[syslinux] booting from MS-dos disk.

[Dinesh P.]

Hi, there
            Thanks for reply. actually i want to run DOS based program which 
is located on Windows share that's why i want to map windows share and i 
have tryied with himem, XMS etc. for breking 640 k barrier but still that 
DOS based program created in foxpro give error of insufficient memory. can u 
suggest me any other solutions for running dos based program with diskless 
PC, which contains Windows PXE boot and also DOS boot.

Regards,
Yogesh
----- Original Message ----- 
From: "Bernd Blaauw" <bblaauw at home.nl>
To: "SYSlinux" <syslinux at zytor.com>
Sent: Thursday, September 01, 2005 5:14 PM
Subject: Re: [syslinux] booting from MS-dos disk.


> Dinesh P. schreef:
>> Hi, there
>>            Well i am currently using DOS 6.22 bootdisk for booting from 
>> memdisk with network drivers for connecting windows share on network, so 
>> i want to know that is it possible to break dos 640k memory limition 
>> using WinXp DOS boot disk with network drivers. please tell me if it is 
>> possible.
>
> not possible, the bootdisk that Windows XP creates contains a Windows 
> Millennium kernel (io.sys, msdos 8.00) and command.com and a few other 
> files, most of them useless (SYS and FORMAT cannot handle C:, blame 
> Microsoft).
>
> BartPE, WinPE and perhaps ReactOS are suitable environments for getting 
> rid of a 640KB limitation if you insist on booting from a non-harddisk 
> device. Also available are Linux live cdroms. You're simply not indicating 
> what your purpose is with the windows share, so nobody can determine which 
> operating system is required.
>
> Any DOS has a 640KB limit for conventional memory by definition.
> The only thing you can do to increase the amount of memory is using XMS 
> (extended memory), HMA (put the kernel there, through use of DOS=HIGH) and 
> UMB (upper memory).
>
> MSDOS 7 and newer (and other DOS flavours) have increased possibilities to 
> make use of UMB. Examples are FILESHIGH, BUFFERSHIGH, SHELLHIGH etc.
> You'll have to compare memory use and available memory of different DOS 
> flavours and versions yourself.
>
> I'm certainly not claiming FreeDOS would be best for your purpose, but on 
> the other side you don't need a license from Microsoft for using it.
> (and they no longer support/sell DOS)
>
> I hope you'll be able to use your WinME bootdisk created on XP by 
> appending 'RAW' keyword to your pxelinux configuration file.
>
> Bernd
>
>
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