🚀 go-pugleaf

> >I have a C program that stops the print spooler ( the PRINT command).
> >The spooler stops printing
> >whin this program is in control, and resumes normally when it exits.
> >
> Does the C-program grab interrupt 28h?  I believe that PRINT uses this
> interrupt to achieve a pseudo-form of multitasking.  When the machine
> is waiting around for you to type something, it ocassionally calls int
> int 28h when it is safe to do so.  See Best of BIX in the Sept issue
> of BYTE.
> 
More accurately, MSDOS raises INT 28H when it's in a keyboard input wait.
If the C program isn't doing keyboard input, or if the C doesn't use
MSDOS calls to read from the keyboard, you'd expect printing to stop.
This is why I have a HARDWARE print buffer.
-- 
{hplabs,amdahl,3comvax,okstate}!bnrmtv!perkins        --Henry Perkins

It is better never to have been born.  But who among us has such luck?
One in a million, perhaps.