Old PC for Old PLCs

We have an engineer who specializes in our old legacy automation systems.   These systems use PLCs from various suppliers... but many of the PLCs are obsolete and can be configured only with a DOS based computer.   We have been using an old Toshiba Satellite 100 CS with WIN98 that will let us boot into DOS.  This works fine, but this machine is fading rapidly.  The drive is fine... but looks like a motherboard is going.

I checked the internet and cannot find any second hand units for sale - part Yes, whole computer no.

What are other people doing in cases like this?

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What about something like this:

Those Dimension L series PCs were reliable.
contact schools - they may have old equipment.
or check on sites for older people -  they tend to keep things very long (i know - i do it myself)

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I use Gateway Solo 9100 or 9150 laptops for similar purposes.
There are usually a few complete machines on eBay.
They made zillions of the 9100's.
It was a popular model and very solid for a laptop.
The 9150 is an upgrade from the 9100 but less were sold because P3 came out about then.

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