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Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!haven!uvaarpa!galen!dale.acc.Virginia.EDU!sdm7g
From: sdm7g@dale.acc.Virginia.EDU (Steve D. Majewski)
Newsgroups: uva.vms,comp.sys.dec,comp.os.vms
Subject: VaxStationII/GPX Vert. Retrace Interrupts?
Message-ID: <659@galen.acc.virginia.edu>
Date: 23 Aug 89 17:42:51 GMT
Sender: acc@galen.acc.virginia.edu
Reply-To: sdm7g@dale.acc.Virginia.EDU (Steve D. Majewski)
Distribution: na
Organization: Academic Computing Center, University of Va.
Lines: 25


  I had a real-time data collection program running on a 
  VaxStation-I that required that the verticle retrace interrupts
   from the VCB01 be turned OFF. ( It required putting a scope
   on the Q-bus to watch the interrupt request lines to discover
   that this was the problem - the fact that there WAS such an 
   interrupt every 1/30th  ( or was it 1/60 ? ) sec. was sort of
  documented but not very prominently! ) 

   I am trying to port this code to a VaxStation II /GPX .
    
   1) Is this also necessary with the GPX/VCB02 board ? 

   2) How do I do it / What are the register definitions ?

   I have made several attempts to order documentation from DEC
   but nothing I have has the right info. If someone can send me 
   bit definitions for the VCB02 (and the part # of the manual I
   need ) it would be greatly appreciated. 

						Steve Majewski
						Dept. of Physiology
						University of Virginia
						(804)982-0831
						sdm7g@virginia.edu