[net.micro.pc] Vertical Blank Interrupt Vector

G.TANG@SU-SCORE.ARPA@sri-unix.UUCP (06/03/83)

From:  John Palevich <G.TANG@SU-SCORE.ARPA>

On page 2-64 of the Technical Reference Manual, IBM mentions
"Interrupt Level (Vertical Retrace) Level 2".

What does this mean?  In my ATARI home computer I can use a vertical
blank interrupt to write better games.  I'd like to do the same sort
of thing on my IBM; does anybody know how to do it?

P.S.  It's useful for non-game programs, too.