On 20 Sep 1998, Eric Smith wrote: On this list, "classic" means 10 years old or older, for the most part. The 386 already qualifies. However, there is a project (stalled?) to get Linux running on some older 8-bitters: http://www.linux.org.uk/ELKS-Home/index.html -- Doug

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Tony Duell wrote: You're right! I should have paid more attention to the NAQ list. I guess there's simply no refuge from x86 PCs; they invade every newsgroup and mailing list. Not to mention surplus stores; it's getting very hard to find anything interesting because the places are completely overrun with PC crap. As if anyone really wants huge piles of off-brand EGA cards (or any EGA cards), ARCnet cards, etc. Sigh. The only halfway interesting PC-based hardware I've ever found surplus are the XT/370 and AT/370 board sets, and I've never gotten the software for them. If anyone wants them, though, I think Timeline is still advertising them. Be forewarned, however, that they are mapped to the 512K-640K memory address range, so they won't work unless you have a motherboard that can be configured to NOT provide memory in that range. These boards contained three processors, a custom-microcoded 68000 variant to implement the core 370 instruction set, a standard 68000 to implement the instructions that wouldn't fit in the microcode of the first one, and a custom version of the 8087 hacked to do IBM radix-16 floating point instead of IEEE. Too bad no technical docs were ever available, it would be fun to port Linux to them.

At 18:44 21-09-98 +0100, Tony Duell wrote: --snip -- That's true in the States for sure as far as I have seen up here in the Northeast. Lots of the stuff is just plain unidentifiable to the untrained eye. Seems there's not that much good old ham gear and military surplus gear anymore :( The hamfests are overrun with computer related gear now and not the computer gear I'm into (the non-typical home computer stuff, i.e., commercial, business, industrial machines.) I did see an AT/370 boardset about six or eight years ago at the Buffalo Hamfest. Up to that time I had no clear idea what the heck it was. I saw a Moto 68K CPU on it and my interest was piqued (I'm into Moto SBC's, OS-9 systems, etc.) The fellow who had the fleamarket space explained what it was but at that time I was not into collecting classic computer hardware. I wasn't sure of its condition as it was amongst the heaps of PC boards piled in his space and refused it ($20 asking price, I think.) Oh well.... --Chris -- -- Christian Fandt, Electronic/Electrical Historian Jamestown, NY USA Member of Antique Wireless Association URL: http://www.ggw.org/freenet/a/awa/

Unfortunately the 808x machines that run dos are more like the classic micros than modern machines. I'm not willing to be biased against them. After all my Amstrad ppc640 portable(haha) is technically a classic. Don't like microsoft OS? Okay, I'll load DRDOS on it. (it's even free) -- Jim Strickland jim(a)calico.litterbox.com ----------------------------------------------------------------------- Vote Meadocrat! Bill and Opus in 2000 - Who ELSE is there? -----------------------------------------------------------------------

On Mon, 21 Sep 1998, Ward Donald Griffiths III wrote: What the heck, its been a while. We also should do another round of updates. There's been a lot of good information posted in the past few months. It'd be nice to get a FAQ maintainer (hint hint). ============================================================================= DO NOT DISPOSE OF THIS PART OF THE FAQ. THIS IS THE PART THAT EXPLAINS HOW YOU CAN SUBSCRIBE AND UNSUBSCRIBE. IT WILL TAKE ME MORE TIME TO DO THESE THINGS FOR YOU THAN IT WILL TAKE FOR YOU TO DO THEM YOURSELF ============================================================================= ClassicCmp - The Classic Computers Discussion List Part 1 in the ClassicCmp FAQ Trilogy Mail/Internet Basics FAQ (Frequently Asked Questions) v1.3 Last Update: 12/10/97 ----------------------------------------------------------------------------- This FAQ is written with the primary purpose of making readily available answers to the more common questions appearing on ClassicCmp. It is Maintained by Bill Whitson <bill(a)booster.u.washington.edu>du>. The infor- mation in this document has been gathered from a variety of sources but, in general, the members of ClassicCmp should be credited for all contain- ed herein. I have, of course, endeavored to be as accurate as is possible and often failed ;). This FAQ is Part 1 of the ClassicCmp FAQ Trilogy. The information presented deals with the use of mailing lists and internet-specific tools. If you have questions, comments, or corrections (always welcome) please contact me at the address above. A current copy of this FAQ is available on the web at http://haliotis.bothell washington.edu/classiccmp or via anonymous FTP at 140.142.225.188 in the directory /pub/classiccmp/faqs as cclpart1.faq. ----------------------------------------------------------------------------- Updates: