Build Log: My DOS/Win98 playstation in old IBM 5170 shell

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Build Log: My DOS/Win98 playstation in old IBM 5170 shell

Postby retardware » 2019-3-10 @ 03:53

I am going to share the build, because it requires a bit of unusual tinkering.

Build aim:
To play DOS up to late Win95/98 games with maximum atmosphere and enjoyment factor on an upgraded 1985 IBM PC AT, using a flicker-free high-quality CRT monitor, M keyboard and first-generation MS mouse.


Build limitations:

-No ATX stuff allowed.
Must be a (baby) AT mobo.
-No SSD allowed.
Thus internal HDD must be fast, quiet and long-lived.
External HDDs must be attachable (U160+)
-Sound output must be digital (SPDIF) for both DOS and Windows.
Sound card must be PCI to avoid the ISA DMA performance bog.
-Case excludes many CPU options. Drive bay is where more modern mobos usually have their CPU/cooler combo.

Now the pics!

The "new" socket 370 Intel 810 mobo arrived yesterday from the former Soviet Union.
It is the only AT form factor mobo I was able to find that can take the 1400MHz Pentium 3 Tualatin without any additional contraptions like slockets, added voltage regulators etc, while running at full 133MHz FSB.

Image


The mobo.

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The included collection of slot shields was impressive.

But... ouch!

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The mobo turned out to be not really AT-compatible.
Where normally the screw for fixating the board goes, this board lacks the hole.
Instead there are posts for the soundcard/gameport and for COM 2.
Not good!
This has to be corrected somehow.

Image


Preparing for surgery.
(Pictures of the surgery will be shown only on explicit request :) )
After removal of the offending posts it looked this way:

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Much better!
But I was not willing to give up COM2, as the computer also must run Crosstalk (terminal emulator, console for beagleboard).

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So I attached a new header in a way so that the pins did no longer protrude from the underside of the PCB, instead there was a flat solder surface.
Using a connector as guide was helpful to keep fingers cool while soldering.
Without connector, it looked this way. Acceptable at least for me.

Image


But the board was dirty!
Sort of grime. It must have been either in a car workshop, or in a smokers' office.
I did not like the smell. So I decided that it has to take a bath in pure IPA.

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For better solvent effect, I warmed up the IPA to about 40 degs and then bathed and scrubbed the board thoroughly.
Perfectly clear before, the IPA was dirtily-brownish afterwards.

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Wow! So clean and shiny now!

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To avoid shorts, I put two layers of heatshrink tube over the screw post.

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BGA flexing is not recommendable.
So I added buffers to support the board.

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Even the holes' size of the mobo was wrong. Way too small.
So I even had to carve the plastics posts to make them fit.

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Phew!
Finally the mobo fitted.

Image

After that I threw in the cards.
From left to right:
-Generic S3 Trio64+ 2MB. (Just a provisory, because in this mobo the ATI Radeon 9250 I tried before somehow prevents the SCSI BIOS from starting. Will get a 4MB S3 graphics card soon to replace it)
-Terratec Soundcard MediaVision FM801 (or so), with Toslink output (for DOS gaming with SPDIF sound)
-D-Link gigabit ethernet card (Has drivers for DOS and MacOS 9 as well, curious testing this card)
-HDD controller

Now I am going to look through the DOS config, trying to get all important drivers in.

(To be continued with many new photos :) )
Last edited by retardware on 2019-3-10 @ 16:18, edited 1 time in total.
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Re: Build Log: My IBM 5170 DOS/Win98 playstation

Postby Anonymous Coward » 2019-3-10 @ 15:33

I don't think you can toss everything but the case, and then call it an IBM 5170.
...and then in the pictures you didn't even show the case!

Cool board though.
Will the highways on the internets become more few?
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium
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Re: Build Log: My IBM 5170 DOS/Win98 playstation

Postby retardware » 2019-3-10 @ 16:17

Anonymous Coward wrote:I don't think you can toss everything but the case, and then call it an IBM 5170.
...and then in the pictures you didn't even show the case!


Good point!
When I saved the computer from the scrapyard 20 years ago, it was still complete, with giant 80286 mobo and MFM HDD. Back then I didn't bother for the old cruft inside, threw them away except for the PSU, put in a Pentium 233 board and used it as secondary PC.
From the outside it still looks quite original.
So I'll change the thread title a bit to reflect this :)

Will show full photos later when all parts arrived (still waiting for graphics card and CRT monitor) and it is completely installed, configured and running fine.

But before this there are still some things/subprojects to be done which will yield some nice photos.
-Cleaning the PSU (need to look into it anyways, didn't open it for two decades).
-Fine-adjusting the drive bays (I am happy now that I did not throw away these AT case drive rails... but most of them are cloned and existed in many slightly different variations, so you have to pick one that matches best, and sometimes even to modify that)
-Making front panel cable extensions (the original cables are very short)
-Implementing a new reset button (the old one I glued at the back of the case has fallen off)
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Re: Build Log: My DOS/Win98 playstation in old IBM 5170 shell

Postby Jo22 » 2019-3-10 @ 16:59

Build limitations:
-No ATX stuff allowed.
Must be a (baby) AT mobo.

So it follows the AT specs, at least.
Technically, it's still an "AT class" computer like 386/486-es also were, even though not exactly a 286 machine. ;)
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

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Re: Build Log: My DOS/Win98 playstation in old IBM 5170 shell

Postby ynari » 2019-3-13 @ 14:39

It's pretty neat, but why no SSD? Modern hard disks will be far faster and quieter than anything available at the time, so I'd be inclined to stick in an SSD.

I presume the HDD controller is to get UDMA133 rather than UDMA100/66 inbuilt to the board?
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