer for fun and experience... ><What might be fun would be an S-100 card to serve as an interface to a ><Monochrome/Hercules equivalent card and an IBM-style keyboard, since these > >They do exist! Hercules made cards for the s100 machines that ran DOS! > ><Fire). One of those little switch boxes would serve just fine. The 8.0 MH ><Z80 wouldn't be sufficient to drive a VGA, so no need for anything fancy. > >Why not? I'm currently planning to use ISA16 and herc video for a z280 >system. Z280 has a 16 bit bus mode. The only thing needed to support >herc using a z80 is a MMU to allow mapping the display out of the address >space so that you have room for CP/M. I've done some testing to verify >this will work. > ><It could even support two short ISA cards. > >More if you buffer the bus! > >Allison >

25 years, 2 months

Floor tiles

by william＠ans.net

Here is a dumb question... Are European floor tiles for computer rooms 2 feet square, like those found in the U.S., or are they smaller? I am trying to find out how big the ETA-10P Pipers are, and I have picture that has a floor tile as a reference. The image, http://www.tno.nl/instit/fel/museum/computer/eta10p.jpg, is rather funny looking, as the people make the box look small. William Donzelli william(a)ans.net

25 years, 2 months

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test-drb April 1999