Nothing new, cosmetic changes. ----------------------------------------------------------------------------- 1. Mailing Lists ---------------- 1.1 Mailing List Basics 1.2 How to Talk to the Robot How to set to Digest How to Subscribe How to Unsubscribe 2. FTP ------ 2.1 FTP Basics 3. World Wide Web ----------------- 3.1 WWW Basics ============================================================================= 1.1 Mailing List Basics A mailing list is a simple device which takes an e-mail and redistributes it to a group of people. People can add and remove themselves from the distribution list by Subscribing and Unsubscribing. When you send a message to the list, it is first examined by the robot for key words that tell it to process an automatic funtion (like help, subscribe, unsubscribe, etc). If the message does not contain a keyword it is sent to the distribution list. 1.2 How to Talk to the Robot There are a few List Processor commands that you might want to use. To send a command to the list processor, write a message to listproc(a)u.washington.edu (Do NOT send the message to classiccmp(a)u.washington.edu). In the body of the message (not the subject line, that is) write one of the following commands, then send the message. SET CLASSICCMP MAIL ACK Tells the robot to send you a copy of messages you write to the list. This is the default. SET CLASSICCMP MAIL NOACK Tells the robot NOT to send you a copy of messages you write to the list. I don't recommend this. SET CLASSICCMP MAIL DIGEST Tells the robot to send you a digest of messages rather than each as it is posted. With this option you will get a weekly bundle of messages and keep a nice, tidy in-box. SUBSCRIBE CLASSICCMP Your.Address Subscribes you to the list. UNSUBSCRIBE CLASSICCMP Your.Address Removes you from the list. [][][][][][][][][][] 2.1 FTP Basics FTP is a protocol by which files can be transferred over the internet. You can use FTP to connect to a remote site and retrieve files. The commands you use with FTP depend on the software you use. In general you must make sure that you are in BINARY mode before transferring a program file or compressed files. The process of downloading a file is usually termed GET and the process of uploading a file is usually termed PUT. Your FTP program will require an address to connect to. For the ClassicCmp site that address is 140.142.225.188. You then may be asked to log in (unless your program assumes an anonymous login). When asked for a name, use anonymous. When asked for a password enter your internet e-mail address. [][][][][][][][][][] 3.1 WWW Basics The only complicated thing with the WWW is knowing what bells and whistles your web browser supports. You don't really need to know much other than the address for ClassicCmp. The web site is all text which means just about any web browser from the oldest Lynx to the newest Netscape or Microsoft browser should support it. The ClassicCmp site is http://haliotis.bothell.washington.edu/classiccmp. ============================================================================= ============================================================================= ClassicCmp - The Classic Computers Discussion List Part 2 in the ClassicCmp FAQ Trilogy List Specific FAQ (Frequently Asked Questions) v1.6.3 Last Update: 12/10/97 ----------------------------------------------------------------------------- This FAQ is written with the primary purpose of making readily available answers to the more common questions appearing on ClassicCmp. It is Maintained by Bill Whitson <bill(a)booster.u.washington.edu>du>. The infor- mation in this document has been gathered from a variety of sources but, in general, the members of ClassicCmp should be credited for all contain- ed herein. I have, of course, endeavored to be as accurate as is possible and often failed ;). This FAQ is Part 2 of the ClassicCmp FAQ Trilogy. The information presented deals with regular day-to-day issues on the list. If you have questions, comments, or corrections (always welcome) please contact me at the address above. A current copy of this FAQ is available on the web at http://haliotis.bothell washington.edu/classiccmp or via anonymous FTP at 140.142.225.188 in the directory /pub/classiccmp/faqs as cclpart2.faq. ----------------------------------------------------------------------------- Updates: Added: section 1.8 Changed: section 1.3, 1.5, 1.7, 3.1 ----------------------------------------------------------------------------- 1. About the List ----------------- 1.1 What is ClassicCmp? 1.2 Why is ClassicCmp? 1.3 What's a Classic Computer? 1.4 Who runs this thing? 1.5 How come I can never reach this so-called list operator? 1.6 Don't you know you're duplicating what others have done? 1.7 How much mail should I expect to get on this list? 1.8 How long has this list been around? 2. Protocol and Etiquette ------------------------- 2.1 What can I talk about? 2.2 Can I talk about PCs? 2.3 Can I talk about Mini/MainFrames? 2.4 Can I post advertisements? 