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View Full Version : Finally got an XT-286!



strollin
April 5th, 2010, 02:56 PM
I've been looking for an IBM 5162 XT-286 machine to add to my collection for several years. Every once in awhile one would pop up on Ebay but I would always get outbid since I wasn't willing to mortgage my house for one. Anyway, I saw one last week that was listed at a buy-it-now price of $500. Way too much for me. It wasn't being offered for auction but had a Make Offer button. I made an offer for $100 figuring it would be rejected. Instead it was accepted within 10 minutes! Of course there was the standard Ebay seller BS such as: as-is, no returns, unable to test, etc...

While I was waiting for it to arrive I started thinking that my offer was accepted too quickly so it must have major problems and I figured I was going to have to put some work in it to get it going.

It arrived today and it was packed pretty well. It's pretty clean, has a couple of stickers that need to be removed but otherwise decent looking. It made me nervous to see that the screws for the PS had all been removed and it was just loose in there, I thought the PS must have a problem. It has 640K RAM, 20M hard drive, 1.2M and 720K floppies and a mono display adapter.

Anyway, I hooked it up and tried booting. Of course i had to run setup but once I did that, everything works! Both floppies read/write and format. The C: drive was formatted but had no files on it. I went ahead and installed DOS 3.3 on it.

I haven't done a lot of testing yet but so far I happy to finally have it in my collection.

hargle
April 5th, 2010, 05:09 PM
pictures pictures pictures!

I recently picked up a 5170, 5151 monochrome monitor, keyboard and proprinter II, all in original boxes off craigslist.
I only really needed the monitor, but took the whole thing just to give it a good home. I'm pretty sure I can resell the thing in the boxes for better than I paid for it, but it's not going anywhere for awhile.

I am getting a little worried that i've turned a corner from collecting to hording, as I now have 12 machines, all 486 and below.

Raven
April 5th, 2010, 05:24 PM
I had over 60 machines and I've only been collecting for about 4 years now. I just got rid of about 30, stripped them to parts and trashed the cases. Almost all of mine were Pentiums though. I wish I had more 286 and below - I have like one 286 (broken), three 8088s (two portable, two not, none very expandable). I don't have a single 8086 I don't believe, but I honestly don't know which of my 808x machines are 8088 and which are 8086 if I did have any. >.>

Point is I lack in XTs and you two are lucky - I don't have a single IBM PC->AT machine, the oldest IBM I have is a PS/2 Model 25 that I can't get working (oh yeah, that's an 8086)..

mbbrutman
April 5th, 2010, 05:30 PM
Congrats!

The XT-286 is a weirdy. I have one in my collection, but I'm pretty sure it was assembled from mismatched parts - nothing is right about it including the case. Your offer was reasonable ...

IBM got schizophrenic about some of their machine choices ..


XT 286: Let's recycle the case from an XT and put a low end 286 in there instead and make first edition PC AT owners feel bad!
PS/2 Model 25: Let's go backwards now and release a 10 Mhz 8086 machine with an optional 20MB hard drive when everybody else is selling 80286 based systems! Oh, and it has a PC bus instead of MCA even though it is a PS/2.

glitch
April 5th, 2010, 05:59 PM
Nice grab! I've been looking for an XT-286 case for a long time...a friend from the Obsolete Computer Helpline sent me one that had been stuffed into an AT case years ago. I've got the original IBM manuals and disks for it, and it's all original XT-286 hardware, but in a huge AT case.

I was always confused by the PS/2 Model 25, especially the All-in-One for the educational market. You've got to love those proprietary hard drives. Of course, for an 8086 based machine, they /are/ fairly fast.

mikey99
April 5th, 2010, 06:29 PM
I have a working XT-286 motherboard I got awhile back and am looking for a nice
clean XT case to build my own. I have all the parts, just no case :-)

strollin
April 5th, 2010, 08:30 PM
These pics are from the Ebay auction. I haven't gotten around to taking any yet.

http://www.strollin.net/xt286_front.JPG

http://www.strollin.net/xt286_bck.JPG

http://www.strollin.net/xt286_top.JPG

http://www.strollin.net/xt286_top2.JPG

NathanAllan
April 6th, 2010, 12:13 AM
Nice grab! I've been looking for an XT-286 case for a long time...a friend from the Obsolete Computer Helpline sent me one that had been stuffed into an AT case years ago. I've got the original IBM manuals and disks for it, and it's all original XT-286 hardware, but in a huge AT case.

