Re: [Freedos-user] FreeDOS 1.1 crashing in VirtualBox 5.0.22

[Rugxulo]

Hi,

On Tue, Jun 28, 2016 at 10:08 AM, Eric Auer  wrote:
>
> I think that even 597 kB of low DOS memory is plenty for old DOS programs.

"597 kb should be enough for anyone." -- Eric Auer, 2016:-)

In Abe's recent screenshot, he shows that he's now getting (thanks to
Ulrich) "628 kb" free. This is actually "643,488" bytes! That's
plenty! (It's easy to forget that "kb" is not equal to 1000.)

Seriously, I can't speak for all apps, but it's rare to need (much
more, if any) greater than 500 kb. Needing 600 kb is almost unheard of
(right??). At least, I only vaguely remember one demo (submerge??)
that needed over 600,000 bytes free. And even that was probably badly
designed. Some games require more than 500 kb, but that too is of
questionable design. Most well-behaved apps (yeah, I know that's not
saying much) don't really need that much.

My own VBox setup "only" gets 596 kb (610,544) free. That's HimemX
only (and FreeCOM XMS_Swap, of course; and yes, packet driver can vary
a lot in size, too). I can't remember exactly, but my native FreeDOS
install is also similar, and I see no huge problems. Though it's
impossible to test everything, of course.

Can anyone provide real-world usage examples of needing 600,000 bytes
or more free?? (Besides obvious things like user data or combining
several TSRs.) Do any popular apps from yesteryear need that much?

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Re: [Freedos-user] FreeDOS 1.1 crashing in VirtualBox 5.0.22

[Ulrich Hansen]

> Am 01.07.2016 um 14:59 schrieb Abe Mishler :
> 
>> 
>> 1?DEVICE=C:\FDOS\BIN\JEMMEX.EXE NOEMS X=TEST I=B000-B7FF I=C800-EFFF
>> NOVME NOINVLPG
>> 
> That works like a charm! Do those regions work for you?

Yes. I tested it on a FreeDOS 1.1 guest on my Mac. 

And, as I don’t have Windows machine anymore, I started a Windows 10 VirtualBox 
guest, and inside of it I used VirtualBox for Windows and tested it there with 
a FreeDOS 1.1 guest. Normally JEMMEX crashes there, but not this time.

> Could you provide an explanation regarding those regions?

Actually they discussed it in the VirtualBox forum:

https://forums.virtualbox.org/viewtopic.php?f=4=77078=4702e57e2da69b00248e9a82eeffbe98
 


Seems some people at Oracle are still interested in DOS.

> I will now revisit my decision to use QEMU on linux... except linux can 
> mount raw images for native file sharing without having to FTP into 
> FreeDOS (which I got working).

Yes, this is nice. On OS X you can just double-click the image to mount it.

Just a quick review about qemu and networking: 

Networking with qemu is difficult. Per default it uses NAT, but only for TCP. 
So I can’t ping the outside world. WGET works. I managed to transfer files with 
FileZilla to mTCP ftpsrv. (Which is a miracle as all other clients won’t even 
do a directory listing.)

For bridged networking I’d have to install a TUN/TAP software on the host. 
Complicated.

I start qemu with:

qemu-system-i386 -hda freedos.img -boot c -m 32 -netdev 
user,id=usernet,net=192.168.3.0/24,dhcpstart=192.168.3.101 -device 
pcnet,netdev=usernet -redir tcp:2121::21

With „-device pcnet“ qemu supports the AMD PCFastIII (pcnet) network card, so 
the packet driver in FreeDOS 1.1 (PCNTPK) can be used. 

> Thanks a lot for re-opening my can of worms!!! :-p

Brr. :-)

Good luck!!

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Re: [Freedos-user] FreeDOS 1.1 crashing in VirtualBox 5.0.22

[Abe Mishler]

Hi Ulrich!

On 7/1/2016 3:35 AM, Ulrich Hansen wrote:
>
>> Am 01.07.2016 um 01:51 schrieb Abe Mishler > >:
>>
>>  I have been learning a lot about JEMMEX as compared to the other
>> drivers lately.
>
> Hi Abe,
>
> If you don’t mind, it would be great if you could try one last thing
> with VirtualBox and JEMMEX:
>
> Please try to start JEMMEX with this line in FDCONFIG.SYS:
>
> 1?DEVICE=C:\FDOS\BIN\JEMMEX.EXE NOEMS X=TEST I=B000-B7FF I=C800-EFFF
> NOVME NOINVLPG
>
That works like a charm! Do those regions work for you?

Could you provide an explanation regarding those regions?

I will now revisit my decision to use QEMU on linux... except linux can 
mount raw images for native file sharing without having to FTP into 
FreeDOS (which I got working).

Thanks a lot for re-opening my can of worms!!! :-p

Seriously though, after all of my learning, I think I had decided 
yesterday to walk away from JEMMEX ... (circling back around) in which 
case VirtualBox works just fine... decisions, decisions... grrr.

http://tinypic.com/r/30hq7gi/9

Extended (XMS), Total=32,704K, Used=6,005K, Free=26,699K
Total Expanded (EMS) = 8,576K
Free Expanded (EMS) = 8,192K
Largest executable program size = 628K
Largest free upper memory block = 137K

Thanks!

> Important are both includes I=B000-B7FF I=C800-EFFF.
> Does this change anything for you? Does it still crash?
>
> Thanks!
>
>
>
>
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> Attend Shape: An AT Tech Expo July 15-16. Meet us at AT Park in San
> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
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> everyone, including kids. Get more information and register today.
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>
>
>
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Re: [Freedos-user] FreeDOS 1.1 crashing in VirtualBox 5.0.22

[Ulrich Hansen]

> Am 01.07.2016 um 01:51 schrieb Abe Mishler :
> 
>  I have been learning a lot about JEMMEX as compared to the other drivers 
> lately. 

Hi Abe,

If you don’t mind, it would be great if you could try one last thing with 
VirtualBox and JEMMEX:

Please try to start JEMMEX with this line in FDCONFIG.SYS:

1?DEVICE=C:\FDOS\BIN\JEMMEX.EXE NOEMS X=TEST I=B000-B7FF I=C800-EFFF NOVME 
NOINVLPG

Important are both includes I=B000-B7FF I=C800-EFFF. 
Does this change anything for you? Does it still crash?

Thanks!


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