2.5 Can I ask people to give me their computers? 2.6 Can I ask for help fixing item x? 2.7 Where should I look before posting a dumb question? 2.8 Can I type obscenities about Microsoft in ALL CAPS?!? 2.9 Can I post trophy lists? 2.10 Can I use obscene languagein my posts? 3. Misc List Information ------------------------ 3.1 How many subscribers are there? 3.2 How many subscribers use machine x? 3.3 Is this list archived? 4. ClassicCmp Resources on the Net ---------------------------------- 4.1 Does ClassicCmp have a Web Site? 4.2 How come the Web Site is so ugly? 4.3 Does ClassicCmp have an FTP Site? Collecting ---------- 5.1 Where can I find Classic Computers? 5.2 How much is machine x worth? 5.3 Will thousands of innocent machines be scrapped if I don't save them? 5.4 I don't understand anything. Help! ============================================================================= 1.1 What is ClassicCmp? It's a mailing list for the discussion of classic computers. Topics center on collection, restoration, and operation. It is also an appropriate place for stories and reminiscences of classic computers. Lofty discussions dealing with the philosophical and/or metaphysical aspects of computers are often better handled in private e-mail ;) 1.2 Why is ClassicCmp? Uh, why not? There are lots of people who love these old machines and it seems like a fun idea to get together and talk about them. 1.3 What is a Classic Computer? _Any computer_ that has not been manufactured for 10 years is a classic. This definition is one I made up and it's entirely arbitrary. It seems to work OK, so I've kept it. This definition has come under fire recently but remains the guideline. Remember that it is certainly flexible. The idea is to keep conversation on track, not to restrict what you can talk about. 1.4 Who runs this thing? That would be me, Bill Whitson - email bcw(a)u.washington.edu. 1.5 How come I can never reach this so-called list operator? Sorry. It does often take me several days (sometimes weeks!) to respond to e-mail. I am often away for days at a time and when I'm not I'm still probably busy doing real work. I receive more than double the amount of mail that goes to the list in the form of spam, bounced messages, odd user requests, general bitching, etc. and I still have to filter out the messages I actually have to respond to, to remain employed ;). I will get back to you eventually. As an update, I've been _really_ hard to reach for the last couple months. Hopefully, this has now changed. Please keep in mind that this list is recreation for me, and I sometimes cannot devote any time to it. This does not indicate a lack of interest in the people or activities involved. 1.6 Do you know you're just duplicating work other people have done. I get a "reinventing the wheel" e-mail at least once a week. If you show me another group of computer collectors that claims a membership as large as this one I'll show you a group that must be very hard to find. Obviously there are other groups of collectors and I'm cheering them on - I don't see a problem with duplicating and reduplicating lore that's quickly disappearing anyway. 1.7 How much mail should I expect to get on this list? The daily load varies widely from about 20 messages to over 100. Average seems to be about (I haven't checked lately, will update) messages a day. There are times where the message load peaks for as much as a week. 1.8 How long has this list been around? The first message went out March 13, 1997. [][][][][][][][][] 2.1 What can I talk about? Anything related to classic computers as defined above. There are many people on this list that really know what they're talking about, so you might want to check facts before you start shooting off messages. It's also a good idea to actually read the FAQs and check the archives a little before posting. 2.2 Can I talk about PCs? Yes. PCs which haven't been manufactured for 10 years. Even then, be aware that in many cases you would get a better response posting to PC newsgroups. 2.3 Can I talk about Minis/MainFrames/WorkStations/Gigantic Talking Boxes with Flashing Lights & Coundown Timers/Robots from Alien Civilizations? There has apparently been some misconception that this is a list for micros/home computers only. You'll note I said "misconception". 2.4 Can I post advertisements? Sure. As long as they're related to _classic_ computers. And, of course, use your brain - don't spam. Also, please state up-front whether or not you are willing to ship the items you sell outside your country as there are members of this list in a number of different countries. If your post is commercial, please be sure to indicate that in some way in the subject line. 2.5 Can I ask people to sell/give me their computers? Sure. But you're not likely to get a very nice response. Mine, for example, would be: Get your own f***ing computer! There are several people on usenet who will vouch for this. When someone posts about one of their machines without offering to sell it - it's really a pretty good bet that they're not secretly trolling for offers. See section 5 for info on how to find yourself a computer. 