I was always confused by the PS/2 Model 25, especially the All-in-One for the educational market. You've got to love those proprietary hard drives. Of course, for an 8086 based machine, they /are/ fairly fast.

Obsolete Computer Helpline, I haven't heard frmo them in a while now. I wonder how Tom is doing?

Strollin, looks like you got a pretty nice score, that's a nice clean one inside and out. My 286 that I have is a weird hybrid something, with an added box on it for what I think are for terminals. Neat, but I haven't had a chance to reallly experiment with it.

Score for you!

richo132
April 6th, 2010, 05:23 AM
XT-286 PCs show up several times a year - its just a matter of patience.
I bought one off eBay last year from a US seller - can't remember price but it was fairly cheap.
Airfreight to Australia was a much bigger cost :(
My XT-286 arrived in good shape and seems to be fairly original - single 1.2Mb FDD and 20Mb HDD.
Obtaining a GTO took more patience - they do seem to be rare.
You may be interested in some info re XT-286 keyboard:
I believe one correct part# is 1390120 - but there may also be others.
Look for silver IBM logo with black text plus removable cable with AT*connector
Additional comment; 1390120 differ from 1390131 IBM keyboards in that they do*NOT have the three LEDs in upper-right position for Num Lock, Caps Lock, Scroll Lock.
Cheers.

strollin
April 6th, 2010, 05:32 AM
... You may be interested in some info re XT-286 keyboard:
I believe one correct part# is 1390120 - but there may also be others.
Look for silver IBM logo with black text plus removable cable with AT*connector
Additional comment; 1390120 differ from 1390131 IBM keyboards in that they do*NOT have the three LEDs in upper-right position for Num Lock, Caps Lock, Scroll Lock.
Cheers.
Thanks for the info but I actually have a keyboard from an XT-286, got it with the machine I bought in 1986. Somewhere along the way I sold or gave the machine away (I regret having done that) but I kept the keyboard. That keyboard has been in use daily since then and is my favorite keyboard.

richo132
April 6th, 2010, 05:40 AM
Thanks for the info but I actually have a keyboard from an XT-286, got it with the machine I bought in 1986.
What is the part no on your K/B ?

strollin
April 6th, 2010, 08:52 AM
The part # on my keyboard is 1390131.

mikey99
April 6th, 2010, 09:36 AM
Doesnt the XT286 have a battery pack in the slot on the back ?

If so watch out for those because they can leak directly onto the MB.

strollin
April 6th, 2010, 10:48 AM
I checked the battery and it looks OK, no leakage but I'm not sure it will hold a charge. I plan to get a new battery.

glitch
April 6th, 2010, 10:57 AM
I checked the battery and it looks OK, no leakage but I'm not sure it will hold a charge. I plan to get a new battery.

It should be a standard 4.5V alkaline pack, which isn't rechargeable. If it's dead, a better alternative to the proprietary and often expensive 4.5V packs is to purchase a 3-cell AAA holder and splice its leads to the original battery pack's leads. It's a lot easier to find AAA batteries than the specialized 4.5V packs. I did this for both my IBM AT and the XT-286.

mikey99
April 6th, 2010, 11:20 AM
I checked the battery and it looks OK, no leakage but I'm not sure it will hold a charge. I plan to get a new battery.

