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Thread ID: 37489 2003-09-09 00:28:00 Max CPU Speed for DOS & 9x rsbluck (4539) Press F1
Post ID Timestamp Content User
173995 2003-09-09 06:41:00 Just make sure your motherboard driver supports W98 or there is a driver that will. I tried to put W98 on a 2.4 AMD Asus nForce2 board and had to REALLY search a lot before I found the proper driver. Rod ger (316)
173996 2003-09-09 06:53:00 Roger,

Thanks. The Athlon 2.4 - was that its real clock speed, or was it what AMD calls 2400+ with a MHz less than this but a performance claim equiv to 2.4GHz. If the latter case was the actual clock speed less than 2 GHz which is being claimed as the max allowable for 9x.

Thanks. RSBluck
rsbluck (4539)
173997 2003-09-09 07:01:00 Yeah labelled 2.4 Rod ger (316)
173998 2003-09-09 07:05:00 Hi rsbluck, I recentlly installed win95 on an amd k6-3 400mhz pc & had to set the clock speed down to 300Mhz.
It is a known issue with AMD proccessors over 300Mhz.
once the patch was installed win 95 ran sweetly.

Cheers Steve
Steve Askew (119)
173999 2003-09-09 09:36:00 > I ... have been advised by a local computer maker that DOS and 9x
> operating systems wont run on CPU's with speeds above
> about 2 GHz.

DOS itself isn't affected, but some of the programs written for DOS may be, since hardware-specific code (i.e. drivers) are actually built into DOS applications. It's kind of like building part of an operating system with each new application.

The problem is that these DOS programs are generally now considered obsolete by their developers and hence are unsupported. The implication of this is that when initialising a soundcard, for example, the application tries many times (up to 65536 times) to get a response, after which the card is not detected. On today's fast processors (even an Athlon-1400), 65536 tries is not long enough for the soundcard to initialise itself and respond, so the application would not be able to use it.

The good news is that there are utilities to try and slow down the rate of execution for DOS applications, but if the CPU clock is also used in other parts of the application these tasks will be much slower than expected. There is a free utility, DOSBox (http://dosbox.sourceforge.net/), which is still under development. It may be targeted for (nostalgic) computer gamers, but it should run other applications as well if they won't work under Windows. Since it is still in development, not everything will run perfectly, if at all.

CPU speed isn't a problem for Windows 9x, but there may be some other hardware issues. Hard disks larger than 4GB need to use the FAT32 file system, newer hardware needs Win'9x drivers, and the physical RAM needs to be within Windows' limits (whatever they are, but it seems that anything less than 1GB will be fine). Other than that, Windows 98SE should run as normal - if the salesperson is saying it won't run, they're probably trying to push more sales of XP.
D. McG (3023)
174000 2003-09-09 10:08:00 Steve,

Thanks. I think the air is being to clear re AMD CPU's, but has a way to go re high speed P4's.

Regards. RSBluck
rsbluck (4539)
174001 2003-09-09 10:18:00 D . McG

Thanks for your expanded reply . Interesting stuff . I think I am on top of file system and partition sizes which are acceptable to 98 (with the emphasis on "think"), and I believe you may have a point re the computer makers attitude . It was this suspicion that prompted me to try and find out if there was any truth to the claim .

Regards . RSBluck
rsbluck (4539)
174002 2003-09-09 11:04:00 I have set up dual booting Win XP Pro and Win98SE using an AMD 2800+ CPU.

I also use a DOS program ( Termail ) for FidoNet under WinXP Pro.

I dumped Win98SE after I got drivers for my hardware.

Is it possible that the local computer maker has it wrong about the dual boot system?

You need to make sure when when you partition your hard disk that both WinXP and Win98SE can read the file system.
Win 98SE can't read NTFS. WinXP can read both NTFS and FAT32.

In MY Humble Opinion there is no SPEED problem as you mention it.
There will be a speed promlem with some programs compiled in TurboPascal.

Just why do you want to dual boot??

Hardware drivers??
Elephant (599)
174003 2003-09-09 13:43:00 I'm not aware of any issues with running Dos Win9x on fast modern PCs

Seems like a waste having to run that fast CPU and use such an old OS and dualboot XP

Could I suggest you consider trying out Virtual PC www.microsoft.com/virtualpc then you can run XP and run Win9x in a virtual environment inside a window in XP

Regards
Nathan
nmercer (3899)
174004 2003-09-09 13:45:00 You will also want to check this hotfix available for CPUs with 2.2GHz and faster

312108 - Windows Protection Error in NDIS with a CPU That Is Faster Than 2.1 GHz

support.microsoft.com

Regards
Nathan
nmercer (3899)
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