Re: [Freedos-user] dma crosses 64k boundary error

[Rugxulo]

Hi,

On Tue, Aug 23, 2016 at 12:28 PM, Tom Ehlert  wrote:
>>
>> I keep getting the error dma crosses 64k boundary when using tools
>> like rawrite3 or hard drive manufacturers tools floppy creation
>> software. I need to boot from Windows 98 bootdisk to get rid of it.
>
> I'm still surprised this comes up today, and not 15 years ago.
> do you have remarkable hardware?

Is it possible that different tools don't exhibit the same behavior / bug?

So, just for comparison, there are various other tools to write floppy
images to physical disk:

1). FD diskcopy
http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/dos/diskcopy/0.9/

2). sfx14436 (stub)
https://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/tools/

3). FreeBSD fdimage.exe
http://ftp-archive.freebsd.org/pub/FreeBSD-Archive/old-releases/i386/4.8-RELEASE/4.8-RELEASE/tools/

4). PLoP's diskimg
https://www.plop.at/en/dostools.html#diskimg.com

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Re: [Freedos-user] dma crosses 64k boundary error

[Dimitris Zilaskos]

Hi,

Hi,

Thank you for your reply. Hardware is a year 1995 486-DX4 100, hardly
remarkable at its time.

Cheers,

Dimitris


On Tue, Aug 23, 2016 at 6:28 PM, Tom Ehlert  wrote:

> > I keep getting the error dma crosses 64k boundary when using tools
> > like rawrite3 or hard drive manufacturers tools floppy creation
> > software. I need to boot from Windows 98 bootdisk to get rid of it.
>
> > Please let me know if there is a way to get rid of this problem under
> FreeDOS.
>
> MSDOS redirects int 13 to an internal driver, detects DMA access crossing
> a 64k boundary,
> and avoids it.
>
> FreeDOS ddoes not do this; sorry.
>
> there was no need to do this so far; IMO rawrite3 could/should handle
> this by itself. of course, software is usually only tested against
> MSDOS, so there is little motivation to do so for rawrite3
> programmers.
>
> I'm still surprised this comes up today, and not 15 years ago.
> do you have remarkable hardware?
>
> Tom
>
>
> 
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Re: [Freedos-user] dma crosses 64k boundary error

[Tom Ehlert]

> I keep getting the error dma crosses 64k boundary when using tools
> like rawrite3 or hard drive manufacturers tools floppy creation
> software. I need to boot from Windows 98 bootdisk to get rid of it.

> Please let me know if there is a way to get rid of this problem under FreeDOS.

MSDOS redirects int 13 to an internal driver, detects DMA access crossing a 64k 
boundary,
and avoids it.

FreeDOS ddoes not do this; sorry.

there was no need to do this so far; IMO rawrite3 could/should handle
this by itself. of course, software is usually only tested against
MSDOS, so there is little motivation to do so for rawrite3
programmers.

I'm still surprised this comes up today, and not 15 years ago.
do you have remarkable hardware?

Tom


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