etoromu wrote on 2020-05-31, 01:44:

Caluser2000 wrote on 2020-05-31, 01:24:

Intel486dx33 wrote on 2020-05-30, 07:28:

Did you set the motherboard jumpers for a 486dx2-33 CPU ?

Can you show me a picture of this mythical 486dx2-33 cpu please?

This is currently my refurbished IBM ps1 2155 CPU, I thank the user Intel486dx33 for motivating me to restore my precious computer again.

Yes, that is the same type of PS/1 I have but there are about 7 different variants. The motherboards are different.
It all depended on what store you purchased it from and what year. Different stores carried different configurations of this PS/1 computer.
It was very confusing.

Intel486dx33 wrote on 2020-05-31, 01:49:

Yes, that is the same type of PS/1 I have but there are about 7 different variants. The motherboards are different. It all depen […]
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etoromu wrote on 2020-05-31, 01:44:

Caluser2000 wrote on 2020-05-31, 01:24:

Can you show me a picture of this mythical 486dx2-33 cpu please?

This is currently my refurbished IBM ps1 2155 CPU, I thank the user Intel486dx33 for motivating me to restore my precious computer again.

Yes, that is the same type of PS/1 I have but there are about 7 different variants. The motherboards are different.
It all depended on what store you purchased it from and what year. Different stores carried different configurations of this PS/1 computer.
It was very confusing.

Totally agree, starting with the video memory, since your board comes from the factory with 1mb of video unlike mine, which only came with 512kb and was expandable. Finding the expansion was very complicated, but I did it and I already have my pc with 1mb of video.

It was really so emotional to be able to see the screen with 16 bits of colors when all my childhood I only saw it with 256 colors.

See this posts:
IBM PS/1 Consultant 1993 with Sound blaster.

You need to switch the motherboard jumpers when you add cache.
I could not find the document image but it is online somewhere.
It might be in the manual too.

Here it is CPU and Cache jumper settings and video ram info and how to disable onboard video so you can add your own video card.
Also the Multimedia version of these PS/1 computers came with a Sound Blaster CT1770 or CT1740

I tried an IBM 486dx2-66 “Blue Lighting” CPU in this computer and it worked.
The Bios showed it as a “Cyrix” CPU.

etoromu wrote on 2020-05-31, 01:57:

Intel486dx33 wrote on 2020-05-31, 01:49:

Yes, that is the same type of PS/1 I have but there are about 7 different variants. The motherboards are different. It all depen […]
Show full quote

etoromu wrote on 2020-05-31, 01:44:

This is currently my refurbished IBM ps1 2155 CPU, I thank the user Intel486dx33 for motivating me to restore my precious computer again.

Yes, that is the same type of PS/1 I have but there are about 7 different variants. The motherboards are different.
It all depended on what store you purchased it from and what year. Different stores carried different configurations of this PS/1 computer.
It was very confusing.

Totally agree, starting with the video memory, since your board comes from the factory with 1mb of video unlike mine, which only came with 512kb and was expandable. Finding the expansion was very complicated, but I did it and I already have my pc with 1mb of video.

It was really so emotional to be able to see the screen with 16 bits of colors when all my childhood I only saw it with 256 colors.

Hi, I admire the work you have done, I love old IBM home computers. At the moment I'm working on restoring a PS1 2133-540 (my first ms-dos computer, it's a recent purchase since my old pc is lost adnato) and I was looking for a video memory upgrade: could you tell me how / where did you find it? Thank you so much for the time you want to dedicate to me

etoromu wrote on 2020-05-30, 22:22:

etoromu wrote on 2020-05-30, 22:18:

Intel486dx33 wrote on 2020-05-30, 07:28:

Did you set the motherboard jumpers for a 486dx2-33 CPU ? Did you change the cache jumpers for the amount of cache you are using […]
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Did you set the motherboard jumpers for a 486dx2-33 CPU ?
Did you change the cache jumpers for the amount of cache you are using ?
You also need to enable/disable cache in bios settings.
See manual for your motherboard type and jumper settings
http://ps-2.kev009.com/pccbbs/aptiva/63g2028.pdf

Thank you very much for the help, I have followed the manuals and I have even supported myself with the configuration of jumpers on your board. however the problem persists. I have taken pictures with the cache installed and others where I only removed the tag memory and setting the cache to 0, the processor and the bus work perfectly. I really don't know what else I could do.

The images without tag memory

I think the problem is in BIOS. The CMOS setup in your machine reported 8k internal (L1) cache while test software reported 16k of L1 cache (and this is true for DX4 processors).
The BIOS dated 12/16/93 but DX4 processors (with 16k L1) released since middle 1994.
I've got same issue on my PS/1 machine type 2168 model 452 when I've installed DX4ODP75 CPU with 16k L1. So I've go back to DX2 CPU with 8k L1.

Does anyone have ROM BIOS dump dated 1994 or later for this PS/1?

Does anyone have the owners manual for this PS/1 with “rapid resume”
I am trying to figure out exactly how it works.
And the bios settings ?

When I enable this option the computer will only go into standby mode and not turn off.
It always stays on. It just goes in a loop from “ON to Standby”.

If I disable this option in bios. I can turn the computer on and off using the power button.