IBM Personal System 2 8550 50Z Processor upgrade

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ThinkPad560X
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IBM Personal System 2 8550 50Z Processor upgrade

#1 Post by ThinkPad560X » Wed Apr 05, 2017 12:58 am

I have a nice condition almost looks new IBM Personal System 2 8550 50Z and the white casing is still white and not yellowing. It didn't come with a HDD when I bought it way back and bought the largest that it would handle, a 120MB ESDI HDD.

I wanted to install Windows 95 at the highest on this machine but the floppy boots and says "This version of Windows requires a 386 processor" This desktop is a 286 Processor. I even tried Windows 3.1 floppies and just boots to a blinking post. So no OS on the machine. Is their a way to upgrade the processor chip to a 386 or even a 486?
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#2 Post by axur-delmeria » Wed Apr 05, 2017 1:33 am

I found this page: http://john.ccac.rwth-aachen.de:8000/alf/ps2_50z/

There's a picture of an IBM SLC/50 upgrade board here:

Image

But it necessitates modification, as this part mentions:
This machine doesn't have the original 286 CPU. I upgraded it with an SLC/50 CPU module made by Kingston that gives a nice performance boost and allows to run 32-bit software. Originally, this module was made for 286 machines with a PGA socket for the CPU. IBM however switched to the cheaper PLCC case with the 50Z, so I had to unsolder the CPU socket and replace it with a PGA type. One could still put the 286 back in place because it is possible to put a PLCC socket on top of a PGA socket. The module itself offers a slot for a 387SX coprocessor; you cannot keep a 287 coprocessor when upgrading. That's not as bad as it sounds since a FP emulation on a 50MHz CPU is almost as fast as an old 287.
Daily driver: X220 4291-P79 i5-2520M

In reserve: X61 T7500, X60 T2300
In pieces: X60s CS U1300 [board only], two retired but working X61Ts
RIP: 760XD 9546-U9E

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#3 Post by ThinkPad560X » Wed Apr 05, 2017 2:00 am

I found some of these boards and even a brand new Kingston upgrade kit for IBM Model 50Z for $99
http://www.ebay.com/itm/KINGSTON-SX-20- ... SwWxNYwH8X

and a few more of these boards but they are out of my price range of upgrading this computer for its age.
They are too much money.

http://www.ebay.com/itm/KINGSTON-KTM-SX ... Swd0BV03RY
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#4 Post by ThinkPad560X » Wed Apr 05, 2017 2:16 am

I don't know if the processor has pins on it or not, but the 386 processors them selves are cheap.

Here is what it has. "bottom page"

http://patcomps.weebly.com/

I'm guessing the 10 at the end means it has a 10Mhz processor.

The Processor chart. The socket has a PLC and the 386 has a PGA
(Copy Paste entire link)

http://www.cpu-world.com/Compare/964/In ... 6-16).html
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#5 Post by axur-delmeria » Wed Apr 05, 2017 3:27 am

You cannot plug in a 386DX processor into a 286 board. Besides the socket difference, the 386DX uses a 32-bit data bus, while the 286 is 16-bit only.

The 386SX works because it has a 16-bit bus like the 286, but the two are not pin-compatible so upgrade boards like the Kingston ones are needed.

The IBM SLC/50 works because it's also derived from the 386SX, albeit with a built-in 8KB L1 cache.
Daily driver: X220 4291-P79 i5-2520M

In reserve: X61 T7500, X60 T2300
In pieces: X60s CS U1300 [board only], two retired but working X61Ts
RIP: 760XD 9546-U9E

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#6 Post by ThinkPad560X » Thu Apr 06, 2017 12:26 am

After reading on that link you'll have to solder a PLCC socket onto it where the PGA socket is.
I was going to buy the new $99 board. I noticed that the board had pins under it and looked at a 286 online to see how mine looks without removing it since I don't have the removal tool.

The PGA socket is different. http://www.ebay.com/itm/INTEL-N80286-10 ... Sw~otWeidV

I thought it was going to be a plug n play removal of the 286 Processor and install the adapter board.
I don't think it would be worth the money and I really don't solder and my eyes are bad anymore, if anything motherboard wise I still install memory "RAM" or CPU swap upgrades.

