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name            scrollup  --  hardware scroll

synopsis        VOID scrollup(up,lf,lo,rt,n,atr)
                COUNT up,lf;   upper left location
                COUNT lo,rt;   lower right location
                COUNT n;       number of lines to scroll
                COUNT atr;     attribute for new line

description  This function preforms a hardware scroll up
           on the location described by up,lf and lo,rt
           n number of lines with atr as an attribute.