Path: utzoo!attcan!uunet!munnari.oz.au!metro!ipso!fawlty!johnmac
From: johnmac@fawlty.towers.oz (John MacLean)
Newsgroups: comp.sys.apple2
Subject: 3200 color pics and the VOC
Message-ID: <514@fawlty.towers.oz>
Date: 17 Sep 90 06:01:47 GMT
Organization: Tower Technology, Lane Cove, NSW
Lines: 22

Has anyone tried to display 3200 color pics with a video overlay card
present. I no longer have mine so I cannot try it out. I know the VOC
interferred with the video count registers so 3200 code relying on them
is potentially in danger of not working.

I want to try to get a VOC on loan for a while (again) so I can try out
320 x 400 with palette swapping => 6400 color pics. Yes, I know we only
have a palette of 4096 colors, but the principle should work.
You would need to work out of bank 0 and bank 1 on alternate vertical
blanks (to take the interlacing into account).
Does anyone know how to determine which bank ($E0 or $E1) is currently
being used for display - I need to determine this by software so that
synchronization can be achieved.

Guess I had better go looking for some flicker resistent glasses again :)

John MacLean.
-- 
This net: johnmac@fawlty.towers.oz.au                   Phone: +61 2 427 2999
That net: uunet!fawlty.towers.oz.au!johnmac             Fax:   +61 2 427 7072
Snail:    Tower Technology, Unit D 31-33 Sirius Rd,     Home:  +61 2 960 1453
          Lane Cove, NSW 2066, Australia.