2.6 Can I ask for help fixing item x. Yes. Be aware that it may be difficult to help you fix things if you don't have much knowledge of how computers work or of how to use basic electronics tools (VOM/DMM, soldering iron, EPROM burner, etc). I'm no whiz with this stuff and the little knowledge I have has come from asking questions and then buying books to find out what "Simple... Just check the voltage on the caps in the PS to make sure one of them isn't flaking out!" exactly means. 2.7 Where can I look before posting a dumb question? It might be a good idea to take a look at what's available in the Archive section of the ClassicCmp web site (see below). 2.8 Can I type obscenities about Microsoft in ALL CAPS!?! (Or, in general, be unreasonable with reagard to advocacy posts?) Check your anti-MS baggage at the door, please. For that matter, drop any posts that serve only to perpetuate the holy wars. 2.9 Can I post trophy lists? Some people like to read other peoples' trophy lists, some do not. There have been times when most people have been interested in these and times when many wanted to see them banned. So, they remain - appreciated or tolerated and somewhat controversial. Can't make everyone happy all the time ;) 2.10 Can I use obscene language in my posts? Yes. Although I'm sure many people would prefer you did not. A number of people have complained about this. I'm not going to outlaw swearing - now that I've informed you that it bothers people you can make your choice. [][][][][][][][][][] 3.1 How many subscribers are there? Around 210 and changing daily. 3.2 How many subscribers use machine x? Check the web site (see below). The Classic Computer Encyclopedia shows the number of machines registered by subscribers. 3.3 Is this list archived? Yes. The archives are available on the FTP site (see below) in the directory /pub/classiccmp/archive. The file name format indicates the month/year of the archive. Keep in mind that they are quite large. [][][][][][][][][][] 4.1 Does ClassicCmp have a web site? Yep. http://haliotis.bothell.washington.edu/classiccmp 4.2 How come the web site is so ugly? How come a PET is so ugly? Who cares as long as it works? 4.3 Does ClassicCmp have an FTP site? Yes. Anonymous FTP at 140.142.225.188. Look in /pub/classiccmp. There's not much there that's not available on the web site. I'm starting to load old drivers and system disks on occasion. There is an incoming directory which subscribers may use for ClassicCmp-related file transfers if needed. [][][][][][][][][][] 5.1 Where can I find classic computers? The best places seem to be thrift stores and swap meets. These are closely followed by pawn shops and mom and pop computer stores. The holy grails are electronics scrap yards - but they tend to be wary of individual pick-and-choosers. Oh yeah - garage sales! 5.2 How much is machine x worth? Precisely as much as you'll pay for it. Oh, you're selling it? Then, precisely as much as I'll pay for it. Seriously, no one prices these any more. I have an old Computer Blue Book that lists many classic computers but the prices are just ridiculous. Some machines (Apple Lisa's, old old Mini's, and unreleased prototypes) are starting down the road toward their original selling prices but it's unlikely that most will ever be worth more than the cost of their components. 5.3 Will 1000's of innocent machines be scrapped if I don't save them? Yes. This is the impetus behind every collector's tireless and selfless effort. Each machine we fail to save has it's gold parts mercilessly hacked off and sold (just like rhino horns - and look at the rhinos). The remainder is then sent to China to be made into bicycle spokes (you probably think I'm joking). Save a computer! Act now! Remind your SO of the rhino and cuter, fuzzier animals. It might work. In all seriousness - there are a large (and growing) number of so called "computer and electronics 'recyclers'" who take usable computers and recycle them into "reusable scrap". Small amounts of gold, silver, and platinum are extracted and the remainder of the material is generally just marketed to less wasteful countries. 5.4 I don't understand anything. Help! Don't worry - you're not the only one. Reading this list, old magazines, books and whatever else you can get your hands on is the first step. Once you reach a critical mass of knowledge thigs get a lot easier. ============================================================================= ============================================================================= ClassicCmp - The Classic Computers Discussion List Part 3 in the ClassicCmp FAQ Trilogy Technical FAQ (Frequently Asked Questions) v1.6.2 Last Update: 12/10/97 ----------------------------------------------------------------------------- This FAQ is written with the primary purpose of making readily available answers to the more common questions appearing on ClassicCmp. It is Maintained