Where else am I posting?

Adafruit has created a fabulous place, Adafruit Playground, where makers may post their builds with no ads. So I have been publishing more there at the moment. You can read those posts at https://adafruit-playground.com/u/AnneBarela.

30 Years Ago: Becoming Cancer Free

I don't write much about cancer these days. Between 1995 and 2005 I did extensively. As this is an anniversary, one that I may have not gotten to, I am writing down a bit of the journey I went on back then.

I was in the US Diplomatic Corps, the US Foreign Service, back in the 1990s, as a Security Engineering Officer.  It was a niche job for an Electrical Engineer, but we were traveling the world. In the early 90s, we lived in New Delhi with our infant daughter. In 1993 I was getting hip pain and was prescribed ibuprofen. Then I was transferred to Sofia, Bulgaria. I started feeling worse, aches, chills, numbing of my extremities. And the itching started. The medical staff flew me to London for tests. Lots of tests for tropical disease were negative. But a chest x-ray led to finding out I had Hodgkin's Lymphoma, a cancer of the imune system. I flew back to Bulgaria, we packed suitcases and flew back to Washington.

In DC, I was diagnosed with stage 4BE Hodgkin's, the most advanced. It was throughout my lymphatic system, my lung, and in my bone marrow. I was given a 45% chance of survival. I started on a fairly new chemotherapy, ABVD, along with Neupogen to stimulate my white blood cell production and the new Zofran antinausea medicine ($20 a pill). Treatments were torture and days after I was very bad off. I still was working as my doctor said I might need a bone marrow transplant afterwards. All during this my second daughter was born. I wanted to live to see my daughters grow up.

About 30 years ago, in the Fall of 1994, I was declared in remission. There was no sign of the cancer. I still had a high chance of relapse so there was no time to celebrate. Many visits and tests to see if it had returned. Those checks became less frequent. At 5 years, I asked if I could declare victory. "No, maybe 10 years." Then at 10 years, it was "Visit if you feel ill." I have never really been able to celebrate beating it. The process was hard for my family. It was very hard for me. And the uncertainty of relapse was always haunting me.

My daughters have grown into accomplished women. I retired from the Foreign Service in 2018 after 30 years of service. I'm in Florida now and happy. And I'm celebrating 30 years being cancer free. I deserve that much.

Restoring an IBM PS/2 Model 55SX

 

Tackling this IBM PS/2 Model 55SX next. Learning about reviving Microchannel Architecture machines.

Vintage HP Disc Memory Division T-Shirt 1983

 

I worked for the HP Disc Memory Division in Boise Idaho, during the summers of 1981, '82, and '83. It gave me the money to almost afford to go to Whitman College prior to attending Caltech the following two years under a 3-2 Engineering Program.

In 1981, I worked with a microscope 8 hours a day soldering wires on disc heads. In '82 & '83, I worked on the HP 7933/7935 disc drive (Wikipedia) assembly line. I did multiple jobs, wherever they needed me: installing blower motors, making the assembly the disc packs went in ("the tub"). The units were the size of a small dishwasher. And they were finicky to make. They had 7 platters, 14 heads, so a lot could go wrong. When they failed burn-in testing, they'd be sent back to change out a possible defective part. It kept us very busy! 

I think the shirt above is my only one to survive to this day. It has the HP logo on the front. On back it has a person holding up a barbell with words depicting issues encountered. The text says "B.F.D. does it under pressure". BFD referred to the unofficial name HP gave the HP7933/35 units: "Big F'in Drive". At 404MB, it was much larger than previous units (the HP7920 had 50MB).

If anyone is interested in this piece of Hewlett-Packard history, contact me on Twitter @anne_engineer or Mastodon @anneb@octodon.social. 

IBM 5170 PC/AT Upgrades

 

For the last few days, I set aside the IBM 5160 PC/XT and put the 5170 PC/AT back onto the bench. I got another AST Advantage! card with 2MB on it. I also got the IBM Model M with silver badge and status indicator LEDs as a permanent match to this PC.

I added one row of 256 megabit chips from another AST card to the newly acquired one and put it in. It has the daughtercard in the picture above. The remaining Advantage card has 256K on it and it's bolstering the machine at present but hogging a 16 bit slot.

