🚀 go-pugleaf

In article <smithbm.721597007@craft.camp.clarkson.edu>, smithbm@craft.camp.clarkson.edu (Azrak) writes:
> 
> vincent@datmuc.UUCP (vincent) writes:
> 

> If you wish, I will post one of my TSRs for you to look at, but remember
> that it is completely in 8088 assembly, and I am not a CS major. The
> program might not be as efficient as possible, however it is quite
> stable and will not crash very easily.
> 
> - Brian  (smithbm@craft.camp.clarkson.edu)
> 
> As for my opinion for why it crashes, try saving all registers used
> in the interrupt routine. At least you will be at a "known state" and
> can go from there. Just remember to POP all registers in reverse order
> at the end of your routine.
> 
Hi Brian, 

your actual code was deleted when i read this article, but a frequent
problem which arises when writing tsr's is using DOS calls.

Dos is NON re-enterant. so you can not use calls to dos without first checking
the 'inDos' flag.  If Dos is busy and you still make a call, it will result in a 
corrupted stack and the system will crash.

-Bye Chris.  
 email: c.brennan@student.utas.edu.au.