test-drb March 1999

test-drb@ccmp.vtda.org

191 participants
1003 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maybe something equally out of date, let me know where you would use them 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, 8 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, 8 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, 8 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, 8 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, 8 months

Computer busses....

by edick＠idcomm.com

-----Original Message----- From: Tony Duell <ard(a)p850ug1.demon.co.uk> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Tuesday, March 30, 1999 4:33 PM Subject: Re: Computer busses.... >> >> You've hit most of the important signals. One I'd add, however, is a data >> bus disable, and perhaps an address bus disable as well. This would allow a >> front panel or other bus mastering device to steal cycles under certain >> circumstances. > >He's got BUSreq/BUSack. That's all you really need for a DMA device (at >least if those signals have similar definitions to the Z80 ones of that >name). When the Z80 gets a Busreq, it tri-states the internal >address/data buffers IIRC, and you can use BUSack to tri-state the >external ones that you should have added. While it's true that's all you'd need, it's not all you might want, and while I agree that you can and probably should do that, I've actually seen it done more by using the processor to do much of the work by jamming a jump to a front-panel-or diagnostic-card-resident monitor. I doubt, however, that I've seen this stuff more than a dozen times altogether. I've seen plenty of front-panels which were connected only to make the lights blink. >A frontpanel can easily be implemented as a DMA device using those signals. > >-tony >

25 years, 8 months

Looking for 8008 language software (PL/M, MASM, BASIC,...)

by jlewczyk＠his.com

Hi. I'm new to the list and this is my first posting. I am looking for PL/M cross compiler that Intel produced for the 8008 CPU. I have the Intel manual, but no source or object for the language compiler, which was written in Fortran by Gary Kildall when he worked for Intel back in ~1973. I have source for an 8080 version of PL/M from Intel which went into the public domain at some time, but I do not believe that it will produce 8008 code (that ability is not mentioned in the documentation). Any help or information on this would be appreciated. Also, a macro assembler or a basic interpreter would also be appreciated! Anything would be better than hand assembling and jamming in bytes via switches. Thanks, John - John Lewczyk - IO Consulting - 401 Queens Row Street - Herndon, Virginia 20170-3131 - jlewczyk(a)his.com

25 years, 8 months

Vector Graphic range...

by fauradon＠pclink.com

Is the Vector3 also an S100 machine? If so: WOW I have an S100 machine and didn't know about it! There is a small picture of it at the Sanctuary site in the Miscelaneous part of the museum. Francois --------------------------------- Visit the oh so neglected sanctuary at: www.pclink.com/fauradon >Vector Graphic made a range of machines starting with the Vector I. I am not >familiar with all of them, but I believe they were all S-100 machines. The >machines I have are the Vector 1, 3, 4, and MZ. I am not familiar at all >with the Vector Graphic B; I would pick it up just out of curiousity. All of >the machines I have run CP/M. Are you talking about the UCSD P-System? If >so, I didn't think that was an operating system, but rather something more >like an interpreter. >

25 years, 8 months

Timonium Hamfest

by SUPRDAVE＠aol.com

In a message dated 3/31/99 8:42:47 PM Eastern Standard Time, rigdonj(a)intellistar.net writes: > That's exactly right. A lot of the vendors have sold their stuff and > left by 1:30. That why you found piles of trash that they'd left. I > usually register as a vendor and pay the extra fee just so I can get in > ahead of the public. I can tell you for a fact that the BEST deals happen > long before the public gets in the door. If I couldn't get there before > 1:30 I would bother going even if it was across the street! agreed. there's a hamfest thats coming up in two weeks here and a friend and i are going as vendors with a small cache of junk to sell. the best deals can be found the night before when everyone is still setting up. still havent gotten over being 30 seconds too late buying a small robot...

25 years, 8 months

Terak software

by lemay＠cs.umn.edu

I finally got one of my Teraks setup again, and started going over the old software collection. Played a game of Asteroids, perhaps i'll try rogue next. I dont think the guys who were working on PacMan ever completed that game for the Terak, Dang it. I suppose that one was pretty tough to animate on a LSI-11, 70's based computer system. Does anyone know if there are any ftp sites that contain Terak software, or perhaps RT11 for the Terak? I have a few operating systems, a couple UCSD P-system versions and of course MMOS (Minnesota Microcomputer Operating System which is strongly based on the UCSD code). I might have a Basic compiler, and possibly FORTRAN, but i'm not sure if they are complete or usable. -Lawrence LeMay lemay(a)cs.umn.edu

25 years, 8 months

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test-drb March 1999