I moved some cards around. The IDE hard drive controller is at the far left with a CompactFlash card with lots of software on it. I tried to use a new bracket mounted CF card holder but it didn't want to play. I swapped the modern produced 8-bit Ethernet card for a vintage 3COM 509B 16-bit model I found in my storage unit. With that, only one 8-bit slot remains. I found a Vortex2 2500 card in storage too, and that might replace the least-used memory expansion card.

Networking isn't working yet, I'll look to do that later when I get a wired network up and running (I have plans there).

With things sorted well to this point, I'll button it up again and resume with the IBM PC/XT.

Buying an Old IBM PC or Compatible on eBay or in Person - tips

Buying old computers is always a bit of a gamble, as is buying used items made so long ago. As long as you go into buying mode with the expectation that things may go well or not so well, you'll be best prepared for the results.

So you browse eBay or Craigslist, or go to a boot sale or Ham swap meet. There is an old IBM or compatible computer you're interested in. Here are some tips that may help you in the buying evaluation process.

1. Is it running? - Likely "no way to test" as few rarely have all the parts, period correct display, etc. Here is a list of running conditions:

• No power applied
• Powered up, fan spins on power supply
• Computer beeps on power up
• Hard disk and/or floppy sounds
• Some display says it "boots" to BASIC
• Some display says it shows errors or boots MS or PC-DOS

Each level down is better than the last. If there is a hard disk and it boots to DOS, that's best. Boots from floppy second, and so on. This gives you confidence in the motherboard, power supply, disk controllers, etc. More confidence in working hardware = more valuable (to you - always keep this info to yourself).

2. Exterior Visual Inspection - Why is this #2? Because #1 provides more information at first inspection.

Look at the pictures, or if you're lucky in person. Case condition counts - are there screws holding things, items loose, accessories if any.

Important: Look at the rear panel. See what add-in cards you can see from the outside. It's a really good indicator of what comes with the machine. And sellers most often have no clue and don't price up with "good cards" inside, full memory, or a coprocessor. This is the first IBM PC/AT I bought. The price was good and I was intrigued at the cards:

The left connectors look like a standard 9-pin serial and parallel port. The far right looks like a display card with parallel port. The second from the left is a 10-Base T network card and the third card could be a display but that would make two. So definitely more than bare bones here. That with two floppy drives had me intrigued. 

If you have few ports, that may be a sign the machine is a bit less desirable - the best thing is to get an...

3. Interior Inspection - this isn't always possible, try to see inside if at all possible. Many auction listings have interior pictures. 

Here you can see a lot of good info: It's a later model AT from the 512K System board. It has a Seagate ST-225 hard drive, half height, no 80287 coprocessor and lots more interesting card info. The most valuable cards are memory. The cards are, from the left, the floppy/hard drive controller, standard, IBM serial/parallel adapter, common, an IBM 128k memory board (brings memory to 640K, good!) the 10-Base T network card, an IBM Token Ring network adapter, and the far card was a dual board strange beast, which turned out to be a Wyse 700 display card, pricey in the day. 

Wow, this is better than average. The extra memory is the main bonus. Unfortunately the card doesn't hold more than 128k. The network cards are not immediately useful and the rare display card not immediately useful either (but commands $90 to $150 on eBay).

So the inspection lets you know how much bang for the buck you get. Add this to the info in previous steps.

NOTE: Unless it boots with hard drive access via a display, never assume the hard drive works. Most often they have died due to age or transit. The red light might come on, it doesn't count really. This is not a huge deal breaker as there are solutions to use memory cards holding much more instead. But a working hard drive is excellent, one with application software more so. Floppies can also not be working with dirty and/or misaligned heads. This is all about 40 year old hardware.

4. Cleanliness - if it's cleaner than not, that's great. Also if it doesn't smell like cigarette smoke or says "smoke free environment" that's good too. I had one machine that had an old insect infestation, yuck.

Ready to Decide

Ok, based on the information you have, you then need to decide if you want it. You don't want to show much emotion to the seller. Of there is a process to offer a price, you can start lower than their price. Then again, if you see lots you like, you might just want to pay their price, if reasonable. 

Know that you'll need a keyboard, display, cabling often to be able to check it out, those all cost extra, usually from other buyers. Factor that into your budget. I usually look to buy a used VGA card and hook it to a more modern LCD display with VGA connection. Keyboards can be very expensive especially for genuine IBM, but some knock-offs can be reasonable. On this machine, I got the seller to throw one in for free.

