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IBM PC 5170 motherboard type 2 questions

romanon

romanon

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Talk is about TYPE 2 AT motherboard with 6 MHz CPU, 13.8" x 9.4", BIOS dated on 06/10/85 and 1 bank of 512 KB

So...What is wrong with this revision of IBM PC AT motherboard? Never saw it nowhere. No pictures on internet, nothing.

Its really so rare or where is the problem? Any suggestions?
 
tipc said:
Show us a photo. I know of 2 types of 5170 in a broad sense: the iinm earlier green version, and again iinm the later brown one. My current non working 5170 - but not for long ahahahaha, has a green silkscreen. I prefer that style. It's prettier.
Click to expand...

Very funny :D photo not exist...
We have only these information
5170.jpg

(jesus someone fix finally this prehistoric system of picture inserting)

So only this information is known

http://minuszerodegrees.net/5170/motherboard/5170_motherboard_revisions.htm
 
romanon said:
(jesus someone fix finally this prehistoric system of picture inserting)
Click to expand...
Like this? :)

attachment.php






capture_001_19112019_074445a.jpg
 
tipc said:
I know of 2 types of 5170 in a broad sense: the iinm earlier green version, and again iinm the later brown one.
Click to expand...
I only have seen the brown one so far so it could be possible that the green one is the wanted one. The only differences are frequencies of various used ICs and crystal. If the 808286 is a 6 MHz one, you could be the one to provide the first photo of this board!
 
I used to have 2 of these. Now I only have the 3rd. This unit was owned by Chase Bank :). These 2 really stupid kids (need it be said, I reside in New Jersey) were carrying it and a Wang 386 out to the curb. So I snagged them. They looked so dumbfounded. And when I say "kids" I mean 18-20 yoa.

I'll endeavor to remove the board and photo it. I am of the persuasion the green ones aren't necessarily rare. I may even have photos of the 2 I used to own. Believe it or not, and this is just what I was told by yhe Astrophysics Professor that sold them to me, they were housed in tje common area at MIT and were part of the Athena project, which as I understand was where X Windows was developed. The units are long gone, all I have left is a non working 5175 and a PGC card.

Here's one https://www.ebay.com/itm/IBM-6480188-XM-IBM-PC-AT-5170-512KB-System-Board-Motherboard-/183940762570
 
Last edited:
I finally got a chance to take a look at some of my ATs, and it looks like I have one Type 1, and two Type 2 systems. (One of the Type 2's might actually be a Type 3 with the label missing, I didn't look very closely at that one). I suspect the Type 2 and 3 motherboards are exactly the same, except the Type 3 has a sticker, a different BIOS, and of course the clock, CPU, etc. are all upgraded from 6MHz to 8MHz.
 
I couldn't resist checking again before leaving the house this morning (got to work late as a result, oh well) and it turns out that the three I checked are one each of Type 1, Type 2, and Type 3. But my Type 3 doesn't have the sticker I've read about.

Here are some pictures: https://imgur.com/gallery/Z8hSCS4
 
This thread is lost, no one has TYPE 2 motherboard as I can see :D
BTW its not depend on color of motherboard, I have 2 colors of type 1 and cca 3 of type 3 :p
 
The Type 2 motherboard had a short production run so unlikely to have many units around. It would take someone to realize they have one of the last 6MHz models and then take a picture.

There is a fourth PC/AT motherboard out there though even more scarce. It was the 7552 industrial version which ran the 80286 at 10 MHz but wasn't to be used with keyboard or display but only remote terminal. Truly a weird one.
 
kgober said:
I couldn't resist checking again before leaving the house this morning (got to work late as a result, oh well) and it turns out that the three I checked are one each of Type 1, Type 2, and Type 3. But my Type 3 doesn't have the sticker I've read about.
Here are some pictures: https://imgur.com/gallery/Z8hSCS4
Click to expand...
Regarding the pictured type 2 motherboard, with its 6448896/6448897 EPROM set.
Interesting that those numbers do not appear in figure 9 of the IBM document at [here].
I will add a photo of your EPROM's to minuszerodegrees.net
Thank you.
 
kgober said:
I couldn't resist checking again before leaving the house this morning (got to work late as a result, oh well) and it turns out that the three I checked are one each of Type 1, Type 2, and Type 3. But my Type 3 doesn't have the sticker I've read about.

