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OS/2, what is "not that fast" enough...

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First post, by cprieto

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I heard OS/2, early versions, have problems booting and installing with a " fast" CPU (anything beyond 386 or 486 won't work, without modifying the binary). I was wondering, what does "fast" mean here? I mean, there are 100MHz 486 CPU's, is that "too fast" for OS/2 1.1?

I would love to know a little more about what is the max CPU speed (and type) needed for OS/2 1.0, 1.1 to run without changing the binary.

Reply 1 of 7, by Caluser2000

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Personally I don't run anything earlier than Warp v3 which runs fine on a K6-2 266 test rig. v3 is faster than v2 as well as having more features.

I have boxed sets of OS/2 from IBM 1.3EE up to v4.0 Server.

Last edited by Caluser2000 on 2020-12-30, 04:49. Edited 1 time in total.

There's a glitch in the matrix.
A founding member of the 286 appreciation society.
Apparently 32-bit is dead and nobody likes P4s.
Of course, as always, I'm open to correction...😉

Reply 2 of 7, by cprieto

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A little more information about installing OS/2, apparently the versions facing the run problem are 1.0, 1.1, 1.2 and 1.3 (see http://www.os2museum.com/wp/installing-os2-1- … -virtualbox-vm/), though it mentions 386 as "fast" in other documents it mentions 486 as well (https://www.os2museum.com/wp/os2-history/os2-1-1/).

Reply 3 of 7, by cprieto

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If anyone is interested, I did a few tests and apparently the fastest CPU you can use (without patching the files) is i486DX2 CPUs, anything faster than that (for example, i486DX4/75) won't boot at all without patching the installation files.

Reply 4 of 7, by Jo22

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Cool, thanks for the information! 😎

So far, I've did some testing with OS/2 1.x in a VM and on a 286 only.
I vaguely remember there were some differences with the MS and IBM releases.
The MS releases included some more 386 code, if memory serves.

"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

//My video channel//

Reply 5 of 7, by Cyberdyne

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Microsoft OS/2 1.3 runs fine in Pentium MMX machine. OS/2 2.11 also runs fine in Pentium MMX. Warp runs in even a Pentium 3. My experience.

I am aroused about any X86 motherboard that has full functional ISA slot. I think i have problem. Not really into that original (Turbo) XT,286,386 and CGA/EGA stuff. So just a DOS nut.
PS. If I upload RAR, it is a 16-bit DOS RAR Version 2.50.

Reply 6 of 7, by dr.zeissler

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OS/2 Warp3 installation quit with error3. I now change the drivers because the HDD is larger than 8GB (40GB)
Machine is P3/500 512MB IntelBX440 AtiRageProLT Onboard.

Retro-Gamer 😀 ...on different machines

Reply 7 of 7, by Caluser2000

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dr.zeissler wrote on 2020-12-11, 11:44:

OS/2 Warp3 installation quit with error3. I now change the drivers because the HDD is larger than 8GB (40GB)
Machine is P3/500 512MB IntelBX440 AtiRageProLT Onboard.

Well known and documented issue. There are very good tutorials to rectify it. How many over gig IDE drives in 1994?

There's a glitch in the matrix.
A founding member of the 286 appreciation society.
Apparently 32-bit is dead and nobody likes P4s.
Of course, as always, I'm open to correction...😉

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