void scrollupvdc(ushort X1, ushort Y1, ushort X2, ushort Y2)
{
uchar XLen;
ushort DispOfs, AttrOfs;
XLen = X2-X1+1;
DispOfs = Y1*vdcScrHorz+vdcDispMem+X1;
AttrOfs = Y1*vdcScrHorz+vdcAttrMem+X1;
for(; Y1 <= Y2; Y1++)
{
copymemvdc(DispOfs,DispOfs-vdcScrHorz,XLen);
copymemvdc(AttrOfs,AttrOfs-vdcScrHorz,XLen);
DispOfs += vdcScrHorz;
AttrOfs += vdcScrHorz;
}
}
void copydspvdc(ushort SDPage, ushort SAPage, ushort DDPage, ushort DAPage)
{
copymemvdc(SDPage,DDPage,vdcScrSize);
copymemvdc(SAPage,DAPage,vdcScrSize);
}
