Genicom GEK 00031B Programmer's Manual page 121

ESC Z n1 n2 v1...vn Quadruple-Density Graphics (Reduced Speed): Sets a density of
GEK-00029B
240 dpi horizontally and 72 dpi vertically. If horizontally adjacent
dots are specified, then the second dot is not printed.
Decimal: 27 90 <n1> <n2> <v1>...<vn>
Hex: 1B 5A <n1> <n2> <v1>...<vn>
BASIC: CHR$(27);"Z<nl><n2><vl>...<vn>";
121
5000 Series Programmer's Manual