by Bill Whitson <bill(a)booster.u.washington.edu>du>. The infor- mation in this document has been gathered from a variety of sources but, in general, the members of ClassicCmp should be credited for all contain- ed herein. I have, of course, endeavored to be as accurate as is possible and often failed ;). This FAQ is Part 3 of the ClassicCmp FAQ Trilogy. The information presented deals with regularly asked questions which are technical in nature. If you have questions, comments, or corrections (always welcome) please contact me at the address above. A current copy of this FAQ is available on the web at http://haliotis.bothell washington.edu/classiccmp or via anonymous FTP at 140.142.225.188 in the directory /pub/classiccmp/faqs as cclpart3.faq. ----------------------------------------------------------------------------- Updates: Nothing new, cosmetic changes. ----------------------------------------------------------------------------- 1. General ------------------ 1.1 I just picked up a new machine. What should I do? 1.2 What's the best way to clean these dingy tan boxes? 2. Media -------- 2.1 What's a hard sector disk? What's a soft sector disk? 2.2 What's SS/SD, DS/DD, DS/QD, DS/HD, etc. 2.3 Can these formats be interchanged? 2.4 What disk sizes are there? 2.5 How do I take care of old media? 3. Component Failure Issues --------------------------- 3.1 Do EPROM's go bad? 3.2 How about ROM's, other chips? 3.3 How about capacitors? 3.4 Anything else? 3.5 So how do I backup all this stuff like you suggest? 4. Software ----------- 4.1 Where can I get a system disk for platform X? 4.2 What's the best way to back up my software? 5. Specific Problems/Solutions ------------------------------ 5.1 Is it possible to bypass an RF modulator to achieve composite output? ============================================================================= 1.1 I just picked up a new machine. What should I do? Don't power it up yet! All of the following should probably be done before that power switch gets flipped. Open the case - clean and visually inspect components. You're looking for traces of smoke, water, corrosion, loose screws, blown caps and resistors, cold (broken) solder joints, bent pins, etc. It may be a good idea to remove and re-seat all socketed components and connectors. If anything burned or overheated it will probably pay to replace it before powering up the unit. You can avoid a number of problems just by taking a peek inside. If you have the tools (and the machine is sufficiently rare) pull and dump backups of all EPROMs, ROMs, and PALs. If you have really cool tools (like a logic analyzer) it has been suggested that you use them to record critical information from those oh-so-hard-to-find custom chips. Specific information on how to do this is beyond the scope of a FAQ, but you probably know what you need to if you own the appropriate tools. Disconnect the power supply from the rest of the computer and start it up on a "dummy load". A six volt headlight bulb has been recommended as a convenient load. These should be available from any decent Volkswagen shop. Running the power supply without a load could result in damage to it. You may want to check the voltage output before you do this as it could be no where near the 5V average in micros. Even if you don't want to connect a load it's still probably a good idea to power it up separately from the computer for the first time. If you have a really rare beast it may be worth powering up some of the key capacitors out of circuit just to get them warmed up. Now you can power it up. Assuming it works, take a blank disk, format it, write some data to it, and read it back before using your precious software with it, as a bad disk drive could really ruin your day. 1.2 What's the best way to clean these dingy tan boxes? Cases: It seems best to start gently with such old equipment. Try soaking in a little water and dish soap and then scrubbing. This takes care of most jobs. For removing stickers try mineral oil or Goo-Gone (available at most hardware stores - in the US at least). If those don't work, acetone can be good but, if overused, can do more harm. For removing marker, almost any solvent is good (alcohol, naptha, etc) but will definitely discolor or dissolve plastic if not carefully applied. Lava soap is also good for removing marker but can smooth off textured plastic. For removing sun or tobacco discoloring a product called Purple Stuff available from auto parts stores (again, in the US at least) seems to do the job almost effortlessly. Recommended commercial products: Purple Stuff from Kragen [for discoloration] Brasso [ink/marker] (can discolor plastic) Antistatic Foam Cleaner from Electrolube [for discoloration/markings] Citra-Solv [for discoloration] (can dissolve plastic if undiluted) Cameo Copper Cleaner [ink/marker] Naptha [for stickers/goop/spooge] (very flammable) 3M GP Adhesive Remover [for stickers/goop/spooge] CRC 226 / CRC 556 [for stickers/goop/spooge] Fulcron [for discoloration] Blue Shower / BS II [for stickers/goop/spooge] Connectors: For edge connectors a plain pink eraser seems good for removing corrosion. Apparently other colors of eraser indicate a different texture - which may be damaging. Make sure to wipe the connectors with a clean cloth after erasing on them. There are a large number chemicals on the market that "magically" remove corrosion from components but as I don't know how safe they are, I'm not anxious to promote any of them. For pin style connectors a toothbrush and some softscrub or other mildly abrasive cleaner do wonders. Recommended commercial products: Electrolube contact cleaning sprays. Keyboards: I find a cycle through the dishwasher does a really nice job on keyboards. Just be sure they're completely dry before you put any power to them. If there is reason not to use a dishwasher (some key labels can come off) it is usually possible to remove each keycap and clean conventionally. [][][][][][][][][][] 2.1 What's a hard sectored disk? What's a soft sectored disk? We'll start with soft-sector since they're simpler to explain. On a soft-sector floppy disk the information that marks where a sector begins and ends is written to the disk by the computer (part of the formatting process). This means that various computers can use the same floppy disk types because the format of the disk is control- led by the operating system. Hard sector disks use a system of perforations in the media to mark the beginnings and ends of sectors. This means that computers which used hard sectored disks required the exact disk type they specified rather than a generic soft-sector floppy. A number of differently sectored disks were available - at least 10, 13, and 16 sector formats. 8 inch and 5.25 inch disks commonly used hard sectoring. 3.5 inch disks never came hard-sectored and, in fact, it would not be possible. 2.2 What's SS/SD, DS/DD, DS/QD, DS/HD, etc. These all refer to the number of useable sides on a disk and it's density (how "efficiently" the magnetic bits are pushed together). SS/SD is a Single Sided - Single Density disk, the earliest available type I believe. The storage afforded by a single density disk was very small compared to today's standards. Single Sided disks were popular because they were cheaper than DS and could be easily modified with a hole punch into double sided disks. SD was followed by Double Density which, amazingly, doubled the amount of storage space. Double Density was followed by the extremely short-lived Quad Density which doubled a DD disk. QD was short lived because High Density was right on it's heels and nearly doubled disk capacity again. DS/HD was as sophisticated as 5.25" disks became. 3.5" disks have progressed as far as DS/EHD double-sided / extra-high density. 2.3 Can these formats be interchanged? Well, that may depend on what computer you are using, but in general the following substitutions may be made: Desired Format Substitute --------------------------------------------------- Single Density Double Density Double Density none reliably Quad Density DD, HD (sometimes work, not advisable!) High Density none Other substitutions may be made, but due to physical differences in how the disks are made they are generally unreliable. It can almost be guaranteed that data written to a proper density disk of poor quality will last longer than data written to a good quality disk of the wrong density. In the case of quad density no substitution should be considered reliable. DD and HD disks both can be forced to work. One may work better than the other given the peculiarities of various drives. 2.4 What disk sizes are there? Disk Types? Physically? Standard Disks Unique/Proprietary Disks --------------------------------------------------------- 8" (Floppy) 5" (MiniFloppy) 5.25" (MiniFloppy) 3.25" (MicroFloppy) 3.5" (MicroFloppy) 3" (MicroFloppy) 2.5" 2" In addition to odd sizes - there is at least one type of disk which was physically different. "Twiggy" disks for the Apple Lisa 1 were regular 5.25" disks with the exception that they had two read/write windows. One was oriented "north" of the center hole, the other "south". 2.5 How do I take care of old media? Step one is Back It Up! After that, make sure it's kept in a clean, dry, temperature-controlled environment (I keep mine in a broken freezer). With disks it seems important to keep them standing on end rather than lying flat - the same goes for cassette tapes. I like to exercise disks and tapes at least once every six months although I have no real evidence that this has any positive effect. I have modified an old C64 floppy drive to simply spin when a disk is inserted and send large stacks of disks through it on a regular basis just to make sure they're not starting to stick up internally. An exciting and somewhat recent development is that availability of classic computer emulators that can make disk images of old media on PC's and Macs. This seems to be a very good way to backup disks since they will eventually go bad no matter how well we take care of them. The official line seems to be that floppy disks have a shelf-life of approximately 10 years. With proper care many are lasting a lot longer. [][][][][][][][][][] 3.1 Do EPROM's go bad? Definitely. They apparently are considered to reliably contain data for (on the outside edge) 15 years. This amount can be considerably reduced if, for example, the sticker over the window has dried out and fallen off. Luckily EPROMs were not used too extensively but they're out there. An EPROM writer/reader is a relatively cheap investment and an easy fix. Even if an EPROM has "forgotten" it's data it is still fine for being "re-educated". 