So the next move for the computer is how can I install Windows 3.1? I put in disk 1 and it just boots to a beeping prompt
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#7 Post by axur-delmeria » Thu Apr 06, 2017 5:32 am

A deeper search leads to this: http://www.walshcomptech.com/ps2/kingston.htm#sxlcmd, which is apparently a Kingston 386SX upgrade module designed specifically for the 50Z, so no modding required.
Daily driver: X220 4291-P79 i5-2520M

In reserve: X61 T7500, X60 T2300
In pieces: X60s CS U1300 [board only], two retired but working X61Ts
RIP: 760XD 9546-U9E

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#8 Post by ThinkPad560X » Thu Apr 06, 2017 12:36 pm

So these will not fit mine as I have a SXxxLCMD Model. The SXNow LEM model is used on the 25-286 and 30-286 systems. It is designed exclusively for those systems, and will not fit correctly in the 50Z

http://www.ebay.com/itm/KINGSTON-SX-20- ... SwWxNYwH8X

http://www.ebay.com/itm/KINGSTON-KTM-SX ... Swd0BV03RY

These are the only ones I could find on ebay.
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#9 Post by ThinkPad560X » Thu Apr 06, 2017 1:12 pm

I bought the $99 brand new item. The seller said it should work and fit.
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#10 Post by micrex22 » Fri Apr 07, 2017 11:37 am

ThinkPad560X wrote:I bought the $99 brand new item. The seller said it should work and fit.
It should if it's explicitly designed for the 50Z.

I have a 286-to-486 adapter running on my PS/2 30-286 motherboard.

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#11 Post by ThinkPad560X » Fri Apr 07, 2017 11:40 pm

It says for IBM 50Z models on the Kingston card.

I went and got a White IBM 15" LCD monitor to fit well with the IBM 8550 50Z desktop. It will also fit well with my IBM Aptiva and IBM Personal Computer 300GL. I already have 2 IBM CRT monitors. 1 basic tube and 1 true flat tube. Another would be a lot of room to take up.
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#12 Post by axur-delmeria » Fri Apr 07, 2017 11:46 pm

Report to us once you receive it. I'd like to know how much of a performance increase these little boards can give. :D
Daily driver: X220 4291-P79 i5-2520M

In reserve: X61 T7500, X60 T2300
In pieces: X60s CS U1300 [board only], two retired but working X61Ts
RIP: 760XD 9546-U9E

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#13 Post by ThinkPad560X » Fri Apr 07, 2017 11:54 pm

Image of the desktop with monitor. http://patcomps.weebly.com/
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#14 Post by axur-delmeria » Sat Apr 08, 2017 12:20 am

The screen matches well with the desktop even with a 15-year (or so) gap between the two, thanks to IBM's approach to aesthetics.
Daily driver: X220 4291-P79 i5-2520M

In reserve: X61 T7500, X60 T2300
In pieces: X60s CS U1300 [board only], two retired but working X61Ts
RIP: 760XD 9546-U9E

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#15 Post by ThinkPad560X » Sat Apr 08, 2017 1:13 am

I am going to be checking all my PCs CPU specs Name and its code name and need a simple plug and play software that can run on Windows 95-10. What is the easy to use CPU checker software?

I got CPU-Z and it works out fine for me.
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#16 Post by axur-delmeria » Sat Apr 08, 2017 1:34 am

Did you use the separate win98 version from the official site? I have no computer with win95 to confirm if it works.
Daily driver: X220 4291-P79 i5-2520M

In reserve: X61 T7500, X60 T2300
In pieces: X60s CS U1300 [board only], two retired but working X61Ts
RIP: 760XD 9546-U9E

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Re: IBM Personal System 2 8550 50Z Processor upgrade

#17 Post by ThinkPad560X » Sat Apr 08, 2017 2:38 am

I only did on Windows 2000 Pro so far. Trying to update Windows 98 but its not working anymore.
IBM: 700C,701C,760XD,770Z,600X,560X,560Z,570,310ED,380Z,390X, i1200,i1400,240,A22m,A22e,A30,G40, R31,R40,R50,R60,R61,T20,T23,T30,T40,T60,T61,X21,X30,X41,X41T,X60,X60T,Z60m, Z60T, X3200 Server, NetVista M41 6792,M41 6790,X40 Aptiva 2170,ThinkCentre S50,S50 Ultra,A50p,M50,M51,M82 WorkPad 20X,Z50

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