A real PC

November 15, 2010

IBM 5150 with video monitor

I’ve been restoring a 5150 model A. It has the second BIOS, Intel CPU, and a full 64KB on the planar. After having put the bits together and cleaned it all up I think I’m through with the hardware and can put in the two case screws. However, I’m still looking for some cork feet since the originals seem to have gotten scraped off. I’m also looking for another 16K memory chip, to replace the one I stole off another board so that I could get this one to work. There’s always some peripheral fallout to every project.

For those not familiar with the 5150, it is the original IBM PC which came out in August of 1981. Until then IBM did not make small, or affordable, machines. That is unless you count the 55 pound portable 5100. That one cost $9000 for the 16KB model and $20000 for the 64KB version. Regardless of the price, it was made for the scientific community and was not really suitable for an office, and certainly not for home use.

The 5150 was a completely new design. It was aimed at the emerging popular market. The included operating system was PC-DOS v.1.0, and thus was started a whole new world of computers. Yes, there were others on the market at the time, IBM isn’t known for being leading edge, but this one became the reference point. In fact it is really the starting point for the ubiquitous world of PC compatible computers.

There were two distinct versions of the IBM PC. The first one (which is what I’m talking about here) had 16KB on the motherboard and was expandable to 64KB. The second one had 64KB minimum, and was expandable to 256KB. I think there were also some minor variations along the way. Certainly there were three BIOS versions and machines were put together to suit the costumer.

There is much to know about these models and the DOSes that came with them. Suffice to say that DOS 1.0 was not very good, and gave way to a much better 1.1 in May of ’82. The next step was DOS 2.0 which was a complete rewrite and works like the DOS we know today. That was released March 1983 at the same time as the newer, and much more functional, IBM 5160 – also known as the XT.

I’m fairly comfortable with early DOS and the associated hardware, but the 5150 represents the formative period and I’ve learnt a lot of history from doing this. The first couple of years is when the stardards were set. That is one reason I’ve enjoyed this project so much. So, in order to avoid what I call “vintage creep” I’ve decided to freeze this machine at late 1983.

Rather than try for a machine that is “new in box” factory perfect, or a super-duper “loaded” setup that no one could have afforded back then, I’ve taken the approach of setting up something that a not so well off, but dedicated, computerist might have had. Something which is historically entirely possible but not what the average vintage buff collects. In order to do that I made up a story. Here it is:

Mr. Brown originally purchased an IBM PC in the spring of 1982 because he wanted to get stock market reports directly to his office. Although he didn’t go all out, he couldn’t resist taking advantage of, what was described as, the IBM’s “powerful color graphics”. The system included:

1 double sided floppy drive
Colour graphics adapter
64KB installed RAM
Asynchronous Communications Adapter
PC DOS v.1.1
Colour CRT display monitor
External modem

Soon finding the system limiting without either a printer or a second drive, Mr. Brown decided to sell it the next year when the IBM XT came out. However, he decided to keep the expensive colour monitor and the external modem.

Tom Mulligan was a willing buyer. He had a keen interest in the new bulletin board systems and jumped at the chance to buy a used IBM. He also decided to splurge on a fancy 1200 baud Hayes Smartmodem. He had had his eye on the flashy aluminum external version, but when offered a deal on the internal, decided that it was just as good, and besides, the now extra serial port could perhaps be used for a daisy wheel printer some time in the future. He also upgraded the system to 256KB RAM with an IBM memory expansion option that had 192KB installed. Of course he also purchased a copy of the newly released PC DOS v.2.0.

Having now spent almost a grand in addition to the computer, an IBM color display was just too expensive, so he decided to go with a cheap video monitor which he could use with the Color Graphics Adapter. He also wished he could afford a second floppy drive, but decided to wait.

It is now 2010 and that computer is mine. I’ve put it back to the state it was in when it was Tom’s and it now has all original IBM cards and the 1983 Hayes modem. I will display the computer with PC DOS v2.0 and try to make the best of that. My intention is to have an historical experience, not just a mythical “best of 8 bit” using software from 10 years after the machine was first announced. This is my idea of vintage. I want to relive Tom’s experience.

I’ve been collecting DOS software from 1981-83 and now I’m in the process of putting together a small selection of disks for various purposes. The 1983 “Exploring The IBM Personal Computer” disk is hilarious, but so is the PC DOS v1.1 with it’s BASIC programs. However, since I’ve found some excellent communications software and have plenty of room to spare on a bootable DOS 2.0 360K floppy, I can actually use this machine for BBS dialins, though only occasionally because none are local and there aren’t many of them. However, it does make for a bit of fun and an excellent demonstration.

PC DOS 2.0 video test screen

The video monitor is a bit unusual but it is from 1983. It is an Arrow 12 model DM-210G. It has both video in and out, so one can easily attach more monitors. It also has the added sophistication of having both a 75 ohm and high impedance input. The above picture shows the IBM PC DOS version 2.0 test screen. It’s actually pretty linear. The apparent problem on the right is just that it goes off the screen a bit. I can adjust it so it goes off on the left but decided to leave it this way until I can figure out which parts to adjust or replace since there is no internal pot for that.

Arrow 12 logoArrow 12 input

The inside of the machine is noteworthy as well. I’ll elaborate, and put up some pictures of the cards in my next post.

