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Article #80 (419 is last):
Newsgroups: freenet.sci.comp.atari.questions
From: ab170
Subject: VBLANK
Date: Sun Jul 30 09:12:26 1989


  Do you by any chance know the Verticle BLANK (VVBLKD) register?
"Mapping the Atari" says that the registers are 548 & 549, but
this isn't so.

  Tom Lekan (ab170)

** Answered by JOHN SUCHY (aa271) on Thu Mar 19 00:53:10 1987 **

        Please reread the section around548 in Mapping The Atari.  VVBLKD at
548,549 is a DEFERRED vector register.
The immediate VBLANK vector resides at
VVBLKI (546,547).

                        Your Co-sysop
                        John E. Suchy
                        aa271
           Thanks for asking.


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