Here are some pictures: https://imgur.com/gallery/Z8hSCS4
Click to expand...

So finally someone :D Nice, at least, we know that this board really exist. Can you please make picture of whole board ? Thanks
 
romanon said:
So finally someone :D Nice, at least, we know that this board really exist. Can you please make picture of whole board ? Thanks
Click to expand...
I took pictures, but now I'm not sure what exactly it is that I have. The case this board was in has a '339' sticker, which as far as I know means it's an 8MHz model. But it's very clearly a 6MHz system. Also, it has a "TEST 339" sticker on the back with a barcode (in addition to the 'normal' barcode sticker). Maybe this board was originally from another system and got transplanted into this case? I really don't know.

https://imgur.com/a/y1qvPRx
 
kgober said:
I took pictures, but now I'm not sure what exactly it is that I have. The case this board was in has a '339' sticker, which as far as I know means it's an 8MHz model. But it's very clearly a 6MHz system. Also, it has a "TEST 339" sticker on the back with a barcode (in addition to the 'normal' barcode sticker). Maybe this board was originally from another system and got transplanted into this case? I really don't know.
Click to expand...
Regarding the motherboard itself. I think that it is a type 2, because of the combination of what I see:

* Smaller form motherboard.
* Lack of a "FRU-6489922" sticker.
* 12 MHz crystal.
* 6 MHz CPU.
* ROM set 6448896/6448897, a set that is only one digit off the 6448894/6448895 set shown in figure 9 of [here]; 6448894/6448895 indicated as fitted to a model 239.
* Presence of a soldered-on U131 jumper block (although I was sure they were only on type 1 motherboards).

What date is in the code of the 6448896/6448897 ROM set ?

Any 1986 dated chips on the motherboard ?

Out of interest, is the 82284 chip a 82284-6 or 82284-8 ?
Out of interest, is the 82288 chip a 82288-6 or 82288-8 ?

(I used to have a type 2 motherboard many many years ago, but sold it.)
 
modem7 said:
What date is in the code of the 6448896/6448897 ROM set ?

Any 1986 dated chips on the motherboard ?

Out of interest, is the 82284 chip a 82284-6 or 82284-8 ?
Out of interest, is the 82288 chip a 82288-6 or 82288-8 ?
Click to expand...
I'm not sure if I've ever powered this system on since I acquired it. Can EPROM programmers double as ROM readers? I've been thinking about getting an EPROM programmer and the ability to dump ROMs might help prioritizing that purchase -- even with the delay of ordering it might still be faster than finding time to get this AT back in working physical condition, then locating appropriate boot floppies (which I'm certain I have) in the mountains of stuff piled up...

I wasn't 100% thorough but I didn't see any 1986 chips. Everything that I found a date code on was 84 or 85.

The 82284 and 82288 are both marked -8.
 
Yes, Device Programmers will read most things and save to a file, depending upon model. (E)EPROMs, Flash ROMs, PICs, you name it.

Considering you're only/mainly interested in ROMs and EPROMs, a secondhand Needhams EMP-10, 20, 11, etc. which interface via a parallel port are ideal, if only a DOS-based control program. For EPROM erasing, you'll find a old Psion Organiser DataPak formatter will allow you to erase 2 or 3 at a time. Much cheaper than a "real" UV eraser.

http://ps-2.kev009.com/ohlandl/Needham_EMP20/EMP-11_Programmer.html
http://ps-2.kev009.com/ohlandl/Needham_EMP20/EMP-20_Programmer.html
 
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