3.2 How about ROMs and other chips? Things wear out. It's likely that even components which have not been fried by catastrophic failure will simply start to die someday. ROMs can be dumped to a file and re-written if they die. Other custom chips which are all too common in micros will be far more difficult to replace. The best advice is to stockpile these chips when you can - but someday even unused chips will probably start to turn up bad. In this case the best defense is to stockpile information in the hope of being able to modify an existing component to meet your needs. 3.3 How about capacitors? This seems to be another large concern, but rather than being an unreplaceable component a capacitor will take your unreplaceable components with it when it goes. It's a good idea to check out all the caps in a system if you haven't fired it up in a while. Caps go bad with time (even tantalum caps, apparently - although they are more reliable) and should be replaced if they are suspect. It's unlikely that it will be impossible to find a replacement capacitor as they are much more standard electronic components. 3.4 Anything else? Documentation: If there's anything which is entirely unreplaceable its the docs for uncommon equipment. Once they're gone, they're gone. I regularly pick up docs I find for equipment I don't have just because I may someday. Paper will, of course. go bad over time but it will be obvious and they will be easily duplicated. Hard Disks: ST-251s, ST-502s, MFM, RLL... old hard disks are going to go bad. Then they'll be gone. Theoretically, I suppose it's possible to crack a hard drive and replace a dead bearing, realign, relaminate, etc... but I've never heard of anyone doing these things in their base- ment. Perhaps in another 5 or 10 years many of us will be experts at this. 3.5 So, how do I back up all this stuff like you suggest? This answer will undoubtedly get longer as I learn more. The best ways seem to be to dump the particular ROM (or whatever) using the approp- riate equipment to a floppy disk (which most of this equipment allows).

On Mon, 21 Sep 1998, R. Stricklin (kjaeros) wrote: Didn't we have this thread before? OK, Intel iPSC/1 (I want my hypercube!) -- Doug

On 20 Sep 98, at 23:37, Sam Ismail wrote: Sam, I believe the DOS for my Mindset is copyright Micro$oft. ----- David Williams - Computer Packrat dlw(a)trailingedge.com http://www.trailingedge.com

Ward Donald Griffiths III <gram(a)cnct.com> wrote: OK, the HP-94. Also I have an S100 8088 box for which (to the best of my knowledge) CPM/86 was the only available OS. Not that I consider CPM/86 to be that much better than 86/DOS, QDOS, or MS-DOS. It probably isn't, although it is certainly more obscure. I don't care much for old x86 machines even if they run non-MS operating systems. The fact is that the x86 architecture is evil. I have nothing but the highest regard for the Intel engineers that somehow managed to take the disgusting 8086 and 80286 architecture and make an almost respectable 32 bit processor out if it (the 386). However, that doesn't make me like the x86 any more. My point (for what little it's worth; I've already conceded that the charter of this list explicitly covers all computers over 10 years old) was that I don't consider any computer that instead of inspiring interest makes me want to run away screaming should be considered a classic, notwithstanding its popularity. This is obviously only me own personal opinion, and I really didn't intend to start a religious war. I'm sure there are some demented people out there that actually *like* the 8086. And I'm sure that there are many people who are happy to consider even disgusting machines classics; I just happen not to be one of them. Cheers, Eric

No. And I would _seriously_ drive across the country to get any S/360 or 370. Maybe even for an S/3 or S/7. A real problem, I would say. The Model 30s were just about the runts of the family, and could only have 8 to 64 K of storage. I would think that putting Linux on an S/370 would be just a bit easier, but still cool enough to matter (circa 1974!). But I think there are less S/370s out there than S/360s (I know of _one_ S/370, and it belongs to IBM. S/360s, at least, number more than 10, probably). And by S/370, I mean _real_ S/370, with the cool panels. Not the beige boxes IBM made in late 1970s, dropping the S/370 name. William Donzelli william(a)ans.net