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Index > DOS > fasm.exe in dosemu does not run

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percy_vere_uk



Joined: 11 Apr 2011
Posts: 8
Location: Dorset Uk
percy_vere_uk
Hi

I am using fasm17117.

'fasm.exe pong.asm' (which I found on this forum) assembles fine in dosbox but when I try to

use it in dosemu the window closes with no output.

fasmd.exe pong.asm runs in dosemu and disassembles ok

I have tried 'a86' in dosemu and that works fine.

Any idea's

percy
Post 01 Jun 2014, 12:35
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7532
Location: Kraków, Poland
Tomasz Grysztar
fasmd always uses DPMI, while regular fasm tries to use the 32-bit real mode and switches to DPMI when that fails. Probably dosemu has a problem with emulating this mode and crashes when fasm checks whether it works?
Post 01 Jun 2014, 12:42
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percy_vere_uk



Joined: 11 Apr 2011
Posts: 8
Location: Dorset Uk
percy_vere_uk
Tomasz

Thanks for that I will have to look to see If I can setup DPMI in dosemu.conf
Post 02 Jun 2014, 12:09
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 7532
Location: Kraków, Poland
Tomasz Grysztar
You probably already have DPMI support, since you are able to run fasmd (which can run only with DPMI). But the problem is that fasm first checks whether the processor supports the 32-bit real mode, and only when this fails, it uses DPMI instead. Since the emulator probably crashes on that check, the only way to get around it would be to make fasm skip this check entirely - for example by running it in V86 mode (when processor is not in real mode, fasm goes straight to DPMI variant). You can usually force DOS to run in V86 mode by installing some EMS driver.
Post 02 Jun 2014, 13:51
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percy_vere_uk



Joined: 11 Apr 2011
Posts: 8
Location: Dorset Uk
percy_vere_uk
I am running dosemu in a linux gentoo 64bit system.

Code:
.dosemu/boot.log  gives    {WARN: vm86plus service not available in your kernel}    


So it appears that vm86 needs to be enabled in the kernel. After further research and According to 'http://forums.gentoo.org/viewtopic-t-705463-view-previous.html?sid=b0dc20f9f1b52235c46ef46bce449c24'

it is only available in a 32bit or 16 bit system

So it looks as though I cannot get fasm to run in a 64bit system.

Unless anyone knows differently that is!

percy
Post 06 Jun 2014, 13:10
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16942
Location: In your JS exploiting you and your system
revolution
percy_vere_uk wrote:
So it looks as though I cannot get fasm to run in a 64bit system.
There are also 32-bit versions for Win32 (in WINE?) and Linux32. I would be surprised if neither of those an be run in 64-bit Linux.
Post 06 Jun 2014, 13:14
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