Catchup and Computer Spice

November 15, 2010

I notice that there are more people who don’t use a computer than do. Of course the devil is in the word “use”. There’s lots of computers around and more people drive cars with at least one CPU than don’t. Although one of my neighbours drives a ’48 GMC pickup. He’s old, like me, and likes old technology. To bring the vehicle up to date he installed his own positive crank case ventilation. Like many other old people, he embraces technology – and yes he has a number of computers on his desk and knows how to use them. A lot of people don’t take that approach nowadays.

That is the way the world is going. There are more and more computers around, and less and less people who are aware of what they are. They take advantage of them but don’t really “use” them. There are lots of devices on the market which are really computers. The trouble is, those devices are just doing their own thing. The user is doing something else. They are not in control of the machine. It’s not really theirs.

OK, with that little rant out of the way:

It is nice to see that some people do know what a computer is. Last year we saw an old PC with 64KB of RAM go for $4000 on eBay, and this year we saw a Kenbak (with 256 BYTES of memory!) go for $25000. Most people would throw something like that away, but obviously someone could appreciate the spice that an old computer can offer.

I’ve just been restoring an IBM PC for which I paid $40. Price wise, that’s more my speed, but I’m going to get my money’s worth. It has already added a lot of spice to my computing life. With only a single floppy running DOS 2.0 and a 1983 version (the first one) of Kermit, it will connect nicely to a BBS through a Hayes internal which is also from 1983. I’ll put up another story with a picture or two.

Now that I’m back to this blog, I apologize to jas for not responding to what I thought were really odd comments, but I’ll get to that. His board can be found here: http://eob-bbs.com/ To me, anybody who puts up a bulletin board deserves a boost.

Also, apologies to greg urbano whose comment sat for a long time in limbo waiting for approval. He wrote: “my friend is writing a blog on the old bbs still running, you can check it here – http://bbsing.wordpress.com/

Back shortly . . .

Newcomers Welcome

February 22, 2010

Try calling a bulletin board – here’s how.

I feel like my BBS series should include information on how to access a BBS. Much of what I have written so far is aimed at people who do know how, but who I am trying to encourage to do so. That is, people who used to do it, but have forgotten or didn’t realize that the scene was still alive. There are many people who have vintage computers who are not using bulletin boards and whom I would encourage to add BBSing to their vintage experience.

Still, somebody who doesn’t know how to connect to a BBS might come along, so I will give some basic information with a few links for the details. If you’ve never done it, it’s easy.
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More Bulletin Boards

February 5, 2010

An even dozen from around the world. (updated)

I have continued my exploration of the BBS community and have more to report. Not all these boards are really great and not all are completely functional. This is because many boards seem to get old and disused after a while. However new ones come on the scene and old ones revive.

In prervious posts I have given links to lists of boards. These are useful, but the number of dead ends can make their use difficult. One organization which has a solution to that problem is bbs-scene.org. They maintain a list which is checked daily to make sure the boards are up and running. That, of course, doesn’t mean that they all work, but it’s a good start.

The bbs-scene.org does much more. In their own words:

“bbs-scene.org offers a collection of internet services to the bbs (bulletin board system) community. We offer an irc network and a nntp (or news) server.”

I am sure their efforts will help give more life to the community. Hopefully too, that will make it more attractive to newcomers.

I found another list which is up to date. I’ll let them explain:

BBSfinder is based off of the concept used at SHOUTcast.com. A dynamically updating list of of radio stations (in BBS finders case, Bulletin Board Systems) that is never out of date. The idea was sparked due to two main factors… The Bulletin Board Scene has dwindled since it’s glory days in the 80’s and 90’s. While there are many BBS’s active, the caller numbers have lowered. This is a site to help raise awareness that BBS’s are still alive and kicking.”

You can find them at http://www.bbsfinder.com/

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Finding A Board

January 19, 2010

I have been looking for interesting bulletin boards. My experience has been a mixture of pleasant surprise and downright disappointment. The following text details my adventure. I have put the most successful experiences at the end.

As you can see from my first story on this subject, there are lists. It is a huge job to go through all the possibilities, so I tried to find ones that had some draw to me. I am not a gamer, so the ones that advertised that as top priority were not tried. There were a couple of exceptions to that because they looked particularly good for some other reason. My journey then, is partially random. It is interesting that eventually I did end up finding some of the most active and, in some way, important ones. Realize though, that there are very many more out there and I am sure there are some very good ones that I have missed.
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The BBS Lives!

January 11, 2010

Most people over 25 will remember fondly the days of the BBS. Here in North America, they were accessible to anyone with a phone line. Unlike the internet, you didn’t need to pay, and the software was simple and readily available. Basically, if you were old enough to type in a phone number, you were on.

In my area there were maybe 300 BBSs, so there was a lot to choose from. All major cities could boast the same – or more. However, by ’99 those numbers were way down. At this point in time, there are probably only about 50 BBSs in all of North America which are accessible via the phone line. The internet is just so accessible to everyone, that survival of the BBS became quickly endangered. Except for one thing – fanatics!
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BBS Lists – Still There

January 11, 2010

To know what BBSs were available in my area, I used to rely on a list which was published and updated frequently. It was known as Roxanne Spear’s BBS List. A work of love such as is seldom seen – but where is it now?

I actually have an old copy or two sitting in my archives. But the world has changed and almost all of those bulletin boards are gone now – almost, but not all.
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