Sunday December 17 1995, Peter Fitzsimmons writes to Kevin Ring:

 KR>> Is it possible to create a non-PM 32 bit OS/2 native
 KR>> program that uses graphics modes (such as mode 13h)?

 PF> Yes.  Here is a mode 13 (320x200x8bit) sample.

Interesting to see this... Can you suggest a source for lots of non-PM
graphics? BTW where can I get any info on these modes? I've never heard of
mode 13.

 PF>  //icc /G4 /Q /Smes /W3 /Kb+ /O /Oi20 /Gs /Gm circ_fs.c

I got an error using /Oi120 :-

CIRC_FS.C(0:0) : warning EDC0463: Option /Oi20 is not valid.

This is using IBM C Set/2 v1.0.

 PF>      setmode();
 PF>      viopb.pBuf = (PBYTE) 0xA0000L;
 PF>      viopb.cb = 64000L;
 PF>      VioScrLock(LOCKIO_WAIT, (PBYTE) &fStatus, 0);
 PF>      VioGetPhysBuf(&viopb, 0);
 PF>  #if 0
 PF>      pchScreen = MAKEP(viopb.asel[0], 0);

What is MAKEP ?

Your sample code is useful but difficult to follow since I don't have any
references on what's going on. I can't even work out which instruction is
outputting to the screen. Are there any books which you would consider
useful wrt graphics?

BTW I got a Trap E IPE when I tried running the program after compiling it.
This is with an IBM XGA card, and the C Set/2 compiler. I was using the
headers from C++ Beta v3 (pre-VAC) - would that have caused the problem?

John
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mailto://jpolt{at}bradnet.demon.co.uk

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