On my IBM AT I used one of those four cell AA holders with long leads, and some velcro to
attach it to the outside rear of the case. This way if the batteries ever leak they won't
get acid on the motherboard.

strollin
April 6th, 2010, 12:08 PM
I will replace with the same battery. It's a 6V Lithium, BR-P2.

http://www.strollin.net/BR-P2_battery.jpg

Raven
April 7th, 2010, 05:50 AM
XT-286 PCs show up several times a year - its just a matter of patience.
I bought one off eBay last year from a US seller - can't remember price but it was fairly cheap.
Airfreight to Australia was a much bigger cost :(
My XT-286 arrived in good shape and seems to be fairly original - single 1.2Mb FDD and 20Mb HDD.
Obtaining a GTO took more patience - they do seem to be rare.
You may be interested in some info re XT-286 keyboard:
I believe one correct part# is 1390120 - but there may also be others.
Look for silver IBM logo with black text plus removable cable with AT*connector
Additional comment; 1390120 differ from 1390131 IBM keyboards in that they do*NOT have the three LEDs in upper-right position for Num Lock, Caps Lock, Scroll Lock.
Cheers.

I have a Model M that has all of those characteristics. I assume that that's too new to be an XT-286 keyboard, though?

digger
April 7th, 2010, 02:10 PM
Heh. I remember, back when I was a kid, having a persistent (though always friendly) ongoing argument with my cousin's best friend ever since he had told me that his mom had an XT286. I kept telling him there was no such beast. If it's got an 80286 processor, then it's an AT, pure and simple. Or so I was convinced. He disagreed.

It wasn't until recently, when some Googling revealed to me that an 80286 CPU alone does not an AT make, and that there were indeed XT286 machines (albeit never from IBM, I think?). I stand corrected.

Oh well, I can't always be right. :cool:

vwestlife
April 7th, 2010, 04:43 PM
One question that comes to my mind is, was the IBM XT-286 the world's first "Baby AT" system, or did aftermarket manufacturers already come up with a 286 motherboard designed to fit into an XT-type case?

Maverick1978
April 7th, 2010, 05:25 PM
Honestly, I never knew that there was an XT-286 until I read this forum. With that said.. I checked out my area's Craigslist this afternoon on a whim. Found an IBM XT-286 with an IBM Hercules Monochrome monitor, and an IBM clicky keyboard for $100 and less than an hour away. Spoke to the owner this evening. He's the sole owner of it, and upgraded the RAM on it in the early 1990's as he used it to work from home. While he doesn't remember the specs on the machine, he did say that it has no expansion cards, and while the machine has been in storage for the last 3 years, the hard drive was removed from the machine and kept in his office. It'll be interesting to see what kind of shape it's in; I'll be going to see it later this week.

Crossing my fingers that it works and that the battery hasn't leaked all over the place - then again, if it doesn't work and is damaged, it might be free - and fixable :) We'll see!

strollin
April 7th, 2010, 06:38 PM
One question that comes to my mind is, was the IBM XT-286 the world's first "Baby AT" system, or did aftermarket manufacturers already come up with a 286 motherboard designed to fit into an XT-type case?
I honestly don't know if the XT-286 was the first baby AT but I do remember that when the XT-286 came out, it was crucified by the reviewers because it couldn't accept full height AT cards. Within a short time pretty much all full height AT cards had disappeared from the market and everyone was producing baby ATs.

strollin
April 7th, 2010, 06:56 PM
What is interesting about the XT-286 is that it runs at 6Mhz with 0 (zero) wait states for memory access while the AT has something like 1 or 2 wait states. This puts the performance of the XT-286 right between the 6Mhz and 8Mhz ATs. When I had my 5162 back in 1986, I changed out the 12Mhz crystal on mine to 18Mhz so I ended up with a 9Mhz machine which was faster than the 8Mhz AT for both a faster clock and faster memory access. IBM didn't want you to be able to do that so they had put some kind of speed check in the BIOS so the machine wouldn't boot if it was running faster than 6Mhz. I found a BIOS patch that jumped over the check, had to pull the BIOS, read contents to a file, edit the binary file to apply the patch then burn new BIOS with an EPROM burner. At the time, it was about as fast a 286 as you could get. Of course the clone mfrs came out with faster machines, I'm not sure what the fastest 286 clock speed ever was.

