Demo application crashing. \ VOGONS

Demo application crashing.

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First post, by rarefluid

Posted on 2008-02-05, 00:00

rarefluid Offline

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Hi people.

I have an old DOS protected mode multimedia-presentation here I wanted to run (http://www.scene.org/file.php?file=/parties/1 … mo/tour_by_.zip). It always crashes at the same point however.

I fired up a debug console, which prints this before dying and killing DOSBox with it:

1CPU: Illegal/Unhandled Opcode F
2PIC:0 mask FF
3PIC:1 mask FF
4INT10: Set Video Mode 3
5VGA: Blinking 8
6PIC:0 mask F8
7PIC:1 mask EC

EIP of the crash is 0x000109E4. The EXE is packed somehow though...
DOSBox then crashes with an access violation at adress 0. I tried some experimental 0.72 builds (ytwong) too, but got the same results.

Hope anyone can help or tell me this can/will be fixed some day.

cheers

rarefluid

Reply 1 of 36, by h-a-l-9000

Posted on 2008-02-05, 15:13

h-a-l-9000 Offline

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For me it crashes back to DOS after the credits...
(Yhkwong's build has grown a bit old)
Tries to use the opcode 0f 77 (SSE2 or something?)

1+1=10

Reply 2 of 36, by wd

Posted on 2008-02-05, 15:52

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Should be some MMX instruction, so bad luck.

Reply 3 of 36, by MiniMax

Posted on 2008-02-05, 15:53

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I don't see any credits. I *think* I see a green flash or something before it exits back to the DOSBox prompt. Tried various combinations of cores, cycles, ems, xms, ubm, all sound devices set to off/false, cga, tandy, pcjr, vga. Will only run with vga, otherwise complains about having to use UNIVBE.

Reply 4 of 36, by h-a-l-9000

Posted on 2008-02-05, 15:56

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I used my (dirty) latest CVS build.

1+1=10

Reply 5 of 36, by rarefluid

Posted on 2008-02-05, 17:45

rarefluid Offline

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0F77 seems to be the EMMS instruction, so it definitely uses MMX.
Sorry guys. haven't thought of that.

Are there any plan on adding MMX to DOSBox in the near future?

...find some video captures of old DOS demos here...

Reply 6 of 36, by wd

Posted on 2008-02-05, 17:51

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Nope, but i didn't check this demo yet, could be they're executing rubbish, too.

Reply 7 of 36, by h-a-l-9000

Posted on 2008-02-05, 17:58

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A 80386 with MMX? 😀

1+1=10

Reply 8 of 36, by rarefluid

Posted on 2008-02-05, 18:07

rarefluid Offline

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A 80386 with MMX? Happy

🤣. I should write before I think...

Nope, but i didn't check this demo yet, could be they're executing rubbish, too.

I don't really know, because I don't know of a way to show the code being executed before the application crahes...

...find some video captures of old DOS demos here...

Reply 9 of 36, by h-a-l-9000

Posted on 2008-02-05, 18:09

h-a-l-9000 Offline

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The program itself tells me

Attachments

Filename

dosbox_000.png

File size

3.13 KiB

Views

1721 views

File license

Fair use/fair dealing exception

1+1=10

Reply 10 of 36, by wd

Posted on 2008-02-05, 18:11

wd Offline

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Exception6 is unknown opcode, just in case you wondered.

Reply 11 of 36, by rarefluid

Posted on 2008-02-05, 18:12

rarefluid Offline

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but you don't see the instruction opcode getting executed. the exe is packed, so I can't have a look myself with a disassembler..

...find some video captures of old DOS demos here...

Reply 12 of 36, by wd

Posted on 2008-02-05, 18:13

wd Offline

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Get some debugger-enabled build of dosbox, should be easier than
disassembling a packed .exe
Either the intstruction is intentional (nothing you can do besides implementing
some mmx instructions) or it executes rubbish, where you'd have to look
WHY it executes that.

Reply 13 of 36, by h-a-l-9000

Posted on 2008-02-05, 18:18

h-a-l-9000 Offline

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Try Bochs 😉

http://bochs.cvs.sourceforge.net/bochs/bochs/ … .73&view=markup

1+1=10

Reply 14 of 36, by rarefluid

Posted on 2008-02-05, 18:19

rarefluid Offline

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I have a debugger build of Yk$%&whateverwongs experimental 0.72 builds. Can you point me to decent documentation about the debugger or tell me how to break program execution or step through the code?

That it crashes DOSBox should be considered a bug though! Executing a bad program shouldn't crash it imo...

...find some video captures of old DOS demos here...

Reply 15 of 36, by h-a-l-9000

Posted on 2008-02-05, 18:25

h-a-l-9000 Offline

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DOSBox is not supposed to run your nuclear power plant you know 😉

1+1=10

Reply 16 of 36, by rarefluid

Posted on 2008-02-05, 18:27

rarefluid Offline

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Try Bochs

Does it have a video capture capability?! I couldn't find information about that...
I could use it to check out what opcode it executes though...
The demo, if it uses MMX, fails to check the CPU type. Not good. People did nasty stuff in the past, but MMX wasn't that common back then, so I can't believe they didn't test for that...

...find some video captures of old DOS demos here...

Reply 17 of 36, by rarefluid

Posted on 2008-02-05, 18:28

rarefluid Offline

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DOSBox is not supposed to run your nuclear power plant you know

😉
Though you may be right, this should be a very common problem and already taken care of...

...find some video captures of old DOS demos here...

Reply 18 of 36, by h-a-l-9000

Posted on 2008-02-05, 18:32

h-a-l-9000 Offline

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It's probably fixed in latest CVS as it didn't crash for me.

1+1=10

Reply 19 of 36, by wd

Posted on 2008-02-05, 20:18

wd Offline

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It does NOT crash with 0.72 for me.

this should be a very common problem and already taken care of...

A dos game executing mmx stuff while not checking for the processor
type is a common "problem"? DOSBox fully takes care of that in throwing
exception6 which is what a real non-mmx processor does.

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