/*
SG C Tools 1.2

(C) 1993 Steve Goldsmith
All Rights Reserved

Compiled with HI-TECH C 3.09 (CP/M-80).
*/

#include <hitech.h>
#include <vdc.h>

uchar  vdcScrHorz;
uchar  vdcScrVert;
ushort vdcScrSize;
ushort vdcDispMem;
ushort vdcAttrMem;
ushort vdcCharMem;
ushort vdcCharMemSize;
uchar  vdcCharBytes;
uchar  vdcCharVert;
ushort vdcBitMapMemSize;

/* set global 'vdc' prefixed vars from current vdc settings.  the char mem */
/* value is only correct if character set is at 2000, 6000, a000 and e000. */

void mapvdc(void)
{
  vdcScrHorz = invdc(vdcHzDisp);
  vdcScrVert = invdc(vdcVtDisp);
  vdcScrSize = vdcScrHorz*vdcScrVert;
  vdcDispMem = (invdc(vdcDspStAddrHi) << 8)+invdc(vdcDspStAddrLo);
  vdcAttrMem = (invdc(vdcAttrStAddrHi) << 8)+invdc(vdcAttrStAddrLo);
  vdcBitMapMemSize = 16000;
  vdcCharVert = (invdc(vdcChTotalVt) & 0x1F)+1;
  if (vdcCharVert > 16)
  {
    vdcCharMem = (invdc(vdcChSetStAddr) & 0xC0) << 8;
    vdcCharBytes = vdcMaxCharBytes;
    vdcCharMemSize = (vdcCharsPerSet*vdcCharBytes) << 1;
  }
  else
  {
    vdcCharMem = (invdc(vdcChSetStAddr) & 0xE0) << 8;
    vdcCharBytes = vdcMaxCharBytes >> 1;
    vdcCharMemSize = (vdcCharsPerSet*vdcCharBytes) << 1;
  }
}