illegal descriptor type 0 for int D2

[chris5050]

I have just downloaded vDos to try it for the first time to see if it will allow me to run my old DOS program under Windows10 64bit.

I get this error    illegal descriptor type 0 for int D2

when the program starts up.

I am just asking if you have any more information about what this means, please??

[Jos]

Hard to tell, your program is running in protected mode, and the emulated CPU gets hardware interrupt D2.
That interrupt is however never generated in vDos. Can you start vDos with the log option (….vDos.exe /log) and submit the generated vDos.log file.

Jos

[chris5050]

Here is the log file:

vDos 2020.03.01
C: => (Local) C:\vDos\

38.68 Execute: xrun5.exe - mainmenu.pgm
Int 2f unhandled call 1600
Int 2f unhandled call 1687
Int 1B => 47b:0002
Int 23 => 47b:0013
Int 24 => 199:26ce
Int 28 => 47b:002a
Int 15 => 47b:002f
Int 1C => 47b:0025

[Jos]

That doesn’t clarify much. Can you send me (by wetransfer) the XRUN5.EXE file. The program doesn’t access any file before the exception, so that will do.

Jos

[chris5050]

Hi Jos,
The exception seems to happen in MainMenu.pgm (a BASIC program I wrote).
XRUN5.EXE is the runtime BASIC language.

If I call XRUN5.EXE ACCOUNTS.PGM (a program normally called from MainMenu)
then I get a normal error from Accounts: eg File Not Found (since MainMenu has not set up the filenames, etc)
But no vDos error for unhandled call.

I will try to find the source code for MainMenu (last used about 15 years ago) and see if I can spot likely causes. From memory I think it could be setting screen colors, calling DOS commands, loading several other programs that each go into a separate 64k area of memory (handled by XRUN5).

If any of those are likely to be illegal under vDos please comment. Otherwise do not worry any further :-)
And thank you very much for your support so far.

Chris

[Jos]

The exception you get can’t be explained by anything done by your program.
Even not by vDos going entirely bogus. The routine handling hardware interrupts and eventually generating that exception is simply never called with interrupt number D2.

Jos