Solved Slowing Modern Computers using DOS

May 6, 2013 at 08:13:43
Specs: DOS 6.22, Intel P4 2.4GHz
We need to build a system - from new parts - that will run an old manufacturing machine operation program using DOS 6.22 as the OS. We found a suitable motherboard (we need ISA slots) that supports Intel Socket 423 CPUs. We installed a P4 2.4GHz CPU that is on Intel's embedded list and can still be purchased new. So far, so good. We have a buildable platform that supports the cards we need to put in the system.

Our problem is that the application runs way too fast for the machinery connected to the computer. The motherboard BIOS does not support underclocking, so we cannot slow the computer by that method. We can get a slower embedded P4 CPU, but we we will still be running in the 1.8GHz range, this application was designed to run on a system with a 233MHz clock.

What can we do to slow this system down so that it runs at a speed the machinery can keep up with?


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✔ Best Answer
May 6, 2013 at 10:26:51
Google for Mo'Slo and cpukiller. There were some others but can't recall the names right now.

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#1
May 6, 2013 at 09:14:52
How about buying an older computer system? I found this on eBay: Biostar M5ATA motherboard with 3 ISA slots, Pentium MMX 200Mhz & 16MB SDRAM.

http://www.ebay.com/itm/Biostar-M5A...


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#2
May 6, 2013 at 09:30:11
Soon some DOS guy will point you to the right slowdown software application to solve your issue. If however any attempt fails I will suggest an ultimate way to solve (again by software) the problem, but let me retain that as the last resort.

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#3
May 6, 2013 at 10:16:20
The system has to be new and repeatable as this is part of a business solution to replace the aging computers in old, but still useful, machine systems. The need for ISA bus slot would limit the availability of used parts in any case.

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#4
May 6, 2013 at 10:20:46
OK. Let's see what I get.

BTW, I stated socket 423. That was incorrect. Our preferred solution, using a desktop board, is socket 775 and there lot's of Intel embedded CPUs for this. The alternative is an SBC that has a socket PGA-478. There are fewer embedded CPUs to use in that format, and they are mostly in the 2GHz range.


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#5
May 6, 2013 at 10:26:51
✔ Best Answer
Google for Mo'Slo and cpukiller. There were some others but can't recall the names right now.

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Audares Juvo


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#6
May 6, 2013 at 11:29:43
Mo'slo looks good. I sense CPUkiller is designed to run with Windows and I will be running DOS natively. We will have a look. Thank you.

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#7
May 6, 2013 at 14:23:19
Here's a page to look at. Not sure how many of the links are any good.

Believe I used SlowDOS before but it didn't work well enough to make a Duron1300 work like a 486.

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#8
May 6, 2013 at 22:07:59
There's some more 'slow down' software here:

http://www.oldskool.org/pc/throttle...

Another thing you need to consider is you'll have a hard time installing dos on a SATA drive. It's probably best to make sure your motherboard has at least one IDE port to connect a regular IDE drive.

And of course 6.22 is FAT16 and only installs on partitions no larger than 2 gig so you won't need a huge drive to run it.

DAVEINCAPS - Made with REAL high fructose corn syrup.


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