Vio buffer pointer question

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#2070

From: checker
Date: Thu, 15 Oct 1992 03:07

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I'm trying to get some Vio code working without any manuals (it was so
nice of IBM to include no documentation on the freaking API in the
WorkSet) and I'm having some trouble with direct video writes.

I'm creating a VIOMODEINFO struct (and filling in the cb member with the
size) and passing it to VioGetMode.  The buf_addr member has the correct
address after the call for the mode I'm in (0x000B8000) but I get a GP
fault when I try to write to it.  Do I have to do something before I can
do a direct video write?  Can I even _do_ a direct video write?  If not,
what is that pointer for?

Is there any example code around that shows how to do direct text mode
(graphics modes would be a bonus) video memory writes using Vio?

Chris

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Message-ID: <1998@acf5.NYU.EDU>

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Path: arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!iggy.GW.Vitalink.COM!cs.widener.edu!eff!sol.ctr.columbia.edu!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!ukma!rutgers!cmcl2!acf5!checker
From: checker@acf5.NYU.EDU (checker)
Newsgroups: comp.os.os2.programmer
Subject: Vio buffer pointer question
Message-ID: <1998@acf5.NYU.EDU>
Date: 15 Oct 92 03:07:59 GMT
Organization: New York University
Lines: 15