k2x4b524[
April 7th, 2010, 08:20 PM
Harris 80C286-25mhz chip

aitotat
April 7th, 2010, 10:28 PM
Why is the IBM 5162 considered as an XT? Since it has 16-bit ISA slots, it must have two interrupt and two DMA controllers. I would consider it an AT if it also has RTC and keyboard controller on the motherboard. Does the 5162 support AT BIOS functions or only XT functions?

strollin
April 8th, 2010, 12:27 AM
I believe it was basically an AT motherboard designed to be shoehorned into an XT case. It had 16-bit slots, RTC and keyboard controller. The setup utility that came with the 5162 supported both the 5170 AT and the 5162 XT-286 for setting the CMOS options. It certainly had more in common with the AT than the XT.

modem7
April 8th, 2010, 01:48 AM
From Scott Mueller's 'Upgrading and Repairing PCs' book,
"IBM introduced a new AT type of system disguised under the premise that it was IBM's fastest, most powerful PC XT."
"This model may look like an XT, but under the skin, it's all AT."

vwestlife
April 8th, 2010, 04:35 PM
IBM played the name-game tricks before, with the 5155 Portable PC. Despite the name, it was actually a Portable XT, minus the hard drive, and not based on the 5-slot 5150 PC motherboard, as many people were led to believe. I guess in IBM's thinking, they could not call it a Portable XT since it lacked a hard drive, although later (after the 5155 had already been cancelled) I believe they did offer floppy-only versions of the XT.

mikey99
April 8th, 2010, 07:20 PM
Which floppy controller does your XT-286 use ?

From the pictures looks like its a floppy/hard drive combined card.

strollin
April 9th, 2010, 08:06 AM
Mine has a 16-bit combo floppy/hard controller.

mikey99
April 9th, 2010, 09:10 AM
Mine has a 16-bit combo floppy/hard controller.

I wonder if thats the original controller that came with the XT286. Yours has a 3.5 drive
so I think the original controller may not work for that 3.5 drive. Can you see any model
number on the card ? Maybe thats a Western Digital card.

strollin
April 9th, 2010, 11:08 AM
On the back of the card, "IBM 68X3815" and "WDC 60-000110-04 REV X4". I think it's the original controller and was made for IBM by Western Digital. My 3.5" drive is 720k, the controller may not have supported 1.44M though I'm not sure about that.

mikey99
April 9th, 2010, 02:19 PM
The following site has many pictures of the XT-286. I think you could almost call this a 5162 'autopsy'

http://www.nadbor.pwr.wroc.pl/yesterpc/Hardware/IBM%205162/item.htm

modem7
April 9th, 2010, 04:11 PM
On the back of the card, "IBM 68X3815" and "WDC 60-000110-04 REV X4". I think it's the original controller and was made for IBM by Western Digital. My 3.5" drive is 720k, the controller may not have supported 1.44M though I'm not sure about that.
That controller is the same as the one supplied in the later 5170's.

It will handle 1.44 MB drives, and I'm sure that the 5162 BIOS supports 1.44 MB drives as well, because:
1. The (one and only one) BIOS for the 5162 is dated 04/21/86;
2. In 1985, IBM included 1.44 MB support in the BIOS for the 5170.

strollin
April 10th, 2010, 12:22 PM
XT-286 PCs show up several times a year - its just a matter of patience.
I bought one off eBay last year from a US seller - can't remember price but it was fairly cheap.
Airfreight to Australia was a much bigger cost :(
My XT-286 arrived in good shape and seems to be fairly original - single 1.2Mb FDD and 20Mb HDD.
Obtaining a GTO took more patience - they do seem to be rare.
You may be interested in some info re XT-286 keyboard:
I believe one correct part# is 1390120 - but there may also be others.
Look for silver IBM logo with black text plus removable cable with AT*connector
Additional comment; 1390120 differ from 1390131 IBM keyboards in that they do*NOT have the three LEDs in upper-right position for Num Lock, Caps Lock, Scroll Lock.
Cheers.
I dug thru some keyboards I have out in my barn and found one of the 1390120 keyboards.