Then you use the methods for haggling and buying familiar to most people. Don't like it, don't buy it. If you find some utility, look to pay what is useful to you, which may be less than they want. If they want too much, there are likely others out there. If you see something rare about the machine, factor that into your price.

Usually there is enough stock on the market to have a pick. At the time this is being written, a drought on IBM PC/AT machines appears over and they are selling for around $300 US just the system unit. But not all machines are the same, hence the review. Also price rises depending on #1 - if it's running. Don't expect a $300 machine that boots to DOS 6.22 with a ton of software and memory. If you can find one, it's a true bargain.

Shipping

Buying in person saves money. Unfortunately these computers are heavy and shipping can be costly. If an auction says shipping free (or at a low cost), factor that as a positive. If shipping is too much, you might want to pass. And likely if the hard drives with my two PC/ATs ever worked, the harsh shipping that likely ensued trashed them. 

The buyer could park the drive heads or pack the drive in a secure box but that would be very rare and command more money as most will not do such.

Good Luck

The chance can be fun and can be frustrated. I ended up getting a second AT that had some different features than the first and the parts complement each other - like a 1.44MB floppy, an extended memory card with 128K and room for more, a coprocessor, a clock/port card. So I could use all the best parts for my build. But the hard drives in both machines failed, different reasons. And the floppies had some issues.

I hope you find some satisfaction in the hunt and digging into your finds.

From minuszero.net - some tips on language used on auction sites:

"Extremely rare"

Example:  I would list one of my toenail clippings as extremely rare, because only my clippings contain my DNA.

"Includes a certificate of authenticity"

Useful for proving the authenticity of an item that you are selling.
For example, I provide a Certificate of Authenticity with every "Genuine Loch Ness Monster's Tooth" that I sell.

"Pulled from a working system"

working  =  I turned the system on, and I either heard the power supply fan turning, or I saw a light somewhere turn on.  No smoke was evident.

"It was working the last time I powered it on"

Meaning #1:	It does not work now.  I will say that it it worked the last time I powered it on.  When the buyer complains, I will say that it was working 5 years ago, and must have deteriorated in that time.
Meaning #2:	I have no idea how to tell if it is working or not.  But, I think there's a good chance that it is working.  I do not want to list it as untested because that will put a lot of people off.  I will list it as, "It was working the last time I powered it on", and take my chances.

Upgrading the IBM PC/AT to MS-DOS 6.22 and Windows 3.1

 You read this correctly. What a software upgrade. My floppies for Windows/286 seem damaged. so...

Going from MS-DOS 5 to MS-DOS 6.22

Once I got the 1.44M floppy recognized, the 1.44MB MS-DOS 6.22 upgrade diskettes read correctly and the install process ran fine. DOS 6.22 takes up more memory but has some nice utilities and is the most state of the art version (to my knowledge).

It's a matter of feeding three floppies to upgrade. It's kinda touchy - it really wants things just right to upgrade the DOS and you cannot use the upgrade floppies for a new install (unless there is a trick I'm unaware of). It saves the old MS-DOS in a hard disk directory folder called OLD_DOS.1 in case you need things or decide to uninstall. Speaking of uninstall, all the MS-DOS upgrades want "Uninstall Floppies", usually one or maybe two to undo the upgrade. Just a PITA in my book.

Looking in my floppy collection, I found Windows/286. But the disks appear to be damaged.

I was wondering what to do so...

Installing Windows 3.1 on an IBM PC/AT

I have install 1.44MB 3.5" floppies for Windows 3.1 and Windows for Workgroups 3.11. If I remember correctly WfW wants an 80386. So I grabbed the Windows 3.1 diskettes. It talked about a mouse - lucky I got that ATI VGA Ultra card with in-port mouse built in. My 1080 VGA/DVI monitor did not like 640x400 mode so I borrowed the VGA LCD monitor from the Gateway Pentium III machine.

6 diskettes (119 files) later, I get the Windows 3.1 splash screen. 

The display is canted to the right. I want to adjust the screen resolution, if possible but I need to Google for that, my memory is not so clear on that and drivers doesn't seem to do display drivers to my knowledge.